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Passive house and the role of high-performance windows and doors

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Interest in passive house construction continues to grow across Ireland, driven by rising energy costs, tighter building standards, and a broader shift towards sustainable living. For homeowners planning a new build or a deep retrofit, the passive house standard represents one of the most rigorous and effective approaches to energy efficiency available. But achieving certification depends on every element of the building envelope working together, and windows and doors are among the most critical components in that equation.

What is the passive house standard?

Warm living room with Omnia Flush french doors

The passive house standard, originally developed by the Passivhaus Institut in Darmstadt, Germany, is a voluntary building performance standard focused on minimising energy consumption while maintaining exceptional indoor comfort. It is not a building type or a style of architecture. It is a measurable set of performance criteria that any building can be designed to meet.

To achieve those criteria, a building must satisfy three core requirements. Annual heating and cooling demand must not exceed 15 kWh/m² of treated floor area. The building must achieve an airtightness result of no more than 0.6 air changes per hour at 50 pascals of pressure, as measured by a blower door test. Total primary energy consumption, including heating, hot water, and electricity, must remain within 120 kWh/m² per year.

These targets are significantly more demanding than Ireland’s current Nearly Zero Energy Building (NZEB) regulations under Technical Guidance Document Part L, and represent up to a 90% reduction in heating energy compared to a typical Irish home. With the EU requirement for all new buildings to be zero-emission from 2030, the gap between standard regulations and the passive house standard is expected to narrow considerably in the coming years.

Why windows and doors are so important in passive house design

In any building, windows and doors represent the thinnest and most thermally vulnerable parts of the envelope. In a passive house, where every element must perform to an exceptionally high standard, the specification and installation of glazing becomes even more consequential.

Passive house windows must typically achieve a whole-window U-value of 0.80 W/m²K or lower. This is well beyond the minimum requirements of Irish building regulations, which currently allow replacement windows with U-values of up to 1.6 W/m²K. To reach these levels, triple glazing is effectively essential, combined with low-emissivity coatings, argon or krypton gas filling, warm-edge spacer bars, and thermally broken or multi-chambered frames.

However, the window itself is only part of the picture. Installation quality plays an equally important role. Even the highest-performing unit will underperform if junctions between the frame and wall are poorly sealed, if thermal bridging occurs around the opening, or if airtightness is compromised during fitting. In passive house construction, installation detailing is as important as product specification.

Airtightness and thermal bridging

Airtightness is one of the defining characteristics of a passive house. The 0.6 ACH target is extremely stringent, and achieving it requires meticulous attention to every joint, junction, and penetration in the building envelope. Windows and doors are among the most common points where airtightness can be compromised.

Proper sealing around window and door frames, using tapes, membranes, and compression seals appropriate to the substrate, is essential. The interface between frame and wall must be designed to maintain both an airtight and a weathertight barrier, without creating cold bridges that could lead to condensation or heat loss. The Passive House Association of Ireland provides guidance on best practice detailing for Irish construction methods.

Thermal bridging at window junctions is another area that requires careful detailing. In passive house design, windows are often positioned within the insulation zone of the wall rather than flush with the outer face, helping to maintain a continuous thermal envelope and reduce heat loss at the frame edge.

How Fairco products support passive house performance

Fairco’s window and door systems are engineered with thermal performance, airtightness, and long-term durability as core design priorities. While the passive house standard places demands on the entire building, Fairco products offer several attributes that align with these requirements.

Fairco OMNIA Flush and Performance uPVC ranges are available with triple-glazed units, achieving U-values as low as 0.75 W/m²K in the case of OMNIA Flush, comfortably within passive house territory. These systems combine insulated multi-chambered profiles, advanced gasket sealing, and precision-manufactured frames to deliver consistent thermal and airtight performance.

Fairco’s aluminium systems also incorporate thermally broken profiles, supporting low U-values while allowing for slimmer sightlines and larger glazed areas. This is an important consideration in passive house projects where solar gain and daylight are part of the energy strategy.

