Ceiling woes

[sidinz]

I decided to remove the sagging pinex ceiling and gib it. After clouds and clouds of choking dust that got into everything, the pinex was gone, leaving me to discover that it wasn't what was sagging - the joist was. It's significantly bowed and the some of the others look a little uneven, too. Now what?

[Bobsyouruncle]

Get a bloke in ASAP? OR do you want to fix yourself?

[Kirwee]

Are you offering to do the repairs Dean?

[Kirwee]

I would suggest that if other joists have bowed and it's not just one then you need to find out why. If the roof is a concrete tile type there will be a lot of weight up there and the purlins may be sagging which, depending on whether there is a brace between the purlin and joists, could be the undelaying cause. If the purlins are straight then maybe a brace between the joists and purlins could be installed to correct the sag in the joists. Subsidence of the house foundations can also cause roof issues too.

[Aston]

If you have a ceiling cavity, then the installation of a strongback above the joists may resolve the issue. See example here.

[sidinz]

I would suggest that if other joists have bowed and it's not just one then you need to find out why. If the roof is a concrete tile type there will be a lot of weight up there

Tin roof. And the sagging joist runs parallel to the loadbearing parts. The other joists weren't bowed like this one - things just didn't look flush. I have a keen eye for when things are not straight/level and when I looked up at the framing, it didn't look quite right. But to be honest, I was more concerned with the drooping joist which is about 4m long and runs the length of the room. Perhaps when it was built they were a bit tight with the cross-bracing.

[Wayne]

What size is the joist for 4m length?

[sidinz]

I didn't measure it, but it looked like standard 2 X 4 framing timber. I'll measure it this weekend.

[Wayne]

I'd have to check but 4m for 100x50 seems a bit long for a joist - could be just sag.

[Viking]

Acrow prop it up and add some more bracing. Nails and gorilla glue.

[andym15]

I would suggest that if other joists have bowed and it's not just one then you need to find out why. If the roof is a concrete tile type there will be a lot of weight up there and the purlins may be sagging which, depending on whether there is a brace between the purlin and joists, could be the undelaying cause. If the purlins are straight then maybe a brace between the joists and purlins could be installed to correct the sag in the joists. Subsidence of the house foundations can also cause roof issues too.

If foudn this online, it might help you identify if subsidence is the cause - http://www.uretek.co.uk/ground-engin...ing-subsidence