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Showing results for tags 'posi joist'.
Found 4 results
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Hi, Head is a little done in with personal stuff at the moment, but I have to try and get my head around the best way to fit posi joists into different materials I have. I'm very keen to not have deflection/bounce, so the joists will be at 400 centres. 1. Into ICF. So I will be having a timber plate bolted into the ICF face/concrete core for the joists to fix to. Are there 2 options here - 1st is on hangers and the 2nd is on the top chord of the joist? 2. Into RSJ webs. Does the joist just simply sit into the RSJ web? I may have an option of changing the RSG for a posi joist, would that be better or worse? 3. Into load bearing 100mm block walls. Should I fix into the block work as it's built, or bolt a timber to the side of the blocks and fix the same as I would with the ICF walls? Are all joist hangers made the same or do some makes fix better than others? I've also seen mention on a post about face fix and top fix hangers. Any advice would be really appreciated Cheers Vijay
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Just noticed on posi joist spec that the space between the flanges on their slimmest joist (202mm) is 108mm, therefore not big enough for a 110mm soil pipe?!? Easi joist on the other hand, slimmest joist 195mm and 125mm between flanges. I have been through several design amendments with the posi joist dealer but seems that was all in vain.
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On our build we've done as others have and laid our first floor joists on an airtight membrane/ VCL which is turned up and lapped over the joist ends before tucking neatly into the first floor airtight layer. The underside will do the same at ground floor level. My question is about condensation forming towards the joist ends where they protrude towards the edge of the insulation in both upper and lower walls. Does the airtight membrane stop all air movement and therefore eliminate the risk or will warmer air still find it's way in somehow and then condense when it finds a cooler surface? I know in the US a lot is made of insulating rim boards correctly but this seems to be in situations without an airtight barrier. This must apply to a lot of TF builds or any construction type where joists carry across the walls at the 1st floor junction and I'm really wondering if the airtight membrane is a complete solution or not? Thanks
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Joists are here and dropped in at 400mm centes I'm thinking skew nail the top chord to the wall plate but would welcome any suggestions. For the most they are 97 or 122mm wide, would top down screws give a better fix? Can't find anything specific in the layout drawing or manufacturer installation details.