Because Fairco controls design, manufacture, and installation, performance is managed as a complete system rather than a collection of individual components. This is particularly important for passive house projects, where the gap between designed and actual performance must be minimised.

Ireland’s climate advantage

Ireland’s mild maritime climate is well-suited to passive house construction. Winter temperatures rarely drop to extremes, which means achieving the 15 kWh/m² heating target is more achievable here than in colder northern European countries. Ireland also benefits from useful levels of solar gain, even during winter months, which can be harnessed through carefully oriented glazing.

The Passive House Association of Ireland notes that the country has one of the largest pools of trained passive house designers and tradespeople in Europe relative to its population. Combined with increasing regulatory momentum and the SEAI’s continued support for energy efficiency upgrades, passive house construction is expected to become an increasingly mainstream approach in the years ahead.

Planning your passive house project

If you are considering building to the passive house standard, early engagement with experienced suppliers is essential. Windows and doors should be specified as part of the overall energy model, not selected as an afterthought. Factors including frame material, glazing specification, installation methodology, and orientation all influence the final energy performance of the building.

Fairco’s team can advise on product selection, U-value calculations, and installation approaches that support passive house certification. Whether you are working with an architect, an energy consultant, or managing a self-build, expert guidance on glazing and door specification helps ensure the building performs as intended.

Contact Fairco to discuss your passive house project, or explore our window ranges to understand the performance options available.

 

Do you need planning permission for new or replacement windows in Ireland?

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Upgrading or replacing your windows is one of the most effective ways to improve comfort, energy efficiency, and property value. But before you start, it’s essential to understand what the law says about planning permission and building regulations.

Most window replacements qualify as exempted developments, meaning you don’t need planning permission. However, there are clear exceptions, especially if your home is listed in a conservation area, or if you’re changing the appearance of your property.

At Fairco, our products and installation process are designed with full compliance in mind, helping homeowners modernise efficiently and legally.

When planning permission is not required

In the majority of cases, replacing existing windows with similar ones doesn’t require planning permission. According to Planning Leaflet 8: A Guide to Doing Work Around the House, such work is considered exempted development under Irish planning law.

This exemption generally applies when:

  • You are replacing windows of the same size, shape, and appearance.
  • The work does not materially alter the external look of your home.
  • The replacement does not affect protected or designated structures.

These exemptions are outlined under the Planning and Development Act and accompanying Regulations available via gov.ie.

If you’re unsure whether your plans qualify, you can request a Section 5 Declaration from your local planning authority. This provides a formal decision confirming if your project counts as exempt development.

 

When you do need planning permission

While many upgrades are exempt, several scenarios require planning consent or special permissions:

  1. Adding or altering window openings
    If you’re adding new windows, changing window size, or installing features like bay windows that project outward, you will likely need permission. Such works are considered to materially alter the structure’s external appearance.
  1. Protected and conservation properties
    For protected structures or homes in architectural conservation areas, even replacing existing windows often requires formal consent. This ensures the visual character of heritage areas remains intact.
  1. Special local restrictions
    Some local councils enforce special restrictions, removing permitted development rights. If your property is covered by one, changes that would normally be exempt, such as replacing windows, may require permission.
  1. Converting windows into doors
    Transforming a window opening into a door typically demands planning approval, as this alters both the façade and structure.
  2. Proximity to boundaries and privacy concerns
    Certain distance and height rules apply, particularly for upper-floor windows. For example, Wexford County Council’s exempted development guide notes that upper-storey windows must be at least 11 m from a boundary line. Local authorities may interpret this differently, so always confirm locally.

Building regulations still apply to all replacements

Even when planning permission isn’t needed, Building Regulations still apply to every window installation. These ensure safety, structural integrity, and energy efficiency.

