Windows and doors
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.
It is not necessary to use certified windows as long as manufacturers can supply data to EN 10077 to fill in the ‘Components’ worksheet in PHPP. In particular, ask for separate frame U-values (head, cill and jamb); and glazing U-values need to...
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