Re: where can I find flotation foam in Canada (Ontario)
Telmanmn, I wouldn't say extruded foam is impervious to water. It's quite resistant but will soak up water like a sponge if kept under water. When used on foundations the water is meant to drain away to the weeping tile so the insulation is not under pressure from the water. When used on inverted or upside down roofs (flat roofs with the insulation on top of the roofing membrane) this insulation often would stick to asphalt membranes and also be held down with the gravel ballast. If water accumulated on the roof, the insulation would eventually soak up water and be so heavy it would break when you try to carry a piece.<br />In my opinion, you're just making a bad situation worse using layers of board stock all cut to fit. There's no support, there's lots of gaps for water to accumulate and go moldy, they will move around and wear and move around more. I pulled board insulation out of my boat and it was all broken and this way and that way. What a mess! But hey, that's just one man's experience.<br />Classic