The most relevant requirements come from Technical Guidance Document Part L, which deals with the conservation of fuel and energy. Windows must meet minimum performance standards, including:

  • U-values: Replacement windows must achieve specific thermal performance targets to limit heat loss.
  • Ventilation: Modern regulations require adequate airflow. If your old windows didn’t include trickle vents, new ones must.
  • Safety glazing: Toughened or laminated safety glass must be used near doors, low sills, or high-traffic areas.
  • Compliance documentation: Installers should provide certification confirming adherence to regulations.

You can review the official standards in Technical Guidance Document L.

How Fairco ensures full compliance

At Fairco, compliance isn’t an afterthought; it’s built into everything we do. Our process ensures your upgrade meets both planning and building regulation requirements from the outset.

  • Design assessment: We evaluate whether your project falls under exempt development and design replacements that align with the existing structure.
  • Aesthetic continuity: Our systems replicate original proportions and finishes, reducing the likelihood of planning complications.
  • Certified performance: All Fairco windows are engineered to exceed Irish energy and safety standards, achieving low U-values and high durability.
  • Regulation-ready installation: Every installation is completed by trained professionals following Technical Guidance Documents, ensuring peace of mind and legal compliance.

Heritage Sash, designed for conservation

Fairco’s Heritage Sash windows are ideally suited for conservation areas and protected structures because they are designed to respect the architectural character while meeting modern performance standards. Our sash profiles, slim rails, and run-through horns mirror traditional design details, which aligns with the approach set out in the Architectural Heritage Protection Guidelines for Planning Authorities guidance that emphasises minimal intervention and the retention of original proportions and features in conservation areas. Under these guidelines, any alteration to windows in Architectural Conservation Areas (ACAs) or protected structures must preserve the “character and special interest” of these buildings. By combining faithful aesthetic replication with energy-efficient glass, secure frames, and precise installation, Heritage Sash offers a balance: you maintain regulatory compliance while achieving thermal performance and durability.

Read more about Fairco Heritage Sash in this blog or explore the range here.

The Fairco difference

For most Irish homes, replacing like-for-like windows doesn’t require planning permission. However, once you alter window dimensions, introduce new openings, or work on protected structures, permission or heritage consent becomes necessary. Regardless of planning requirements, Building Regulations always apply.

Fairco helps homeowners navigate this process confidently, combining compliance expertise with premium energy-efficient window systems that enhance performance, comfort, and value.

Thinking about upgrading? Contact Fairco today for expert advice on compliant, high-performance window replacements.

Window and door market trends for 2026

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Upgrading your windows and doors is a significant investment, and understanding market trends can help you make informed decisions. The 2025 window and door market was shaped by evolving homeowner preferences, stricter energy standards, and innovations in design and materials. Insights from industry research show which styles and technologies are becoming standard, and which offer long-term value for comfort, energy efficiency, and aesthetics.

By understanding these trends, homeowners can plan upgrades for 2026 that balance style, performance, and durability while meeting current regulations.

Materials driving change

Aluminium continues to grow in popularity due to its strength, slim profiles, and versatility in large windows and sliding doors. This material allows homeowners to create bright, open spaces with minimal frame interference. At the same time, uPVC remains widely used for its affordability, thermal performance, and low maintenance requirements, making it a reliable choice for many properties.

While modern aluminium and uPVC solutions dominate in new builds, period homes continue to demand timber and sash windows. Modern engineered composite options meet conservation and energy standards while maintaining authenticity. Composite frames deliver high performance while retaining the traditional look that period and heritage homes require, allowing homeowners to comply with conservation requirements without sacrificing thermal efficiency.

Design trends: light, open, and modern

Modern homeowners are prioritising designs that maximise natural light and visual connectivity between indoor and outdoor spaces. Large sliding doors, bifolds, and fixed light units are increasingly preferred in contemporary living areas and extensions. Even within period properties, carefully specified modern glazing can enhance natural light while respecting the property’s character.

