Surveying - Replacement Window & Doorsets
General : Surveyor
Manufacturing Sizes: Due to temperature fluctuations, PVCu windows and
doors can expand and contract. This needs to be taken into account when
calculating the finished frame size in relation to the aperture. The table below
highlights the recommended deductions for the width and height of a frame.
Recommended Deduction for Width and Height of Structural Opening.
Material: Up to 1.5m From 1.5m to 3.0m From 3.0m to 4.5m From 4.5m
GRP 5 10 15 15
PVC-U : White 10 10 15 20
PVC-U : Non White 15 15 22 28
Timber 10 10 10 15
Steel 8 10 12 15
Aluminium 10 10 15 20
All dimensions in millimetres (mm)
These deductions are from the TOTAL width and height, and not “per side”.
The gap (tolerances) required for effective polyurethane foam fixing at the head is 10 - 15mm.
NOTE: When the overall width or height exceeds 3.0m, intermediate expansion joints may be
required.
NOTE: BS7412 limits window sizes up to 3.0m only.
Issue: 2 (January 2008) 10
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