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 leaks 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.