Joist ends cap raised of steel

Ashworth1 · 29 Nov 2015

After speaking with my building inspector he said I can have my joists fitted in the internal wall of a cavity wall. After working out my levels the bottom of my joist needs to be 30 mm from the top of the rsj. Has anyone got any ideas of raising my joist 30mm . Was thinking of sitting them on a tile that's bedded on mortar?
With regards to the joist cap has anyone used them. They are 50x 225. My timbers are 47x 170. Can you cut the height down of the caps? Many thanks

CambridgeBrummie · 30 Nov 2015

Why not just add a softwood timber plate to the top of the RSJ?

seasickstevie · 30 Nov 2015

CambridgeBrummie said:
Why not just add a softwood timber plate to the top of the RSJ?

The joists are too LOW.

Newboy · 30 Nov 2015

Ashworth1 said:
the bottom of my joist needs to be 30 mm from the top of the rsj.

I read it as 30 mm packing required

seasickstevie · 30 Nov 2015

Ashworth1 said:
Has anyone got any ideas of raising my joist 30mm .

Oh! Perhaps it should read 'raising my RSJ'

Maybe Mr Ashworth can let us know.

Ashworth1 · 30 Nov 2015

Yea you are right they are too low. Thanks for your reply about putting wood on top of the rsj but pretty sure this will not be allowed as its for an outside wall which is why the joist have to be in caps. Was thinking of just putting 30 mm of metal shim in the bottom of the caps? Any other ideas would be great, thank you

^woody^ · 1 Dec 2015

Just pick them up with tile or slate.

You don't need joist caps, BTW. Just go around the joists with flexible mastic.

Or use hangers, which will be cheaper than caps.

Or bolt a timber to the wall and hang the joists off speedy hangers

Ashworth1 · 1 Dec 2015

Thanks woody, the bco will not let me put them in the wall unless I use caps and the brick layer is using bandstands off the timbers to finish 1st floor. To fix the timber to the wall and use hangers the bricklayer said he would need to lay another 6 courses of blocks above the height of the joists- which means scaffolding! Will probably do what you said - bed some tiles off the steel and sit the joist caps off them. Thanks you

^woody^ · 1 Dec 2015

Refer your inspector to NHBC Standards.

Joists can be built in to walls as long as care is taken to ensure air tightness (6.4 D3) and prevent passage of sound (6.3 D9)

Caps are not compulsory to meet the b/regs requirement.

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Joist ends cap raised of steel

Newboy

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