Weatherstripping windows and doors. Calfeutrement de fenetres et des portes

Describes different types of weatherstrips and reports ageing and deformation test on strips and tests on air tightness and closing force. Concludes that tubular strips provided the highest degree of airtightness in both windows and doors, while angle strips were only slightly inferior in performance. Air leakage was considerably greater for strips of expanded and foam plastics and fibre strips. Tests on ageing properties indicated that special rubber mixtures such as silicone rubber and epdm were preferable to p.v.c. field investigation shows that in blocks of flats with natural ventilation, the air change rate could be cut, on average from 0.9 to 0.5 air changes per hour. NOTES The version in Bldg. Res. Prac. is a rather fuller version with more figures and information.