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Exterior Wall System



Draught stripping

Professionally fitted draught-stripping is one of the most effective methods of reducing air infiltration and therefore heat loss. Most companies replace the existing staff bead and parting bead with a section of their own, identical in size and shape but incorporating rubber, polypropylene or nylon brush seals, and capable of being painted. Sashes are taken out, grooves cut in the hidden edges and similar seals inserted, so that when they are replaced there is a good windproof seal filling all the previous gaps. Most companies will, at the same time, overhaul the windows, replacing sash cords and adjusting weights where necessary, and replacing missing or broken putty. DIY draught-proofing (not nearly as effective as contractor-installed measures) will pay for itself in one or two years; professional work will pay for itself in from five to 25 years, depending on complexity. This compares with a repayment time of 60-100 years for double glazing. . .

Where draught-proofing measures have been carried out, special care is needed when painting the windows. Brush-type draught-strips in particular will be ruined once clogged with paint, and although paints will not stick easily to rubber, some solvent paint removers attack plastic.

Wrightson, David. The Conservation and Renewal of Timber Windows, Public Information Leaflet, Cathedral Communications, Wiltshire, England [PDF file]







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