Simplysimon Posted March 14, 2017 Share Posted March 14, 2017 have to say dee we wouldn't be allowed that make up, your 4x2 on the flat would need to be 2 x 6x2 on edge up here. why put a lintel in it's not doing anything? either side is going to be carrying the same weight as above the lintel. i see what you mean by the birdsmoth on the wall, seems strange to me, you put a support in then weaken the rafter by cutting a birdsmouth. i would suggest putting a strap hanger around the ends of the rafters when you cut them at birdsmouth and over the wallplate. simon Link to comment Share on other sites More sharing options...
Dee Posted March 15, 2017 Author Share Posted March 15, 2017 (edited) On 14/03/2017 at 18:21, Simplysimon said: have to say dee we wouldn't be allowed that make up, your 4x2 on the flat would need to be 2 x 6x2 on edge up here. why put a lintel in it's not doing anything? either side is going to be carrying the same weight as above the lintel. i see what you mean by the birdsmoth on the wall, seems strange to me, you put a support in then weaken the rafter by cutting a birdsmouth. i would suggest putting a strap hanger around the ends of the rafters when you cut them at birdsmouth and over the wallplate. simon The top timbers will be doubled up but I've run out and awaiting delivery of more on Thursday so will be 100x100... BI was happy with that. Also he suggested a lintel but I'm with you on that one so I've gone with two 50x175 on edge to keep him happy ? wWe bought the house with planning already in place by the previous owner. We modified the plans somewhat but as we have yet to have the project signed off I'm going with whatever the BI suggests! Excellent idea on the strap hanger... Picture please if you have one? Edited March 15, 2017 by Dee Link to comment Share on other sites More sharing options...
Dee Posted March 15, 2017 Author Share Posted March 15, 2017 22 hours ago, Dee said: Quick update with photos..... The old rafters are yet to be cut flush with the wall plate as per BRegs chaps suggestion. Discovered a chuffing big steel running exactly under where the front elevation sits so what you see in this picture all the weight will bare on the steel....? Link to comment Share on other sites More sharing options...
PeterW Posted March 15, 2017 Share Posted March 15, 2017 10 minutes ago, Dee said: Discovered a chuffing big steel running exactly under where the front elevation sits so what you see in this picture all the weight will bare on the steel....? Sometimes a quick design change pays dividends. We have moved our dormers back so they stand on the inner block skin. I may use a thermal block to reduce the thermal bridge (or just a well insulated timber wall) but it meant that the front wall of the dormer became load bearing and the cheek rafters only take half the load from the walls - greatly simplifies the calcs..! 1 Link to comment Share on other sites More sharing options...
Nickfromwales Posted March 15, 2017 Share Posted March 15, 2017 Yup. Another 'Dee mini-blog' and not looking too shabby either 1 Link to comment Share on other sites More sharing options...
Nickfromwales Posted March 15, 2017 Share Posted March 15, 2017 47 minutes ago, PeterW said: Sometimes a quick design change pays dividends. We have moved our dormers back so they stand on the inner block skin. I may use a thermal block to reduce the thermal bridge (or just a well insulated timber wall) but it meant that the front wall of the dormer became load bearing and the cheek rafters only take half the load from the walls - greatly simplifies the calcs..! Doubling up the joists and cantilevering is another. Need as structural engineer ( SE ) then though. Link to comment Share on other sites More sharing options...
Dee Posted March 17, 2017 Author Share Posted March 17, 2017 On 14/03/2017 at 09:42, Dee said: Quick update with photos..... The old rafters are yet to be cut flush with the wall plate as per BRegs chaps suggestion. Discovered a chuffing big steel running exactly under where the front elevation sits so what you see in this picture all the weight will bare on the steel....? Link to comment Share on other sites More sharing options...
Dee Posted March 17, 2017 Author Share Posted March 17, 2017 (edited) Brief update...the bones of the roof up in a day.. And not one duff cut! It was fun putting the tarps over in gusty wind and rain ? Any obvious mistakes? Edited March 17, 2017 by Dee 1 Link to comment Share on other sites More sharing options...
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