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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
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Housing - Renovation: Missing insulation under door sils

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  1.  
    • CommentAuthorNewbuild
    • CommentTimeNov 10th 2022
     
    I have some missing insulation underneath some doors that go to a balcony. As far as I can tell its roughly like the detail attached (I used a endoscope from outside and could see through to the first floor joist).

    Access from inside is limited as the floor is tiled; is there anything I can do from outside to fill the void? I could quite easily drill hole through the mortar joints under the sil.
      chrome_OcP1AMcl5a.png
    • CommentAuthorMike1
    • CommentTimeNov 10th 2022
     
    A can of low-expansion foam (illbuck FM330 or similar) could be the easiest option; use multiples holes so you can see how it's expanding / how full it is.
    • CommentAuthorNewbuild
    • CommentTimeNov 10th 2022
     
    How far can you reach with that approach? The blockwork is about 30cm wide so my holes in the perps would be that distance between each other.

    I've considered removing the window set but its a massive job to do that.
    • CommentAuthorMike1
    • CommentTimeNov 11th 2022
     
    That shouldn't be a problem - low expansion foam will still expand, but won't go mad and there's less risk of deforming the door frame. Maybe you - or a friend - can use the endoscope a couple of joints away to monitor what's happening for the initial fills.
    • CommentAuthortony
    • CommentTimeNov 11th 2022
     
    EPS beads blown in for me
    •  
      CommentAuthordjh
    • CommentTimeNov 11th 2022
     
    Posted By: tonyEPS beads blown in for me
    What size holes does that need?
    • CommentAuthorNewbuild
    • CommentTimeNov 11th 2022
     
    Is it something you can DIY? My only concern would be that if the inner leaf is short of the subfloor, it will blow beads into the void under the floorboards and first joist and take absolutely loads of beads.
    •  
      CommentAuthordjh
    • CommentTimeNov 11th 2022 edited
     
    Posted By: NewbuildMy only concern would be that if the inner leaf is short of the subfloor
    In your diagram, the floor is resting on the inner leaf. So how would it be short?
    • CommentAuthortony
    • CommentTimeNov 11th 2022
     
    EPS beads can be blown through 22mm copper or plastic tube , I would do foam to the cavity each side of the reveal first to stop beads going down the cavity
    • CommentAuthorNewbuild
    • CommentTimeNov 12th 2022
     
    For whatever reason in some areas the inner leaf is lower than the subfloor, with my borescope I can go straight through the cavity to a floor joist.

    Hopefully rest of the cavity is full filled.

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