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Be sure to install a vapour barrier especially if London is a damp place.
We have a heavy plastic vapour barrier over the joists. We rented a machine from Home Depot that blew insulation over top of that, to about 12 inches deep.
The province and federal governments both had rebates for upgrading insulation, so it really cost nothing and it did reduce our heating bill, more than windows.
Minor tip- get gaskets for doors and get insulation for your switch plates and outlet covers.These really help and are dirt cheap.Anytime we replace a window we blow insulation into the wall. Some people blow insulation into walls by drilling holes into the drywall at the top. This also makes a huge reduction in outside noise.
davidual
Sumo
We're about to move to a 30s house that basically has no loft insulation at all. Figure I can fit it myself, how hard can it be, but I'm a bit worried about the stuff selling out now. Even on Wickes right now the first items on the product page and have 70+ in the last 48 hours.