Joist hangers too big for joists?

[danlightbulb]

Doing this job today so hoping for quick response.

I have several 6x2 joists to fit so I bought nominally 6x2 hangers. But the joists are closer to 140mm height and the hangers are more like 147mm, so the top of the hanger sticks above the top of the joist.

I need the tops level/flush for flooring.

Do I have to trim down every hanger by a few mm, or shim the base of the hanger to lift the joist up within it?

Or do I downsize the hanger?

If shims, what is suitable? It will be there a long time I need something that won't deteriorate. I have a selection of plastic packers but I don't know if they are strong enough to hold a joist and floor?

 

[^woody^]

Pack them up with the same material the joists are made of, then the packing with last as long as the joists and be as strong as them!

 

[danlightbulb]

Ok just means cutting a load of 5mm slices off the 6x2. Bit awkward.

 

[freddiemercurystwin]

Mitre saw would take 5mins.

 

[opps]

Would 5mm nylon spacers not suffice.

And what happens if they are ceiling joists? How do you deal with the 5mm when it comes to plasterboarding?

 

[Deluks]

Let the joists in by a couple of mm to accommodate the depth of the hanger then add strips of 9mm ply on top of the joists.

Or angle grind the tops of the hangers.

Or send the timber back, 140mm is not a 6x2 should be 145 or 147

 

[danlightbulb]

Would 5mm nylon spacers not suffice.

And what happens if they are ceiling joists? How do you deal with the 5mm when it comes to plasterboarding?

Given there is natural variability in joist depths for each nominal size, I would have thought they should make the joist hangers to the smaller of the range so that you can then level them up when fitting without needing shims.

Or send the timber back, 140mm is not a 6x2 should be 145 or 147

It's probably just under 145 on most of them but yeah there is a couple touching 140mm. I agree it's poor but it's difficult to mess about sending it back, I'm not a building site I'm a normal house I can't have these stored anywhere and there's no guarantee another batch would be any better.

But I agree it's poor, they saw and plane these to size so they should all be exact.

 

[johnny2007]

If you have metal shears, you can cut those 5mm in 10 minutes.
Or grind them, they don't need to look pretty.

 

[^woody^]

You've bought regularised timber which is always smaller. You should have asked for rough sawn.

The issue with regularise timber is that they may not be compliant with span tables.

 

[danlightbulb]

You've bought regularised timber which is always smaller. You should have asked for rough sawn.

The issue with regularise timber is that they may not be compliant with span tables.

I've never seen rough sawn in these dimensions. 6x2 and 8x2 c24? I got this from a builders merchant not a diy shed.

You seem to be from my region of UK where do you buy from?

 

[robinbanks]

Just fold(hammer) any proud part of the top of the hanger down over the relevant joist




If your complaint is that a right angled part of the hanger is proud, hammer and chisel to split it into two fingers on the right angle, then hammer them flat

 

[danlightbulb]

Just fold(hammer) any proud part of the top of the hanger down over the relevant joist


View attachment 388834

If your complaint is that a right angled part of the hanger is proud, hammer and chisel to split it into two fingers on the right angle, then hammer them flat

I used the 3mm face fix ones, they are much thicker and don't bend like those ones.

 

[^woody^]

I've never seen rough sawn in these dimensions. 6x2 and 8x2 c24? I got this from a builders merchant not a diy shed.

You seem to be from my region of UK where do you buy from?

There has been a big shift to only selling regularised timber over the past few years and for rough sawn you may need to go to a proper timber suppler/saw mill. However, Jewsons may still sell some limited sizes.

Regularized is not a problem as long as you allow for it (including spans), but sometimes when matching floor and ceiling levels, it's best to get the right depth section to save messing about.

 

[danlightbulb]

Its all in now and Im pretty pleased with it. I had to use some 5mm packers and a couple of 9mm packers (used sheet plywood offcuts).

I installed the joists crown up as you're supposed to. One of them is a little higher in the middle compared to the others. Do I just fit the flooring anyway and let it settle on its own, or do I plane the high spot off?

 

[robinbanks]

Is it fully nailed in? If yes, I'd plane it rather than mess about pulling a bunch of square twisties out. If it's only lightly fixed in, how about moving it to the edge?