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4451 posts

Uber Geek

#293310 13-Jan-2022 09:21
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I have a sub-frame that the joists aren't all the same height, it looks like some various from when they were milled. I'd like to get them as consistent as possible before laying the decking on top. I know the standard approach is to plane down the high ones (and any other high points), but I don't have a few that are too high - but rather a few that are too low.


Do I need to plane all the others down to match the few lower ones, or is there a material I can put on top of the low ones to raise their height instead?



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Uber Geek


  #2849843 13-Jan-2022 12:39
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Shimming on top is possible, but you will end up with a lot of shims. I'd usually aim to shim between bearer and joist. If it is only a few mm, I would whack a bar in to loosen the nails then slide a shim in afterwards to bring it up a couple of mm (don't remove any fastenings).

If that's not possible, joist tape would be another good option but someone mentioned tape reacting to composite? I haven't come across that before but probably worth testing on an offcut. I'm sure I've seen at least one YouTube video with composite decking and joist tape - probably Robin Clevett. But would depend on exact composition of tape and decking.

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