attach frames to slab

**Metung** · 10th May 2008, 11:09 AM

One other small point, I presume you will have tie downs - metal straps that go under/over the bottom and top plate and up/down either side of a stud. Seems they are normally located on studs either side of any external frame opening, namely doors and windows and external corners. I regret not having rebated the stud on the internal side because there is generally a small bump in the plaster where the ties occur. Nobody else probably notices but I certainly do.

**silentC** · 12th May 2008, 10:09 AM

There's two different things being talked about here: one is fixing the bottom plate to the slab, and the nominal fixing for that is a concrete nail every 1200mm. The other is tie-down and that needs to be an anchor such as a bolt embedded in the slab or similar.

The tie-down is continuous through the wall frame to the trusses and it is spaced at 3000mm centres for trusses spanning 1200mm and 1800mm centres for spans greater than 1200mm but less than 16000mm (as per the framing manual). It can be separate fixings, like a bolt for slab to bottom plate, GI strap for bottom plate to stud, GI strap for stud to top plate and framing anchor for top plate to truss, or you can have a bolt/rod all the way up from the footing to the top plate as per Bazza's suggestion.

Dynabolts are sure to be OK for fixing the wall frame down (probably overkill) but possibly not for tie down. You're probably going to need more than concrete nails on internal bracing walls.

My engineering detail included tie-down instructions. Strap-braced walls need GI strap or something at the top and bottom plate connections too. Not sure about ply bracing units, since they fix to the top and bottom plate as well.

**Metung** · 12th May 2008, 10:48 PM

Silent, there was only one thing being talked about till I opened my big trap and tried to offer a little bit of extra advice.

I don't dispute what you say, except for the missing 0's in some of your spans, but it has made me wonder whether Craig is aware that there is more to putting the frame up than just fixing the bottom plate to the slab. If so, then he might like to explore this further.

**silentC** · 13th May 2008, 09:48 AM

My first post was about tie down. Seemed people were just talking about fixing the bottom plate (which to be fair is the question that was asked) but obviously you need to do more than just whack in a concrete nail every 1200mm.

the missing 0's in some of your spans

Shouldn't be any, just copied that straight from the framing manual which is on my desk in front of me. Which ones did I miss?

there is more to putting the frame up than just fixing the bottom plate to the slab

Yeah I just wanted to make that clear.

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