Cavity closer

mickdw

The closer is supposed to be a thing of the past with the insulation now continuing down to meet the insulation in cavity to avoid any cold bridge. It is nonsense though to be honest & I cannot see how the structure would stand without it unless 9" wall was used internally.
What you are doing has been done for years as a standard detail with no rot issues. Should be fine as long as the ventilation gap is maintained. No point running the insulation down the outside of the wall towards the soffit as you have shown

teepee

Where in the Homebond book does it say a cavity closer is a thing of the past

atech

It's in the DOELG's cavity wall acceptable construction details, details 1.09-1.14.

http://www.environ.ie/en/Publications/DevelopmentandHousing/BuildingStandards/FileDownLoad,18751,en.pdf

I'd say they got a fair few comments to ammend that from a structural perspective.

To my knowledge the next Part L will factor in things like cold bridging at cavity closers, cills and floor junctions along with bringing u-values down to about 0.22 which will effectively eliminate traditional cavity walls.

teepee

Will homebond stand over this , it doesnt seem like good building practice , where would the wall plate sit on the inner or outside wall and if no cavity closer is been used would the single wall have to be beefed up from a 100mm block to a 150 or 225mm block to bear the structure weight of the whole roof

muffler

We have lost the run of things here. I'll move the comments to a new thread.

atech

teepee wrote: »

Will homebond stand over this , it doesnt seem like good building practice , where would the wall plate sit on the inner or outside wall and if no cavity closer is been used would the single wall have to be beefed up from a 100mm block to a 150 or 225mm block to bear the structure weight of the whole roof

By Homebond, I am assuming you mean their structural insurance cover. I would imagine if the building has been signed off for building regulation compliance by a qualified architect/structural engineer, etc then Homebond would not have an issue with this.

I myself (not a structural engineer) would have concerns about this from a lateral wind loading and if I was qualified to issue certificates of compliance would not do so without getting a structural engineer to confirm and sign-off on this and other specific details. If the wallplate was resting on a block on flat then I would sleep easier at night.

There is some good opinions on this in an old thread, worth a look.
Over a year later and I myself had not heard any clarity from the DOELG or Homebond on this issue.

http://www.boards.ie/vbulletin/showthread.php?t=2055444995