In a warm pitched roof construction the thermal Insulation is placed in the rafter line. The position of the Insulation can be wholly above or partially between and above the rafter; alternatively it can be positioned between the rafters or partially between and below the rafter.
If the insulation thickness only partially fills the rafter depth the vapour open / permeable underlay should be draped over the rafter in the traditional method. The underlay should not be allowed to touch the surface of the Insulation and a clear air space ensured between the membrane and insulation. Should the vapour permeable underlay be laid directly on top of the insulation in a fully supported situation it should be secured by counter battens to allow water to drain effectively across the membrane surface and from the roof.
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