Energy efficiency remains a priority

Energy efficient anthracite OMNIA window and door

Energy performance continues to be a critical factor for homeowners, driven by both regulatory requirements and the desire to reduce heating costs. In Ireland, windows and doors must meet strict U-value standards, and low thermal bridging is essential for long-term comfort. Triple glazing, thermally broken aluminium, and airtight installation are increasingly adopted to minimise heat loss and prevent condensation.

Fairco products, such as the Heritage Sash and OMNIA Flush ranges, combine high-performance energy efficiency with design flexibility suitable for both contemporary and heritage homes.

Smart technology and sustainability

Beyond material and design, technology and sustainability are influencing homeowner choices. Integrated smart glass, automated ventilation, and energy-saving features are gaining traction, alongside products with sustainable sourcing, recycled content, and certifications indicating lower environmental impact.

Implications for homeowners

Understanding these trends helps homeowners make decisions that balance aesthetics, performance, and longevity. Material choice, energy efficiency, and design integration all affect comfort, running costs, and property value. Homeowners should consider both contemporary and heritage-compatible options, ensuring their windows and doors deliver long-term benefits.

Conclusion

The 2025 window and door market reflects an industry evolving with homeowner expectations: efficiency, style, and durability. Choosing products that combine performance with appropriate aesthetics improves comfort, reduces energy costs, and protects property value.

Explore Fairco’s range of high-performance windows and doors to find solutions that meet modern requirements, whether for contemporary or period properties.

The right window opening style for each room

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Choosing new windows involves more than selecting a frame colour or glazing specification. The way a window opens has a direct impact on ventilation, ease of use, safety, cleaning, and how each room functions day to day. A well-chosen opening style improves comfort and usability, while a poor choice can limit airflow, complicate cleaning, or restrict furniture layouts.

This guide explains the most common window opening styles used in Irish homes and outlines where each performs best, helping you specify solutions that suit both the space and how it is used.

Why window opening style matters

Different rooms place different demands on windows. Kitchens and bathrooms need effective ventilation to manage moisture. Bedrooms must balance airflow with safety and emergency egress. Living spaces often prioritise light, views, and uninterrupted openings. The right opening style supports these needs while maintaining thermal performance and compliance with building regulations.

Tilt and turn windows

Tilt and turn windows are one of the most versatile opening styles available. They open in two ways: a tilt function from the top for controlled ventilation, and a full inward turn for maximum airflow and easy cleaning.

Advantages: Excellent ventilation control, easy internal cleaning, good airtightness when closed, and suitable for upper floors. The tilt position allows safe background ventilation without fully opening the window.

Considerations: They require internal clearance to open fully, which may affect furniture placement.

Best suited to: Bedrooms, living rooms, home offices, and apartments, particularly on upper floors.

Choice of option: Fairco Aluminium, Fairco Preformance uPVC , Fairco OMNIA Flush

Casement windows

Casement windows are hinged at the side and open outward, typically using a handle and friction hinges. They remain one of the most common window styles in Irish housing.

Advantages: Simple operation, good ventilation, strong weather sealing, and compatibility with a wide range of architectural styles.

Considerations: External opening can be affected by wind exposure and may limit use near walkways or tight boundaries.

Best suited to: Living rooms, bedrooms, and general-purpose spaces in both modern and traditional homes.

Choice of option: Fairco Aluminium, Fairco Preformance uPVC 

Awning windows

Awning windows are top-hinged and open outward from the bottom, creating a protective canopy effect.

Advantages: Effective ventilation even during light rain, good security due to limited opening size, and suitability for higher-level installations.

Considerations: Limited opening area compared to casement or tilt and turn styles.

Best suited to: Bathrooms, kitchens, utility rooms, and spaces where privacy and controlled ventilation are priorities.

Choice of option: Fairco Aluminium, Fairco Preformance uPVC 

Fixed (picture) windows

Alu-Clad Tilt and Turn Windows

Fixed windows do not open and are designed purely to admit light and frame views.

