Green Building Bible, Fourth Edition |
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Posted By: fostertome.g. following EWI failure in the only way it ever happens - sloppy detailing around window openings. Much better to let it run on down uninterrupted.Another reason to full fill re. my earlier idea
Posted By: gravelldWhat kind of faults?You've still got a 'void' filled with beads effectively same as 'void' formed of sold EPS, with same weatherproof skin having v low tolerance of inward liquid leakage thro that. So, just the same the skin has to be flawlessly, robustly sealed where it meets windows, cill etc. Except that your skin, if render, moves with a substantial board backing which expands/contracts with a mind of its own, rather than intimately bonded to solid EPS. More risky, I'd say, tho prob not v risky, at that.
Posted By: Ed DaviesRight, thought so. Just hadn't seen “full fill” used that way - normally people mean filling a cavity between bricks or blocks.Agree, I thought that when I wrote it. Just trying to differentiate between fill and sticking/fixing blocks against a wall.
Posted By: fostertomYou've still got a 'void' filled with beads effectively same as 'void' formed of sold EPS, with same weatherproof skin having v low tolerance of inward liquid leakage thro that. So, just the same the skin has to be flawlessly, robustly sealed where it meets windows, cill etc. Except that your skin, if render, moves with a substantial board backing which expands/contracts with a mind of its own, rather than intimately bonded to solid EPS. More risky, I'd say, tho prob not v risky, at that.Agree you still have to meticulously seal. I don't really see how the render issue, isolated, is much different though. Wouldn't EPS blocks possibly buckle against each other, pushing themselves out?
Posted By: gravelldWouldn't EPS blocks possibly buckle against each other, pushing themselves out?EPS blocks are fairly elastic. True that 'unmatured' they can take on a strong bend while lying loose, thro unequal weather exposure or internal stresses. But once you've got them glued in place they'll 'give' and stay more or less in installed shape, rather than pulling away from the substrate. Foam filling the joints, and the joint to the window frame, also holds things together - the block will 'give' rather than pulling away at the joints. So by rendering direct onto the EPS at the window junction, the render and its seal to the frame should stay unmoving in contact.
If you have a timber frame instead wouldn't that be a bit more forgiving?
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