LSB Posted August 31 Share Posted August 31 (edited) We are looking at fitting the following roof. The wall where the rafter fits is the internal wall below the rafter and for 2 blocks above it will be the external wall. This wall is built using H&H celcon high strength 7.3n aerated concrete block 440*102*100mm My question is, what sort of bolt should we use to fix the wall plate to this wall. The wall plate is 47 * 147 and the rafters are at 400 centres. The walls have been constructed, but we are wondering about them being aerated as the the decription. TIA Jill Edited August 31 by LSB Link to comment Share on other sites More sharing options...
JohnMo Posted August 31 Share Posted August 31 (edited) First question is what did the structural engineer specify? That should be your first port of call. If you haven't had any structural engineer involved you should. Would have thought they would be on hangers built into the wall. Handbook here https://www.google.com/url?sa=t&source=web&rct=j&opi=89978449&url=https://www.pasquill.co.uk/wp-content/uploads/2019/01/posi-joist-technical-handbook-2019.pdf&ved=2ahUKEwjQhdOhup-IAxW0WEEAHa8QNB8QFnoECB4QAQ&usg=AOvVaw30F2fl_4HxO29xMSPYJ6bu But having said the above - these are good. https://www.screwfix.com/p/dewalt-aerated-concrete-anchor-nylon-60mm-50-pack/454HT?tc=TA5&ds_rl=1247848&ds_rl=1241687&ds_rl=1245250&gad_source=1&ds_rl=1245250&ds_rl=1247848&gclid=Cj0KCQjw_sq2BhCUARIsAIVqmQvplppZTIs9pnhfHl1drL8qml8jhlOHJ2sxVX3WU1QsF5v912lcgHkaAtUGEALw_wcB&gclsrc=aw.ds You install them one turn in half a turn out until they are driven home. Or the other option is a chemical anchor, such as this https://www.screwfix.com/p/rawlplug-r-kem-ii-styrene-free-polyester-resin-300ml/32863 Edited August 31 by JohnMo 1 Link to comment Share on other sites More sharing options...
LSB Posted August 31 Author Share Posted August 31 32 minutes ago, JohnMo said: First question is what did the structural engineer specify? That should be your first port of call. If you haven't had any structural engineer involved you should. Would have thought they would be on hangers built into the wall. Handbook here https://www.google.com/url?sa=t&source=web&rct=j&opi=89978449&url=https://www.pasquill.co.uk/wp-content/uploads/2019/01/posi-joist-technical-handbook-2019.pdf&ved=2ahUKEwjQhdOhup-IAxW0WEEAHa8QNB8QFnoECB4QAQ&usg=AOvVaw30F2fl_4HxO29xMSPYJ6bu But having said the above - these are good. https://www.screwfix.com/p/dewalt-aerated-concrete-anchor-nylon-60mm-50-pack/454HT?tc=TA5&ds_rl=1247848&ds_rl=1241687&ds_rl=1245250&gad_source=1&ds_rl=1245250&ds_rl=1247848&gclid=Cj0KCQjw_sq2BhCUARIsAIVqmQvplppZTIs9pnhfHl1drL8qml8jhlOHJ2sxVX3WU1QsF5v912lcgHkaAtUGEALw_wcB&gclsrc=aw.ds You install them one turn in half a turn out until they are driven home. Or the other option is a chemical anchor, such as this https://www.screwfix.com/p/rawlplug-r-kem-ii-styrene-free-polyester-resin-300ml/32863 Thanks, the SE approved the rafter drawings, and the walls, but didn't actually specify the hangers 🙂 He is currently on holibobs for the next 2 weerks (I know because I'm waiting on him for some changes to the floor structure for phase 2) so no chance of involving him and we don't really want to wait for him to return to 1000 emails. I'll look at the links you sent Link to comment Share on other sites More sharing options...
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