yacobwood Posted December 5, 2023 Share Posted December 5, 2023 I am currently designing my garden office but due to the weird shape of the back following my garden border, im having difficulty figuring out the roof. The building will be 2.5m high due to UK planning restrictions so a flat roof is needed. From front to back I have a drop of 197mm. As far as I know, due to the two sides having a different slope, I will need a change of roof angle at some point. The difficulty im having is designing the roof ridge and rafter and how/where to connect them. Any help would be greatly appreciated!! Sketchup model for anyone wating a closer look....https://drive.google.com/file/d/14BFrgfc2J_oMTAQqMfvo_LYdFgN0Gkck/view?usp=drive_link Link to comment Share on other sites More sharing options...
Russdl Posted December 5, 2023 Share Posted December 5, 2023 That’s not a dissimilar shape to the garage I’m building, height restricted in the same way you are as we are using permitted development rights. We’ve used EPDM, 8m x 8m with a big triangle to cut off due to the shape of the garage. (It is a long way from being finished though). Our roof pitch is very shallow and single pitch. Why have you gone for different slopes across the roof? Link to comment Share on other sites More sharing options...
joe90 Posted December 5, 2023 Share Posted December 5, 2023 (edited) Having different slopes complicates it, why not have the same slope as the short side and the back wall will slope slightly down to the pointy corner. If not, what’s your decking material.? If you want different slopes as per your drawing then a 15mm ply sheet fixed to rafters will twist enough to cope with the different angles then felt/GRP/EPDM. Edited December 5, 2023 by joe90 Link to comment Share on other sites More sharing options...
Conor Posted December 5, 2023 Share Posted December 5, 2023 (edited) Have the fall all heading to the back using firring strips on top of the roof rafters. Easy. Edited December 5, 2023 by Conor Link to comment Share on other sites More sharing options...
yacobwood Posted December 5, 2023 Author Share Posted December 5, 2023 53 minutes ago, joe90 said: Having different slopes complicates it, why not have the same slope as the short side and the back wall will slope slightly down to the pointy corner. If not, what’s your decking material.? If you want different slopes as per your drawing then a 15mm ply sheet fixed to rafters will twist enough to cope with the different angles then felt/GRP/EPDM. Somthing like this? Link to comment Share on other sites More sharing options...
joe90 Posted December 5, 2023 Share Posted December 5, 2023 (edited) Yes, that end wall (opposite doors) will be shorter in height at the point than where it joins the side to the right to maintain an equal slope over the whole roof (shame I can’t do CAD 🤷♂️) Edited December 5, 2023 by joe90 1 Link to comment Share on other sites More sharing options...
yacobwood Posted December 5, 2023 Author Share Posted December 5, 2023 Thank you. I didnt think of this layout. 1 Link to comment Share on other sites More sharing options...
yacobwood Posted December 8, 2023 Author Share Posted December 8, 2023 Thanks for the help. This is the stage ive got to with it now 1 Link to comment Share on other sites More sharing options...
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