Repair joist. Acro prop while I do it?

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17 Feb 2006
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House built in 1927. Semi. 4 foot space under ground floor.

Just doing some tidying up. Notice a cracked joist. The timber looks completely sound, as does all the timber under the house. It's a sort of zig zag split from top to bottom. But there is lateral displacement, i.e. if I look at the joist from underneath the 2 halves of the joist are out of line, by a couple of millis. So I think the split goes all the way through.

I'll repair. What do I do? I'm guessing stainless steel coach screws to fix another joist the same size to the side of the existing? Or coach bolts and nuts? Do I need to prop anything while I do it to get the joist back up to level?

Thanks, Mike
 
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picture will help
if its fully along and following the grain its unlikley to effect the strength
 
Sister joist, no need to prop unless there has been significant movement.
 

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