Advantages: Excellent thermal performance due to the absence of opening hardware, clean sightlines, and maximum glazed area.

Considerations: No ventilation, so they must be paired with opening windows elsewhere in the room.

Best suited to: Living rooms, stairwells, feature elevations, and spaces where light and views are prioritised over ventilation.

Choice of option: Fairco Aluminium, Fairco Preformance uPVC 

Sliding windows

Sliding windows operate by moving one pane horizontally past another. They are often associated with contemporary designs and limited external space.

Advantages: No inward or outward swing, making them ideal where space is restricted. Simple operation and clean aesthetics.

Considerations: Typically offer less airtightness and ventilation area than other opening styles.

Best suited to: Kitchens, modern living spaces, and locations adjacent to patios or walkways.

Choice of option: Fairco Aluminium, Fairco Preformance uPVC 

Flush windows

Flush windows sit level with the external frame when closed, creating a clean, flat appearance. They can be configured as casement or tilt and turn openings.

Advantages: Refined aesthetics, suitability for both contemporary and heritage-inspired designs, and compatibility with high thermal performance standards.

Considerations: Opening style depends on configuration, so early specification is important.

Best suited to: Living rooms, bedrooms, and front elevations where appearance is a priority.

Choice of option: Fairco OMNIA Flush range

Sash windows

Sash windows open vertically, traditionally using a sliding mechanism with one or two moving panels. While closely associated with period and heritage properties, modern sash windows are engineered to meet contemporary standards for energy efficiency, security, and ease of use.

Advantages: Excellent ventilation control through staggered openings, strong suitability for conservation areas, improved acoustic performance when modern glazing is specified, and minimal impact on internal or external space.

Considerations: Traditional aesthetics require careful proportioning and detailing, particularly in protected or historic settings.

Best suited to: Period homes, conservation areas, Georgian and Victorian terraces, and any elevation where architectural authenticity is required.

Choice of option: Fairco Sash, Fairco Heritage Sash

Room-by-room guidance

Kitchens: Casement or awning windows provide effective ventilation to manage heat and moisture. Sliding windows can work well where space is tight.

Bathrooms: Awning or tilt-and-turn windows allow controlled ventilation while maintaining privacy. Obscure glazing is commonly specified.

Bedrooms: Tilt and turn or casement windows balance ventilation, security, and emergency egress requirements.

Living rooms: A combination of fixed and opening windows maximises light while maintaining airflow. Flush or large casement styles are common.

Balancing performance, safety, and design

When specifying window opening styles, it is important to consider ventilation needs, cleaning access, child safety, escape requirements, and how the window interacts with furniture and circulation. No single style suits every room, which is why a mixed approach often delivers the best overall result.

Get expert guidance

Selecting the right opening style early in the design process ensures your windows support comfort, performance, and day-to-day living. Fairco’s window systems are available in a wide range of opening configurations, allowing each room to be tailored to its specific needs. Consult our design team to identify the most suitable solutions for your home.

Practical tips for a warmer, more energy efficient home.

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Upgrading your home with Fairco energy-efficient windows is one of the most effective ways to improve year-round comfort, reduce heat loss, and lower your overall energy costs. Modern glazing technology, precision engineering, and airtight installation all contribute to a more efficient home, but how you use and manage your windows day-to-day also plays an important role. With a few simple habits, you can maximise performance and enjoy the very best from your new Fairco installation.

Understanding how modern windows improve efficiency

Today’s high-performance windows do far more than simply close off the cold. Fairco products are crafted using advanced insulated glazing, multi-chambered frames, and airtight seals that work together to keep heat where it belongs – inside your home. This means your heating system doesn’t have to work as hard to maintain a comfortable temperature, particularly during colder months.

Unlike older windows, which often suffer from draughts, weak seals, or single glazing, modern units are engineered to minimise heat transfer. Gas-filled glazing, low-emissivity coatings and warm-edge spacer bars help reduce heat loss, while robust weather seals prevent cold air from entering and warm air from escaping. However, to get the most from these technologies, it’s helpful to understand how heat, ventilation, and daily routines all interact.

