Windows and doors

Windows

Manufacturers are not used to providing thermal performance data in a format suitable for inclusion in PHPP, so spend time reviewing the exact frame, glazing and spacer specification they provide for each window. This is usually easier for certified windows but still take care.

Once you have interpreted manufacturer information and put it into PHPP, we would recommend sending a copy back to the manufacturer for them to confirm the values you have taken.

When specifying airtightness for a building where the target is to achieve Passivhaus or EnerPHit certification, it is essential to specify the airtightness process as well as the airtightness target and the sealing materials and process to be...

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Some window components will not achieve the installed 0.85 W/m2K target and this may be acceptable as long as they are not adjacent to habitable areas where people are likely to spend significant time.

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For best thermal performance, position frames near the centre of the insulation line. Optimisation of such details in thermal bridging software is worthwhile. However, deep external reveals increase the solar shading which may or may not be...

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Whilst a number of sites have met the airtightness criteria whilst using sliding doors, their use needs careful consideration as the airtightness often degrades faster than a standard door due to wear and tear. This is particularly important if...

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When installing horizontal glass (rooflights) the glazing performance changes; this must be taken into account in the U-value. For example, glazing with a stated U-value of 0.60 W/m2K should be entered as 0.90 W/m2K in PHPP when it is installed...

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Triple glazing gives the best energy balance, even in the UK climate, and is needed to meet comfort requirements and to avoid condensation and mould at the edges.

The glazing g-value (Solar Factor) refers to the fraction of solar heat that...

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Generally frames perform worse than glazing so small windows, or those with lots of mullions and transoms should be minimised.

When picking a window frame, the dimensions should always be considered as well as frame U-value. While it can...

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The performance of sealed glazing units varies with thickness of the frame. A good frame should have a rebate >48mm to allow sufficient glazing options. For triple glazing, 18-20mm cavities are optimum for Argon – 16mm or less gives inferior...

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Passivhaus certification of windows requires no airtightness testing to be undertaken, so tread with care. Whilst most certified windows have got a precedent of meeting the airtightness standard, it is recommended to ensure the manufacturer...

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Some manufacturers are willing to provide support, for example, help with airtightness detailing, installation psi-value calculations and site visits.

Another reason to get manufacturers involved early is to ensure that proposed window...

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Munster Joinery supplied windows for a social housing development on behalf of Orbit Heart of England Housing Association. The Coventry Eco House development consisted of two units built to the Passivhaus standard using the Beattie Passive system.

Munster Joinery were able to supply...

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