Thread: ok how do i attach bearers to stumps?

I haven't seen a timber stumped house up here, if you exclude the really old joints. However, the framing manual shows the nominal fixing for bearer to timber stump as 4/3.75mm nails and a G.I. strap perforating the pier cap - nailed to the sides of the stump and to the top of the bearer.

I have seen one place (a transportable school building) that was on besser block stumps and the tie down was by steel cable attached to the bearer and to a steel eye bolt embedded in the footing. I thought that wasn't a bad idea to avoid the problem of pier cap penetration. Probably would need engineer's design though.

My kids school has just got some demountables and they have tensioned chain holding the building to the base of the stump running up at a 30 deg angle to the bearer

Originally Posted by thebuildingsurv

............AS 3660.1 shows a bracket that bolts from the bearer to the side of the stump, howeve I have only seen them used once.

Come up north and you'll see heaps of old Queenslanders (high set timber houses) with this tie down connection.


Mick

I had my house re-stumped a few years ago
I'm in Victoria and the re-stumper used concrete stumps no ant caps.
And he just hung the stump from the bearer and concreted the footing in.
So technically the bearer is just sitting on the stump not attached except for a thin bit of wire that it was hung from.


Is this right???

Noticed today some stumps with bitumen on top of the stump then ant cap then bearer.

No nailing between the bearer and the stump

The bitumen must prevent rust via moisture under the cap?

The bitumen based product painted on to the top of the stump must make for a good termite deterrent as well. Anything thick and petroleum based they must hate chewing through?

The best stumps Ive seen were 225mm PVC pipes filled with concrete and 10mm tie down bolt up the side of the bearer.

Originally Posted by nev25

I had my house re-stumped a few years ago
I'm in Victoria and the re-stumper used concrete stumps no ant caps.
And he just hung the stump from the bearer and concreted the footing in.
So technically the bearer is just sitting on the stump not attached except for a thin bit of wire that it was hung from.


Is this right???

AS3660.1 says there is no requirement for an ant cap on concrete stumps as long as the stump has no path for ant to travel internally.

As for attachment, the concrete stump should have had a fixing protruding from the stump and through the bearer, then either bent over the bearer or fastened (AS1684.2).

Cheers
Purse

Just wondering if there is a standard way of fixing rectangular section, hollow steel joists to concrete stumps.
Thanks

My own version of BingoShelley's question about attaching stumps to bearers is - what is the standard way of attaching concrete stumps to rectangular section hollow steel bearers?
Appreciate any advice.

Do you already have concrete stumps installed? If not, I'd go for steel stumps and weld the stumps to the bearers.

Mick

Why would you need nails if you have GI strap? Whatever the logic is should probably be applied to stud and top/bottom plate connection shouldn't it? Imagine the outcry!