http://www2.dupont.com/Tyvek_Weatherization/en_US/products/residential/resi_seam_tape.html You can also use this stuff, it’s similar, http://www.amazon.com/exec/obidos/ASIN/B002KM1APU/homeconstimpr-20 Drop ceiling are better just for future access. Drywall ceilings will perform just fine...
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