Thursday, August 6, 2009
If you notice a draft through an outside wall electrical outlet, it must be sealed. (Some inside wall outlets can also provide leakage paths, so check them as well.) Turn off the power to the outlet by turning off the circuit breaker or removing the fuse. Check to make sure the power is disconnected by turning on a lamp.
You will obtain a better seal if you caulk the gasket before installation. Place child safety plugs in seldom-used outlets. Some foam pads come with a gasket that fits on the safety plug.
If you are installing an electrical outlet during a renovation, get a good seal by placing it in a special plastic box that is available from many hardware or electrical supply stores. Caulk the penetration for the wire, and seal the new air and vapour barrier to the edge of the box.
Planners and roofing companies still face a big challenge in finding an inexpensive, timesaving and durable sealing system for flat roofs on industrial buildings. Particular problems are presented by roofs with complex shapes and a large number of breakthroughs, such as airshafts and pipe supports. It is hard to get around these problems using conventional roof sheeting, especially as it is usually around the breakthroughs that the roof begins to leak.
There are number of materials that are used to provide an air barrier at different locations in the house. These include specialty gaskets and tapes, as well as sheet materials such as polyethylene, spun-bonded olefin, rigid insulation, drywall, plywood and sheet metal. Installation techniques are critical when using sheet materials as an air barrier. All edges, seams and penetrations in the sheets must be sealed.
Liquid Roof Coatings