Moonshine Posted March 5, 2021 Share Posted March 5, 2021 Has anyone brought ready made window cavity closers https://subframes.co.uk/ Seems like a good investment to get the brickies to build up to the right window openings. Link to comment Share on other sites More sharing options...
Oz07 Posted March 5, 2021 Share Posted March 5, 2021 Yes not sure if it was that exact company but much better than fitting afterwards. Very cheap too compared to time measuring and cutting afterwards plus sacrificial cost of timber formers Link to comment Share on other sites More sharing options...
Moonshine Posted March 5, 2021 Author Share Posted March 5, 2021 4 minutes ago, Oz07 said: Yes not sure if it was that exact company but much better than fitting afterwards. Very cheap too compared to time measuring and cutting afterwards plus sacrificial cost of timber formers i would be interested to find out what other companies provide them. Link to comment Share on other sites More sharing options...
Oz07 Posted March 5, 2021 Share Posted March 5, 2021 Just checked it was that company. 1 Link to comment Share on other sites More sharing options...
nod Posted March 5, 2021 Share Posted March 5, 2021 Most new site use them If you contact your widow supplier They should be able to supply formers to you 1 Link to comment Share on other sites More sharing options...
Dave Jones Posted March 6, 2021 Share Posted March 6, 2021 I use https://subframes.co.uk/ not only do they provide insulation to to the reveals more importantly they are square which means you aren’t relying on the Brickie’s 4 foot level for door openings. Link to comment Share on other sites More sharing options...
tonyshouse Posted March 6, 2021 Share Posted March 6, 2021 I hate them, they cause a lot of air leakage and cracking ? Link to comment Share on other sites More sharing options...
Moonshine Posted March 6, 2021 Author Share Posted March 6, 2021 14 minutes ago, tonyshouse said: I hate them, they cause a lot of air leakage and cracking ? Can you elaborate how? Link to comment Share on other sites More sharing options...
tonyshouse Posted March 6, 2021 Share Posted March 6, 2021 Between the blockwork and the closer there are gaps, ditto in the corners, then outdoor sit bets through these gaps and behind linings, with wet plaster where the closer joking the blocks it cracks through the plaster Link to comment Share on other sites More sharing options...
SteamyTea Posted March 6, 2021 Share Posted March 6, 2021 13 minutes ago, tonyshouse said: Between the blockwork and the closer there are gaps, ditto in the corners, then outdoor sit bets through these gaps and behind linings, with wet plaster where the closer joking the blocks it cracks through the plaster Can you turn off autocorrect? 1 Link to comment Share on other sites More sharing options...
Oz07 Posted March 6, 2021 Share Posted March 6, 2021 @tonyshouse I used them and got 1.19 air test. Its all about the detailing. Lots of flexible sealants, tapes, foam available. At least the bottom corners of these are welded Link to comment Share on other sites More sharing options...
Moonshine Posted March 6, 2021 Author Share Posted March 6, 2021 20 minutes ago, Oz07 said: @tonyshouse I used them and got 1.19 air test. Its all about the detailing. Lots of flexible sealants, tapes, foam available. At least the bottom corners of these are welded Have you got your construction detailing you can share? I am proposing to use and air tightness tap around windows when they are fitted Link to comment Share on other sites More sharing options...
Oz07 Posted March 6, 2021 Share Posted March 6, 2021 Cavity closers built in, blockwork pargecoated inc reveals upto closers. Windows fitted, clearance caps left unfilled at fitting. Window board fitted foamed underneath with decent 10mm ish gap. Illbruck airtight foam. 10mm ish OSB board cut into strips roughly sized from back of window frame to face of blockwork. These all stuck to blockwork/lintel obviously spanning junction of cavity closer to blockwork. Illbruck airtight foam again. Fill window gaps in internally at this point also. Screw plasterboard onto osb job done. Wetting the OSB and blockwork/lintel seemed to help. It's a pain to set up but easy if long winded after. Window board goes on first to give you a level platform. A jig built to hold the head OSB while the foam gets it. After half a day than comes out and reveals cam be stuck on and held with friction or a couple of temp pins into head and window board. Good for blind fixing in head too. 1 Link to comment Share on other sites More sharing options...
