replace slate roof

15 Aug 2012
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United Kingdom
I am about to replace my slate roof and have a couple of questions:the roof has never had a membrane and I intend to strip off the slates and put down a good breather membrane. There is fibre glass insulation between the rafters ( done from below when the attic was converted). If I'm putting down a breather membrane can I leave the fibre glass insulation or am I better off replacing with maybe 50mm celotex insulation board to leave a 25mm air gap ?

Also there is big price difference between lead for the valleys or GRP valleys. I really want to do the job as best I can so should I use lead ? TIA
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I would use a grip valley rather than lead, it is easier for use to use and cost you less.
I would use celotex or kingspan.
To save money on your insulation I would look out for seconds quality boards. These usually have flaws on the writing on the boards or minor dents but if they are hidden who cares?

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