Windows and doors: Watchpoints

Nearly all window suppliers and many door suppliers will insist on coming to site to measure the openings directlyThe reason is that more often than not the built opening size is slightly larger or smaller than the construction drawings. It is important that a sufficient gap is left to allow for specialist airtightness foam to be applied to help prevent any gaps.

If the frame fit is too neat it may prove difficult to do this. Bonding the airtight membrane to the windows and external doors is also an important and time consuming task which requires a lot of care. It is probably, therefore, a task best left to someone other than the installation team unless they can be supervised very closely by an experienced personAfter all, it won’t matter how well a product scores in the various tests, if the installation is poor.