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Is this "cold bridging"?
The condensation forms around the plaster next to the upvc and is approx 2" deep.
I'm wondering if there is a void behind the upvc that's allowing this bridging. Would injecting expanding foam into this possible void help?
Externally the upvc butts tight up against the brickwork not giving any access for foam. I guess I could knock out the affected plaster from inside and fill (if it exists) the void and then replaster. Or, could I drill small injector holes into the upvc (where the doors close into) fill from there and hide the holes with mastic?
Its an old set of doors we inherited with the house.
Any advice appreciated.
Have a google for 'Cavity Closers' - they're designed to insulate the cavity and prevent damp bridging. Normally they have to be put in before the door frame though so you may need some trimming to fit.
I'd try and drill a hole through where the cavity should be (maybe where a skirting board is to hide it after?) to see what's in there already.
Thanks for that. Google image of a cavity closer shows what I think is missing. I guess removing the doors is an option, maybe. If I used expanding foam I'd need a damn big can as that's the whole house cavity void 😉
Could it be a metal lintel above the patio doors? If that's the case, I'd just suggest removing the lintel, what's the worst that could happen?
Use a big hammer and get someone to video it plz.
I guess removing the doors is an option, maybe.
Not that hard to do. Take the doors off their hinges and put somewhere safe. Now you have a faily light frame which is held in my a dozen or so masonry screws. Unscrew these and it should come out. If they haven't used foam and just used exterior mastic, it should come out easily enough. Two man job to handle a double frame as you might need to help it out a bit if mastic / foam is sticking to the brick work etc.