<< Hi webgang,
Take a look at this website
<A HREF="http://members.aol.com/EPenfield/page/Floatation.html">Floatation
Project
</A> , about putting foam in Catalina 22.
Judy B
>>
>From personal experience and experimentation:
You might be interested to know that styrofoam will float almost indefinitely
in salt water while pour-in and "Great Stuff" will absorb water quickly. In
about a week the pour in yellow orange foam will be half sunk.
I used pour-in foam in my old trihull to replace ribs and stringers. Foamed
it in completely under floor by drilling round 2" holes every 4 sq. ft. in
floor and pouring mixed foam in until it flowed out holes . Worked great for
about two years. Then, one day I noticed waterline was much lower while bilge
was dry. I drilled a hole low into false pour-in foamed floor pulling some
foam out with drill bit and found rain water in foam. It dripped out for a
month and never dried out. By the third year it had caused blisters in
bottom of hull.
Rain water had leaked in thru sides of hull and marine plywood (encapsulated
in epoxy resin) glassed joint collecting inside pour-in yellow-orange foam.
Styrofoam blocks are better.
Best
SF