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Foam in the ventilation space: do I need to trim it off?


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Have a look at this.

 Just about finished insulating between the rafters, and putting on the counter-battens. There are bits and bats of foam in the 50mm ventilation gap.

20180704_080422.thumb.jpg.9f1bda8fd7986b727daf65fbd250ccae.jpg

 

Do I need to trim the foam flush with the top of the PIR?

Thanks in advance.

Ian

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2 hours ago, Ian said:

@recoveringacademic

Quick question as I'm not familiar with the Nulok system that you'll be using for the slates. Do you need to ventilate the gap between the breather membrane and the u/s of the slates?

 

@Ian, @PeterStarck's answer is the one you need. 

And here's part of the explanation: the tiles have marks on them to ensure you leave an appropriate gap for ventilation

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5 hours ago, Onoff said:

What's the lifespan on the steel battens out of interest? Are they galvanised?

They are galvanised and when I did mine it was possible to get a 50 year guarantee on the whole roof.

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