How much will a 750mm can of expanding foam fill?

Question

will a can fill approx 1x3x1 ft box ?

thank you

Answer 1

about £7 from a builders merchants,

You would have to layer it up to fill a volume like that, but yes, one can will do the job.

Answer 2

I used this stuff to fill the voids between my (new) fresh water tanks and the bulheads. It expands VERY quickly and exherts a lot of pressure as it expands if it can't get out. So I'd take the advice above and fill your box in stages. And yes, I reckon one can will fill that space. It's not that expensive though.

Oh yes, don't get it on any "finished" surfaces. It's pretty well impossible to get off!