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Posted by George Pontis on August 13, 2005, 8:31 pm
precisionmachinist@hotmail.com says...
>
> > The(asphault) concrete expansion joint rotts away about every 3 yrs.
> >
> > The gap is about 2 1/2 inches wide double drive, I am thinking of
> removeing
> > it and filling it with that spray can foam they use to seal leaks around
> > windows and doors to drafts out.
> >
> > What do ya think?
> >
>
> Bad idea..I almost almost guarantee you that polyurethane foam won't last
> more than one season in any climate.
>
> Suggest fill it about 1/2 the way up with sand and then top seal it with
> someting that's designed specifically for the purpose--find some kinda
> rubbery shit that will expand / contract with the season but yet still keeps
> water from getting in there, and that is also relatively stable to sunlight.
>
As of 4-5 years ago one version of this product was called "DecoSeal". Sealing
expansion joints around a swimming pool was a common use of this material. It
was
(is ?) a two part compound, mixed just prior to use. The stuff flows pretty
well,
and in fact that can be a problem if the joints that you are sealing have much
of
a slope. Once it cures it is very durable! If you do find it, be sure to mix
thoroughly just as the instructions state.
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