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Blown cellouse

JackofAll
in Heat Insulation

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Anyone here who insulated at rafter level with blown cellouse not use a "flying batten"?used to avoid tenting of membrane on outside. Just wondering how important it is to use? Roofer has forgot to include it before slating.

We used wood fibre board on the outside of our frame/ roof, with blown cellulose as insulation underneath, then passiv OSB on the inside. 

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