Everyday habits that boost energy efficiency

Even the most advanced windows perform best when supported by thoughtful daily habits. These simple routines can help reduce energy waste and maintain a more balanced indoor environment:

Promote natural airflow when needed.
Many Fairco windows include built-in trickle vents, allowing a steady, controlled flow of fresh air without opening the window itself. This helps maintain air quality while avoiding unnecessary heat loss.

Use Tilt & Turn features effectively.
If your home includes Tilt & Turn windows, the “tilt” setting is ideal for passive ventilation. It lets fresh air enter from the top of the sash while maintaining security and minimising heat loss.

Manage heat retention with curtains and blinds.
Closing curtains or blinds at night helps keep warmth inside by adding an additional layer of insulation. Opening them during the day allows natural sunlight to warm your interior spaces – a simple way to take advantage of passive solar gain.

Why ventilation matters as much as insulation

One of the most common misconceptions about energy efficiency is that a home should be sealed as tightly as possible. While airtight windows and doors are essential for preventing heat loss, good ventilation is equally important for maintaining a healthy, stable indoor climate.

A well-ventilated home:

  • Heats up more quickly because fresh air circulates more easily.
  • Keeps warmth for longer with fewer cold spots or damp pockets.
  • Reduces the risk of condensation, mould, and moisture damage.

Modern, energy-efficient homes rely on a balance between insulation and controlled ventilation. Trickle vents, tilt functions, and short bursts of daily window opening all help manage moisture and keep air moving without compromising warmth.

Long-Term Benefits You’ll Notice

Using your Fairco windows mindfully enhances daily comfort and supports long-term home performance. Over time, you can expect:

  • Lower energy consumption and improved heating efficiency.
  • Higher indoor comfort with fewer draughts or cold zones.
  • Healthier indoor air through better moisture and allergen control.
  • Greater overall durability as proper ventilation protects frames and interiors.

Combined with Fairco’s precision installation and high-performance design, these habits help ensure your home remains warm, comfortable, and efficient for years to come. If you are interested in finding out more about the Fairco difference, reach out to our experts! 

Understanding thermal bridging and how it impacts thermal performance

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When homeowners think about window performance, attention usually goes straight to glazing U-values. While glass performance is important, real-world heat loss is often driven by something less visible: thermal bridging. Around windows and doors, poorly designed frames or incorrect installation can create direct pathways for heat to escape, undermining the performance of even the best glazing.

In Ireland’s climate, thermal bridging doesn’t just increase energy demand. It raises the risk of internal surface condensation, mould growth, and long-term fabric damage. Understanding how thermal bridges form, and how they are mitigated, is essential for delivering genuine energy efficiency rather than headline performance figures.

 

What is thermal bridging?

Thermal bridge diagram

A thermal bridge occurs where a material with higher thermal conductivity allows heat to bypass insulation; it is a weak point in the building envelope where heat flows more easily from warm to cold areas.

The Irish Building Regulations recognise thermal bridging as a significant contributor to overall heat loss, which is why Part L requires designers and installers to consider junction performance, not just individual product U-values.

Where thermal bridges typically occur

Thermal bridges can be grouped into several broad types based on how and where heat escapes through the building fabric.

Repeating thermal bridges arise from regularly spaced elements that interrupt insulation, such as wall studs, joists, or metal wall ties. Because these elements occur frequently, their cumulative impact on heat loss can be significant.

Linear, or non-repeating, thermal bridges are commonly found around openings and junctions. These occur where insulation is incomplete or interrupted, for example, at window and door reveals, or where highly conductive materials pass through the insulation layer.

Geometrical thermal bridges occur at changes in building form, such as corners or junctions where walls, floors, and roofs meet. At these points, the external surface area is greater than the internal surface area, which increases the potential for heat loss.

