Roofing

Loft insulation between rafters

Anonymous user 1 March 2024 - 2.59 PM

Hi there - back once again, with another DIY dilemma for all you trusty traders :) We're purchasing a 1930's semi, with pitched roof, & looking to insulate the loft as much as possible The house has 3 sloping roof sides, appears unventilated (from what I can see), isn't membraned (ie- you can see the tiles between the rafter). Because there is nothing between the rafter & mother nature (aside from the small brown rectangular clay(?) tiles), then I thought it prudent to insulate between and directly under the rafters (2 layers in total) I wanted to ask you guys: 1) are there any building regs for doing this (as I can't find much), and if so will this need prior/post approval if I undertake it myself? 2) with no roof tile membrane, does that alter anything in terms of venting/condensation, etc (ie - do I leave bigger gaps between tiles & insulation boards, untaped joins between boards, etc) 3) are there any fixings used specially for the boards (I was just going to use screws with wide washers) 4) anything else we should consider - board thickness, brands, fitting, vents, etc Ps - we will eventually be venting the roof soffit/fascia, when we upgrade to upvc next year Many thanks for your time Mark