Moggaman Posted August 13, 2021 Share Posted August 13, 2021 Hi. Please see detail provided to me regarding area around eaves. My design does not have a cavity closer. The insulation will run up to meet the rafter insulation. Just wondering if the cavity closer has any structural properties or is it just there to ensure nothing gets down into cavity. If so, would a few more wall ties on the last course be warranted?. My question is not around whether is complies but around the reasoning for having one… thanks . Link to comment Share on other sites More sharing options...
ADLIan Posted August 13, 2021 Share Posted August 13, 2021 Cavity needs closing at top for fire safety - see appr doc B Link to comment Share on other sites More sharing options...
Dave Jones Posted August 13, 2021 Share Posted August 13, 2021 it doesnt, but it is good practice i guess. Link to comment Share on other sites More sharing options...
ADLIan Posted August 13, 2021 Share Posted August 13, 2021 See appro doc B. Not sure what an alternative approach would be especially post Grenfell Link to comment Share on other sites More sharing options...
Oz07 Posted August 13, 2021 Share Posted August 13, 2021 Never closed one on a single detached house in my life. Perhaps i've been doing it wrong Link to comment Share on other sites More sharing options...
Oz07 Posted August 13, 2021 Share Posted August 13, 2021 Maybe there's a difference when using full fill batts/wool or bead versus ventilated PIR insulation cavity Link to comment Share on other sites More sharing options...
Dave Jones Posted August 13, 2021 Share Posted August 13, 2021 19 minutes ago, Oz07 said: Never closed one on a single detached house in my life. Perhaps i've been doing it wrong you havent. Link to comment Share on other sites More sharing options...
ADLIan Posted August 13, 2021 Share Posted August 13, 2021 Sorry to be repetitive. See appr doc B ( relevant section has not changed for many, many years) Link to comment Share on other sites More sharing options...
Dave Jones Posted August 13, 2021 Share Posted August 13, 2021 38 minutes ago, ADLIan said: Sorry to be repetitive. See appr doc B ( relevant section has not changed for many, many years) could you quote the relevant section to enlighten us wrongdoers. Link to comment Share on other sites More sharing options...
ADLIan Posted August 13, 2021 Share Posted August 13, 2021 5.16 Link to comment Share on other sites More sharing options...
Moggaman Posted August 13, 2021 Author Share Posted August 13, 2021 Is fire safety the only reasoning?. For those of you that didn’t close the cavity at wallplate level, do u increase wall ties at wallplate level Link to comment Share on other sites More sharing options...
tonyshouse Posted August 13, 2021 Share Posted August 13, 2021 No, carry insulation up the cavity to seamlessly join with loft/roof insulation closing the cavity in masonry construction is likely to introduce a thermal bridge Link to comment Share on other sites More sharing options...
joe90 Posted August 13, 2021 Share Posted August 13, 2021 3 minutes ago, tonyshouse said: No, carry insulation up the cavity to seamlessly join with loft/roof insulation closing the cavity in masonry construction is likely to introduce a thermal bridge Exactly, and wot I dun (with knowledge of my building inspector). Note, I used rockwall full fill batts. Perhaps the regs are intended for vented cavity. 1 Link to comment Share on other sites More sharing options...
joe90 Posted August 13, 2021 Share Posted August 13, 2021 1 hour ago, Moggaman said: Is fire safety the only reasoning?. For those of you that didn’t close the cavity at wallplate level, do u increase wall ties at wallplate level No 1 1 Link to comment Share on other sites More sharing options...
Gordo Posted October 30, 2021 Share Posted October 30, 2021 (edited) On 13/08/2021 at 22:19, tonyshouse said: No, carry insulation up the cavity to seamlessly join with loft/roof insulation closing the cavity in masonry construction is likely to introduce a thermal bridge Best close cavities with polythene enclosed rockwool strips (cavity barriers) Compression fit between tops of two leafs Edited October 30, 2021 by Gordo Link to comment Share on other sites More sharing options...
Dave Jones Posted October 31, 2021 Share Posted October 31, 2021 On 13/08/2021 at 17:12, ADLIan said: 5.16 only relevant to multi property storied buildings. Not single occupancy houses. Link to comment Share on other sites More sharing options...
ADLIan Posted October 31, 2021 Share Posted October 31, 2021 Thanks Dave. Can you reference that statement please? Link to comment Share on other sites More sharing options...
Dave Jones Posted October 31, 2021 Share Posted October 31, 2021 Just now, ADLIan said: Thanks Dave. Can you reference that statement please? just read the regs 5.16 Link to comment Share on other sites More sharing options...
ADLIan Posted October 31, 2021 Share Posted October 31, 2021 I still cannot find any reference to differentiate single dwelling or multi storey/multi dwelling Link to comment Share on other sites More sharing options...
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