Building Standards; Getting It Right!
Apr 02, 2015 7:03 am
Our build is nearing completion and I have a bit of a doubt. The expansion joints in the external walls have a soft foam like filler but there is no urethane sealant on the expansion joints.
Does anyone know if its mandated by building codes to seal the expansion joints with a urethane sealant?
Re: Urethane sealant in expansion joints mandatory?2
Apr 02, 2015 7:53 am
I doubt it. Just about every expansion join we did in brick walls etc were just the 75 or 100mm foam strip like Abelflex or the bitumen impregnated felt which was installed flush with the face of the brickwork. No sealant to cover the join and I remember that almost none of the details on the plans showed sealant being used.
Mind you if that is what's shown on your detailing, then that is how they should do it.
Re: Urethane sealant in expansion joints mandatory?4
Apr 28, 2015 9:07 am
Often they will put a foam backing rod into the AJ. That way when they fill with flexible sealant it they don't waste too much and squirt the full brick width.
It is there to seal the crack, doesn't form a structural join.
Personally I prefer the sealant, keeps it looking cleaner and creepy crawlies from nesting in small gaps.
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I would talk to them and ask them why, then I recommend getting an independent building inspector to check for that and other issues.