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Green Building Bible, Fourth Edition
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General: Recommendation for sealing basic ceiling roses

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1 to 19 of 19

  1.  
    • CommentAuthordelprado
    • CommentTimeDec 7th 2016
     
    Is there a simply product out there that does this?

    Thanks
    • CommentAuthorcjard
    • CommentTimeDec 7th 2016
     
    • CommentAuthorgravelld
    • CommentTimeDec 7th 2016
     
    Can you seal from above? That's easiest, use a polymer sealant, I like Soudal Fix All.
    • CommentAuthordelprado
    • CommentTimeDec 7th 2016
     
    But are these air tight? I thought none of them werent
    •  
      CommentAuthordjh
    • CommentTimeDec 7th 2016
     
    That's why people build service cavities. So the cables and screws don't interfere with the airtightness.
  6.  
    You could take each separate T&E cable through a grommet. Use EPDM offcuts and air tightness tape.
    • CommentAuthorgravelld
    • CommentTimeDec 7th 2016 edited
     
    Posted By: delpradoBut are these air tight? I thought none of them werent
    the sealant or the rose? If the latter, see djh or build an airtight box over the top of the rose over the ceiling. Quite difficult for such a large size because of joists.
    • CommentAuthorringi
    • CommentTimeDec 7th 2016
     
    Posted By: delpradoBut are these air tight? I thought none of them werent


    Being 95% air tight is a lot better then a hole that is 0% airtight! All these products gives a lot better then 95% air tightness, they are just not good enough for sealing very large gaps.

    If you have access from above, I would tape over all the gaps on the ceiling side, with the tape fitted round the cable, hence sealing the hole. Then screw the rose onto the ceiling and do the wiring.

    Once I have tested all the wiring I would then just mix up some filler with a little more water then normal, and just spread it into the hole and over the edge from above. AC50 would be even better if you have it, as it is flexible.

    The tape only has to stop too much of the filler leaking into the rose while it is setting, the rose will hold the tape in place.
    • CommentAuthortony
    • CommentTimeDec 7th 2016
     
    I use acrylic sealant (decorators caulk)
    • CommentAuthorgravelld
    • CommentTimeDec 7th 2016
     
    That's nicer to work with but not as flexible.
    •  
      CommentAuthordjh
    • CommentTimeDec 7th 2016
     
    The main problem with most sealants is not their flexibility but their adhesion, especially to any surface that is not surgically clean.
    • CommentAuthorcjard
    • CommentTimeDec 8th 2016 edited
     
    Have you ever used Sticks like Shit?

    For even better stick you can soak chalky plasterboard edges in a 50/50 PVA and water mix first and let it dry, but I didn't find it necessary when glueing the chalk edges of the wall plasterboarda to the ceiling boards (as opposed to noggins) in my place. It's stood up pretty well to a plasterer spreading the ceiling skim

    No PVA? For most gunnable glues if the surface isn't clean I.e, dusty, put some of the glue on the surface and rub it in the dust, forming a paste. It bonds pretty well to the surface then! This trick doesn't work for oily surfaces, mind
    • CommentAuthorringi
    • CommentTimeDec 8th 2016
     
    Posted By: cjardNo PVA? For most gunnable glues if the surface isn't clean I.e, dusty, put some of the glue on the surface and rub it in the dust, forming a paste. It bonds pretty well to the surface then! This trick doesn't work for oily surfaces, mind


    This works VERY help for hands....
  14.  
    For North American readers, these are the sort of things we can use:

    http://www.alliedmoulded.com/go/energy
    http://www.lessco-airtight.com/

    Paul in Montreal
    • CommentAuthorgravelld
    • CommentTimeDec 8th 2016
     
    Posted By: djhThe main problem with most sealants is not their flexibility but their adhesion, especially to any surface that is not surgically clean.
    Not sure if I'd go as far as "surgically clean", I find after a vacuum and quick wipe the sealant sticks fine depending on the surface (e.g. plasterboard). Maybe all these seals are going to fail with time?
    • CommentAuthorringi
    • CommentTimeDec 8th 2016
     
    If you can access from above, you have a lot larger area to stick the sealant to, as you can seal past the edge of the hole and hence glue onto the paper.
    • CommentAuthorgravelld
    • CommentTimeDec 8th 2016
     
    Yeah, gets difficult with joists though, which is particularly an issue with ceiling roses because of the size.
    •  
      CommentAuthordjh
    • CommentTimeDec 8th 2016
     
    Posted By: gravelldMaybe all these seals are going to fail with time?

    Exactly.
    • CommentAuthorgravelld
    • CommentTimeDec 8th 2016
     
    Great! Better get wrapping the house then... The only real failsafe solution for retrofit air tightness do you think?

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