What tape should I use to tape seams of extruded polystyrene insulation sheets. Sheets are glued to exterior foundation perimeter so the tape must be self-adhesive, waterproof and can be used below grade. And where to get such tape since neither Lowes nor HD has it.
I used Tyvek tape on my Tuff-R sheets. It was exposed for 6 months before siding and worked great. Available at the home centers. I'm not sure about below grade, the spec sheet on the Tyvek web site does not mention it.
Dow Weathermate Construction tape.
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