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Do I need to put an underlay inside the roof if I have Klober underlay outside?


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A apex roof has been constructed with Klober breathable underlay that has been fixed to the outside of the roof.

Do I need another layer inside the rafters between the insulation and the sarking, or vapor control layer?

1973909030_apexroof.thumb.jpg.289dfcd78d7d5a0be80487c8d50e3a38.jpg

The roof will be fitted with 150mm thick insulation (Ecotherm PIR, or Actis Hybris)

Note the roof is built on a 800mm thick cottage rock wall (granite)

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