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
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