Moonshine Posted March 6, 2021 Author Share Posted March 6, 2021 3 minutes ago, Oz07 said: Cavity closers built in, blockwork pargecoated inc reveals upto closers. Windows fitted, clearance caps left unfilled at fitting. Window board fitted foamed underneath with decent 10mm ish gap. Illbruck airtight foam. 10mm ish OSB board cut into strips roughly sized from back of window frame to face of blockwork. These all stuck to blockwork/lintel obviously spanning junction of cavity closer to blockwork. Illbruck airtight foam again. Fill window gaps in internally at this point also. Screw plasterboard onto osb job done. Wetting the OSB and blockwork/lintel seemed to help. It's a pain to set up but easy if long winded after. Window board goes on first to give you a level platform. A jig built to hold the head OSB while the foam gets it. After half a day than comes out and reveals cam be stuck on and held with friction or a couple of temp pins into head and window board. Good for blind fixing in head too. Sounds interesting, have you got any drawings / pictures? Link to comment Share on other sites More sharing options...
Oz07 Posted March 6, 2021 Share Posted March 6, 2021 I lost my phone between end of first fix and plastering so lost a load. I have some pics but non which I think show that detail luckily had some with wires/pipes I'll see if any in background. No drawings I made it up on the hoof Link to comment Share on other sites More sharing options...
Oz07 Posted March 6, 2021 Share Posted March 6, 2021 Found one which shows the bathroom window and a small window in another room. These don't have the jambs on yet as I went round doing all the heads first with the jig. Just do a window every few hrs 2 or 3 a day while doing other things. Link to comment Share on other sites More sharing options...
Faz Posted March 6, 2021 Share Posted March 6, 2021 I was fitting a load of these yesterday - cut to correct cavity size (they are scored to various widths) clean any snots off the brick and block and they fit nicely. I am using epoxy to install followed by a few clout nails. Finish with EPDM on top for airtightness. Link to comment Share on other sites More sharing options...
SteamyTea Posted March 6, 2021 Share Posted March 6, 2021 Isn't the real problem that we still have cavities? 1 Link to comment Share on other sites More sharing options...
tonyshouse Posted March 6, 2021 Share Posted March 6, 2021 YES! Link to comment Share on other sites More sharing options...
craig Posted March 6, 2021 Share Posted March 6, 2021 1 hour ago, SteamyTea said: Isn't the real problem that we still have cavities? Most definitely. Link to comment Share on other sites More sharing options...
Oz07 Posted March 7, 2021 Share Posted March 7, 2021 21 hours ago, tonyshouse said: YES! Isn't your place cavity tony? Link to comment Share on other sites More sharing options...
tonyshouse Posted March 7, 2021 Share Posted March 7, 2021 Depends how you look at it, solid recycled aggregate block walls with 300mm EWI clad with brick or a 300mm fully filled cavity wall Link to comment Share on other sites More sharing options...
Oz07 Posted March 7, 2021 Share Posted March 7, 2021 So it's cavity construction then ? Link to comment Share on other sites More sharing options...
Oz07 Posted March 7, 2021 Share Posted March 7, 2021 Another couple of thoughts with this sorry @tonyshouse Not having a go. 1. My new vehicle is not a car it's a futuristic spaceship which levitates on air. It just uses some thin pieces of rubber to contain said air. 2. Having double cavity width than someone else isn't a reason to criticise the method of construction. If you were limited on your external dimensions then the sums don't add up. My area doesn't have particularly high property prices but I can tell you if I doubled my cavity width to 300mm, then my place would be worth approx £375 less per linear metre of external wall per floor. Done the back of fat packet maths and it's going to take a lot of heating savings to pay back. 1 Link to comment Share on other sites More sharing options...
tonyshouse Posted March 7, 2021 Share Posted March 7, 2021 Thanks, no I love it, verging on a philosophical discussion! The problem with economic calculations is that we would all live in cardboard boxes or shipping containers, government policy sets (or thinks it sets) minimum standards, yes my rooms are slightly smaller than they would have been without my wide cavity - a price I am prepared to carry in order to live without a boiler. Then the old chestnut of over what timescale should we do calculations? How long will a building last? all good fun. 1 Link to comment Share on other sites More sharing options...
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