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u value rafters rockwool

  1. A

    Insulation Methods

    New wrap around side extension with: Pitched roof (breathable felt on rafters /standard ceilings joists) Double skin/ insulated wall/new floor etc etc What are my options as regards insulation to the 'attic' / void ? will have inspection hatch , storage very limited if at all foam backed...
    • anorakdiyer71
    • Thread
    • fibre glass insulation insulation ceiling mineral wool rockwool u value rafters rockwool uvalue
    • Replies: 5
    • Forum: Building
  2. P

    U Value for a pitch roof

    Hello All, I'm trying to work out the U value requirement of a pitched roof. Its an extension roof and Building Regs require a .16 U value at the ceiling level. This is the roof makeup thus far Clay Tiles 20mm Breather membrane (0.1 mm) Air layer/battens 30mm Rafters 200 mm To get to a...
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