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Hi. I have new upvc windows & doors to fit in my new extension with 150mm deep external sills. The BCO has said he wants them fitted in the middle of insulated cavity closer ( screwed into thin plastic?!! ). Obviously if I fit them there the external sill will not over hang and be sitting on the external leaf. Cavity wall is 100mm block and 100mm cavity. I have looked at window sills and the deepest I can find is 180mm even with this it's at best going to overhang 10mm which would be subsequently covered by the render.
The only solution I can think of is to by some 9mm upvc window board and sit the window on that creating 2 sills and maybe problems with rain trying to penetrate between the 2 sills.
This must be a common building regs issue? Any ideas? Thanks
The only solution I can think of is to by some 9mm upvc window board and sit the window on that creating 2 sills and maybe problems with rain trying to penetrate between the 2 sills.
This must be a common building regs issue? Any ideas? Thanks
