Okay to use lightweight thermalite blocks for bricking up a window(cavity wall)
Good day firends,
Is it okay to use those grey, lightweight Thermalite Aircrete blocks for bricking up a window in a cavity wall? The outside of the wall will be rendered with sand & portland cement afterwards. As it's just a window I want to brick up, it will not be load bearing. I'm mainly concerned about the moisture absorbtion tenedencies of these blocks. (They soak up damp like a sponge, don't they? I'm not sure if that's an issue or not. Does rendering stick to them okay?) Many thanks, JD |
Okay to use lightweight thermalite blocks for bricking up awindow (cavity wall)
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Okay to use lightweight thermalite blocks for bricking up awindow (cavity wall)
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Okay to use lightweight thermalite blocks for bricking up awindow (cavity wall)
On 16/08/16 14:33, wrote:
On Tuesday, August 16, 2016 at 12:35:19 PM UTC+1, The Natural Philosopher wrote: On 16/08/16 12:30, wrote: Good day firends, Is it okay to use those grey, lightweight Thermalite Aircrete blocks for bricking up a window in a cavity wall? The outside of the wall will be rendered with sand & portland cement afterwards. As it's just a window I want to brick up, it will not be load bearing. I'm mainly concerned about the moisture absorbtion tenedencies of these blocks. (They soak up damp like a sponge, don't they? I'm not sure if that's an issue or not. Does rendering stick to them okay?) Many thanks, JD Justs fine mate. I've seen whole houses made of em. Put a vapour barrier inside tho Thank you! When you say 'vapour barrier', do you meaning something like sheet foam polystyrene inside the cavity? The existing walls have 30mm sheet polystyrene inside the cavity. If I emulate this when I brick up the window with thermalite blocks, will this serve okay? I didn't. I meant more like a sheet of polythene first. But it will probably be fine with the polystyrene JD JD -- How fortunate for governments that the people they administer don't think. Adolf Hitler |
Okay to use lightweight thermalite blocks for bricking up awindow (cavity wall)
The Natural Philosopher wrote:
wrote: When you say 'vapour barrier', do you meaning something like sheet foam polystyrene inside the cavity? I didn't. I meant more like a sheet of polythene first. But it will probably be fine with the polystyrene You'd probably want to use a strip of "cavity closer" bottom and sides of the new opening, and whatever lintel at the top. https://www.travisperkins.co.uk/Product/c/c/c/c/c/1500218 |
Okay to use lightweight thermalite blocks for bricking up awindow (cavity wall)
On 16/08/2016 18:00, rick wrote:
On 8/16/2016 12:30 PM, wrote: Good day firends, Is it okay to use those grey, lightweight Thermalite Aircrete blocks for bricking up a window in a cavity wall? The outside of the wall will be rendered with sand & portland cement afterwards. As it's just a window I want to brick up, it will not be load bearing. I'm mainly concerned about the moisture absorbtion tenedencies of these blocks. (They soak up damp like a sponge, don't they? I'm not sure if that's an issue or not. Does rendering stick to them okay?) Many thanks, JD I would not use Thermalite on external skin ... if that is what you are intending doing ........... using plain concrete (cheaper as well) Use Themalite on inner skin. Don't forget dpc integrity - don't bridge the cavity. It's fine. He's going to render it. I've seen numerous extensions done this way, even with a solid 9 inch wall constructed of grey semi-lightwweight blocks, rendered and coated with pea shingle for weather protection. |
Okay to use lightweight thermalite blocks for bricking up awindow (cavity wall)
On Wednesday, 17 August 2016 07:34:26 UTC+1, Andy Burns wrote:
You'd probably want to use a strip of "cavity closer" bottom and sides of the new opening, and whatever lintel at the top. https://www.travisperkins.co.uk/Product/c/c/c/c/c/1500218 You don't need a lintel when the blocks will support the triangle of brickwork above. Nor do you need a cavity closer, just complete the wall & insulation the same way as the rest of it. NT |
Okay to use lightweight thermalite blocks for bricking up awindow (cavity wall)
On Wed, 17 Aug 2016 03:49:55 -0700, tabbypurr wrote:
On Wednesday, 17 August 2016 07:34:26 UTC+1, Andy Burns wrote: You'd probably want to use a strip of "cavity closer" bottom and sides of the new opening, and whatever lintel at the top. https://www.travisperkins.co.uk/Product/c/c/c/c/c/1500218 You don't need a lintel when the blocks will support the triangle of brickwork above. Nor do you need a cavity closer, just complete the wall & insulation the same way as the rest of it. NT Just checking - are you saying that the lintel should be removed? I assume that there is one if this is a window opening. Cheers Dave R -- Windows 8.1 on PCSpecialist box |
Okay to use lightweight thermalite blocks for bricking up awindow (cavity wall)
On Wednesday, 17 August 2016 14:32:01 UTC+1, David wrote:
On Wed, 17 Aug 2016 03:49:55 -0700, tabbypurr wrote: On Wednesday, 17 August 2016 07:34:26 UTC+1, Andy Burns wrote: You'd probably want to use a strip of "cavity closer" bottom and sides of the new opening, and whatever lintel at the top. https://www.travisperkins.co.uk/Product/c/c/c/c/c/1500218 You don't need a lintel when the blocks will support the triangle of brickwork above. Nor do you need a cavity closer, just complete the wall & insulation the same way as the rest of it. Just checking - are you saying that the lintel should be removed? I assume that there is one if this is a window opening. I'm saying there's no need to add one. That should be fairly obvious, but Andy's comment was interpretable that way. NT |
Okay to use lightweight thermalite blocks for bricking up awindow (cavity wall)
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