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I want to use it as a more functional gym and storage area so will be plaster boarding and finishing more like a conventional room as opposed to a shed. I probably will add some sort of heating to take the chill off in the winter months. The only downside of warm roof, is it not going to me...

Yep

It’s more of a room in the garden than wanting a garden in the room.

If I was starting from scratch I would definitely use firrings as that seems the easy option but as the wall structure is already built (the back is one block higher than the front to create a slope) I’m not going to interfere with that.

Oh yes cold roof is what I meant. Ok great thanks. I’ll go with 6 x 2 noggins if I decide to go with the 8 x 2 rafters then.

Sorry, I’m not sure what you mean? Im putting a vented soffit around the perimeter and from what I have researched for a warm roof there needs to be a 50mm ventilation gap above insulation before the OSB. So I was then thinking if the noggins (spaced at every 1500mm or so) are tight under the...

Ok thanks, that’s what I wanted to hear! Say I use 8 x 2 and putting 100mm celotex in between rafters but need to have a 50mm ventilation gap would that noggins have to be 6 x 2 to allow for continued ventilation. Am I right in thinking if the noggins were also 8 x 2 it would block the 50mm air...

I’m not fussed about daylight. Do you have any advise regarding the questions I asked at all?

Thanks for your reply stevie888 If I was to replace the whole thing what would you recommend? If I was starting again should I have added a steel / wooden beam / purlin through the centre under the roof structure for it all to sit on and if so what size would this be? Should I have used 8 or...

No not putting skylights in. What other info do you need specifying? I’m happy to put a purlin through the centre if required.

Hi, I’m ready to put a new roof on my garage that I want to turn into a more habitable garden room. Any structural guys on here that would know what size timbers will I need to use please? The largest span is 4.6m. It’ll be a could roof with 100mm (if that’s enough?) celotex in between...

Would the pier not then be in the middle of the room?

Thanks for getting back to me. I did consider repairing the existing roof with a beam jacked up some how but after inspecting that roof, it’s in quite a bad state so I’m going to strip all that off and start again with some new timbers. I could do with some advice on what timbers would be...

Hello, Im going to redo my shed roof as it is currently sagging in the middle and pooling therefor leaking under heavy rainfall. I’ll put a couple of images up of the current roof construction which is 6 x 2 with joist hangers off of a centre beam (2 x 6 x 2s bolted together). The span is...