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Can any one tell me the correct way double glazed windows should be fitted? Ie. (1) should the cavity under the window be sealed off before the window is fitted. (2) Should the window be fitted on a bed of mortar/cement? (3) At what points should the frame be screwed to the wall (side , top...

From my understanding expanding foam is the answer. If the foam willcome in contact with the double glazed frame, then you should use a window foam filler, so that is does not react with the frame. Use a search engine to Check out foam fillers types and usages