Wondering if someone can tell me what a storm mould is on a window? I am getting quotes to replace my old timber windows (renovating them is a lot more expensive so I have found out) and I have had a few quotes from window companies, none of which have mentioned storm moulds. Then I had a builder quote me and he has included 'storm moulds' in his quote. Then today I received what I hope is now my last quote where the quote actually identifies storm moulds and their inclusion in the quote (they are not included in the cost). Just wondering what are the benefits and do I need them?
Many thanks in advance