How do I bathroom / kitchen / extension? etc.

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dbr

Got the 140kg rooflight on today with a little help from @cjr

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ectoplasmosis in reply to @dbr

Beautiful!

May I ask what the specs of the exposed timber and flat roof build-up are?

We are looking to do something very similar with our ground floor extension, would be great to know the ins and outs as we're not using an architect...

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dbr in reply to @ectoplasmosis

Neither are we! I've designed it, between me, building control and the builder we've worked out the spec.

GRP roof membrane
OSB
Firings
OSB
150mm PIR
18mm MR MDF
Joists

Works out to 0.15 W/m²K. You'll have to find a structural engineer to spec the joists based on span, spacing and load.

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