Point thermal bridges are localised penetrations through the thermal envelope. Typical examples include fixings and fasteners, brackets for canopies or façades, flues passing through walls, or isolated steel elements that conduct heat through otherwise insulated areas.

 

How thermal bridging affects window performance

House under construction with installed Fairco windows

Increased heat loss

Thermal bridges allow heat to escape more rapidly than insulated areas, increasing heating demand and reducing overall energy efficiency. Even small linear thermal bridges around window perimeters can have a measurable impact on a home’s BER.

Condensation and mould risk

When internal surface temperatures drop below the dew point, moisture in the air condenses. Thermal bridges create colder internal surfaces around window reveals and frames, making them prime locations for condensation and, over time, black mould growth. This is a common issue in older installations where frames were not thermally broken or properly insulated.

Reduced real-world performance

A window may achieve an excellent centre-pane U-value in laboratory testing, yet perform poorly once installed if thermal bridging at the frame and junctions is not addressed. This performance gap explains why some homeowners experience draughts or cold spots despite investing in high-spec glazing.

Common sources of thermal bridging around windows and doors

Frame materials

Different frame materials conduct heat differently. Older aluminium frames without thermal breaks are particularly conductive, while poorly designed uPVC or timber frames with limited chambering can also underperform.

Modern high-performance frames reduce thermal bridging through:

  • Multi-chambered uPVC profiles
  • Thermally broken aluminium systems using polyamide barriers
  • Engineered timber sections with insulating cores
  • Glazing edge spacers

The spacer bar between panes of glass is a critical but often overlooked component. Traditional aluminium spacers create a linear thermal bridge around the perimeter of the glass.

Warm-edge spacers, typically made from composite or stainless steel materials, reduce heat flow at the glass edge and help maintain higher internal surface temperatures, lowering condensation risk.

Poor installation and exposed junctions

Even the best frames will underperform if installed incorrectly. Gaps, compressed insulation, or uninsulated reveals create continuous thermal bridges between the interior and exterior.

Installation detailing is therefore as important as product specification.

 

Proven strategies to reduce thermal bridging

High-performance insulated frames

Selecting frames designed with thermal breaks and insulating chambers is the first step. At Fairco, frame systems are engineered to minimise conductivity across the entire profile, not just at isolated points.

Warm-edge glazing technology

Specifying warm-edge spacers reduces perimeter heat loss and improves internal surface temperatures, particularly important in bedrooms, kitchens, and high-humidity spaces.

Proper installation and airtightness

Correct installation ensures the window sits within the insulation layer of the wall wherever possible. This reduces exposure of conductive materials and maintains continuity of insulation.

Airtight tapes and membranes further limit convective heat loss, ensuring the thermal performance achieved in testing is delivered on site.

Wraparound and reveal insulation

Insulating the window reveal and returning insulation around the frame significantly reduces linear thermal bridging. This approach is increasingly recommended under Irish building guidance to achieve compliance with Part L and to improve BER outcomes.

Thermal bridging, compliance, and long-term performance

Irish and EU building regulations are increasingly focused on whole-building performance rather than individual components. Addressing thermal bridging is essential for:

  • Meeting Part L conservation of energy requirements
  • Achieving accurate BER ratings
  • Reducing condensation-related defects and callbacks
  • Delivering long-term occupant comfort

Windows and doors that are designed, specified, and installed with thermal bridging in mind perform more consistently over their lifespan, protecting both the building fabric and the homeowner’s investment.

How Fairco approaches thermal bridging

Malahide Front of the house

At Fairco, thermal performance is treated as a system, not a single number. Our window and door solutions combine insulated frames, advanced glazing options, warm-edge spacers, and installation methods designed to reduce thermal bridging at every junction.

This integrated approach ensures that declared U-values translate into real-world energy efficiency, lower condensation risk, and long-term comfort for Irish homes.

Looking to improve real-world window performance? Explore Fairco’s high-performance window and door systems and see how careful design and installation make the difference.