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When using sarking felt do I need to ventilate the roof?

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When using sarking felt do I need to ventilate the roof?

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Yes, when sarking felt is used as the waterproofing layer on a pitched roof, you would need to ventilate the roof. You would need a 50mm ventilated air space between the insulation (installed between the rafters) and the top of the timber rafters.

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