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Dry lining or drywall is used to describe a technique of covering a structure with a dry product which is attached to the structure. Traditionally surfaces were covered with a wet sand and cement render or plaster. Dry lining now refers mainly to covering internal walls with plasterboard with the plasterboard either stuck on the walls or fixed to a timber or steel frame which is attached to the walls. Dry...

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Finding and sealing a crack on the exterior of a house will help to reduce air infiltration and exfiltration on the inside. Because of the large size of plywood and OSB sheets, there are relatively fewer seams in the sheathing on newer homes. And the use of products like house wrap on new construction has further reduced air infiltration (see Fig.1). Consequently most new homes are more airtight...

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The exterior of a home can be thought of as an "envelope" or "shell." Sealing the envelope or shell against air infiltration (air entering the house from the outside) and air exfiltration (air escaping from inside the house to the outside environment) helps reduce energy costs for central heating and air ventilation. Hence draft is also reduced. To test for leaks which are responsible for high...

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