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I’m at the early stages of planning a garden room self-build – I consider myself a competent DIYer, but have never attempted something on this scale, so hoping to get some advice here! The plan is for an 8m x 4m timber building (built on a contrete base), with an internal wall separating into a games room (5m x 4m), and office (3m x 4m). By the time wall thicknesses are taken into account, the internal floor space will be under 30m2 which should exempt us from building regs.
I’ve been watching lots of Youtube videos of garden room self builds and playing about with some preliminary designs for the structure (to try and get some approximate cost estimates!). I am planning on using 47 x 100mm timbers for the walls (at 400mm centres) with 47 x 200mm joists for the roof (a flat roof sloping front to back). Weighing up the pros and cons of cold versus warm roof construction, I think a warm roof would be the better option (the building will be more than 2 metres from any boundary, so we aren’t restricted to 2.5 metres height). Within the front wall, we are hoping to have sliding patio doors (not bifold) for the larger of the two rooms. My main question is about the required lintel for these patio doors. Hypothetically speaking, if we had 3 metre wide doors, would a wooden lintel constructed from two lengths of 47 x 200mm timber bolted together be adequate to support a warm roof? Or would a flitch steel be required (or something else?!)? If anyone could point me towards any website(s) that will help with the calculation on patio door width versus lintel construction that would be extremely helpful! Thanks in advance!
I’ve been watching lots of Youtube videos of garden room self builds and playing about with some preliminary designs for the structure (to try and get some approximate cost estimates!). I am planning on using 47 x 100mm timbers for the walls (at 400mm centres) with 47 x 200mm joists for the roof (a flat roof sloping front to back). Weighing up the pros and cons of cold versus warm roof construction, I think a warm roof would be the better option (the building will be more than 2 metres from any boundary, so we aren’t restricted to 2.5 metres height). Within the front wall, we are hoping to have sliding patio doors (not bifold) for the larger of the two rooms. My main question is about the required lintel for these patio doors. Hypothetically speaking, if we had 3 metre wide doors, would a wooden lintel constructed from two lengths of 47 x 200mm timber bolted together be adequate to support a warm roof? Or would a flitch steel be required (or something else?!)? If anyone could point me towards any website(s) that will help with the calculation on patio door width versus lintel construction that would be extremely helpful! Thanks in advance!
