Repairing joist I can only access on one side

[Ozzpala]

Got a joist end that’s rotten we had a leak all sorted out but going to have a go at fixing the joist end that’s rotten

The issue I’ve got is one side is really close to the external wall so I’ve only got access on one side of it. My idea was to pop the end off and fit some plates but I won’t be able to secure it from the other side due to how close it is to the wall for access. I was thinking of using bower beam plates however the access to one side I’ve no idea if it will work? Unless someone has any other ideas?

I’ve attached a picture of the setup the joist in question is the blue line

 

[foxhole]

Is there room on blind side for ply? You could then screw thru your beam support one side thru timber into ply plate .

 

[slawit]

Rather than bower beams could you fit a bespoke metal U channel from the underside then attach with bolts if you have room on the back side just to slip a nut on

 

[Scally-Ho]

@Ozzpala How much measured space is there between the rotting joist and the wall that is causing you the problem?

 

[Ozzpala]

The joist is butted up right against the wall to the point I can’t even slide a finger in there. So access to one side is literally all I have

 

[slawit]

The joist is butted up right against the wall to the point I can’t even slide a finger in there. So access to one side is literally all I have

In that case why not just use anchor bolts and fix the joist to that wall?

 

[robinbanks]

You'll be fine just sistering a long length of full height ply to the one side of the joist, glued and screwed with part threaded screws so they pull up tight

In that case why not just use anchor bolts and fix the joist to that wall?

At the end maybe, but don't do it in the middle

 

[slawit]

You'll be fine just sistering a long length of full height ply to the one side of the joist, glued and screwed with part threaded screws so they pull up tight

You'll be fine just sistering a long length of full height ply to the one side of the joist, glued and screwed with part threaded screws so they pull up tight


At the end maybe, but don't do it in the middle

Curious, why not in the middle, just wondering what I’m missing. My theory was it would be no different to a ledger board.

 

[robinbanks]

When you load the floor up with heavy stuff the joists not bolted to the wall sag, whereas the joist bolted to the wall doesn't. If all your joists sag 20mm say (let's throw an extreme value out there just for kicks), that's over a long length so you don't really notice.. but the one that's bolted to the wall doesn't, and the drop in the middle of the wall parallel with the joists, from 0mm (at the wall) to -20mm at the next parallel joist, say 400 or 600mm away; that's a lot more noticeable than dropping 20mm over 2 plus metres (4m wide room, every joist sagged 20mm)

Don't get me wrong, not saying you can't, just that if you do you may wish you hadn't!

 

[slawit]

Fair point.