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VonTed 03-01-2013 02:56 PM

Sheathing tape on reclaimed XPS
I decided to go the route of using reclaimed XPS for my interior insulation. (2" XPS). After washing, scrubbing and cleaning these panels as best I could they are still quite dirty - but I don't think I can reasonably get them any cleaner. I don't particularly mind the grime because they will all be behind a wall anyway...

However - how "sticky" should the sheathing tape be when applied? I am concerned that the dirt and dust left may leave me with an inadequate seal after applying the sheathing tape. I just tested a piece it once applied it seems to lift off easier than I was imagining.

This is a "clean panel" - I have cleaned it up a bit better than seen, but it does give you an idea of what the panels look like.

And this is the tape I bought.

Gary in WA 03-01-2013 08:10 PM

Try some fiberglass tape with furnace mastic over it or canned foam as the tape tends to work loose from the foamboard over time;
Though aged may make a difference...


VonTed 03-01-2013 08:13 PM

Go with just foam or foam over the tape? Or could I skip the tape if I caulk or foam the seams and edges?

Gary in WA 03-02-2013 10:44 PM

Canned foam alone at the edges, including top/bottom to completely air-seal the concrete from the basement air against condensation. As mastic/mesh tape is easier to see any pinholes in front of you, I suggested it over canned foam. Remember to fire-stop every 10' horizontally and at the ceiling/floor level to stop fire from getting in any floor joist cavities;
Use positive fasteners through f.b. into concrete. Add 1/2 f.b. under wood p.t. (if required by local AHJ) plate (for thermal/air/capillary break), air-seal/insulate the wood rim joists;

ADA the drywall;


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