SBMS Posted August 30 Share Posted August 30 Interested to hear people's thoughts here - how did you fit your intermediary floor joists? A very quick comparison: Built into blockwork: quick and easy for brickies, no squeeky floors, difficult to airtight (Tony Tray needed) Joist Hangers: better for airtightness (but detailing still needed to account for mortar drying, timber shrinking), pre-engineered by posi joist designer, have heard they move and can be squeaky Ring Beam: ideal for airtightness, brickies and just construct the walls, more work to construct, structural engineer needed to specify bolts and sizes etc, again have heard they move and can be squeaky Thoughts? Link to comment Share on other sites More sharing options...
joe90 Posted August 30 Share Posted August 30 On my build we used joist hangers built into block work, no squeaky floors, air test was good. Link to comment Share on other sites More sharing options...
SBMS Posted August 30 Author Share Posted August 30 8 minutes ago, joe90 said: On my build we used joist hangers built into block work, no squeaky floors, air test was good. Did you seal around the hangers for airtightness? Link to comment Share on other sites More sharing options...
joe90 Posted August 30 Share Posted August 30 1 hour ago, SBMS said: Did you seal around the hangers for airtightness? Yes, the gap between upstairs flooring and downstairs ceiling was parged (above and below was wet plastered). Link to comment Share on other sites More sharing options...
Dave Jones Posted August 30 Share Posted August 30 Hangers are more money, more work, prone to moving and noise. built in are not, £20 of dpc and they airtight as well. Link to comment Share on other sites More sharing options...
joe90 Posted August 30 Share Posted August 30 (edited) 1 hour ago, Dave Jones said: prone to moving and noise. Well mine don’t. 1 hour ago, Dave Jones said: more work, No cutting of blocks 1 hour ago, Dave Jones said: Hangers are more money, A pittance in the cost of building a house Edited August 30 by joe90 Link to comment Share on other sites More sharing options...
joe90 Posted August 30 Share Posted August 30 1 hour ago, Dave Jones said: built in are not, Timber joists shrink so can become loose in the blockwork, joists are screwed to hangers to stop them moving. Link to comment Share on other sites More sharing options...
SBMS Posted August 30 Author Share Posted August 30 We’ve got floors that are built into blockwork in current house. They bounce a bit on a couple of long spans but don’t squeak. anyone else any experience with hangers? I wonder if we should specify 400mm spacing if we go with hangers.. Link to comment Share on other sites More sharing options...
joe90 Posted August 30 Share Posted August 30 32 minutes ago, SBMS said: I wonder if we should specify 400mm spacing if we go with hangers. I went with 400mm spacing but joists specced at 600 because I hate bouncy floors. Link to comment Share on other sites More sharing options...
Mike Posted August 30 Share Posted August 30 35 minutes ago, SBMS said: anyone else any experience with hangers? I wonder if we should specify 400mm spacing if we go with hangers. Never had a problem with them - just make sure you fix the timbers to them with the square-twisted nails intended for the purpose (aka joist hanger nails). If you do reduce joist spacing, make sure you still have enough space for any pipes or the like that you need to fit between them. Link to comment Share on other sites More sharing options...
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