FAQ: The abbreviation FENSA stands for FENESTRATION - SELF ASSESSMENT.
The uk dictionary definition of the word fenestral or fenestrate is " belonging to or like a window" The word fenestration is "the arrangement of windows in a building". FENSA is used by double glazing uk trade companies to certify that their replacement windows and doors installed comply with Building Regulations Document L (and more), actually checking av. 1% of all replacement windows installations.
Did You Know?
Sliding patio doors - common problems which can be rectified:
Sealed units that have misted up inside can be replaced, read about that here
If the draught-proofing pile strip becomes detached it is usually impossible to replace as it is factory fitted into channels before the frames are assembled.
Additional top and bottom locks are highly recommended for older doors with only a basic lock.
If the hardwood frames has rotted it is usually not economical to replace just that, and maybe it is time the old door was replaced with a nice new white PVC-U set. This should be a worthwhile expense as security and insulation should be vastly improved, and no more painting or staining.