6" Waterproofing Fiberglass mesh tape roll - the most recommended for Laticrete Hydro Barrier, Redgard Exact same product as seen on my You-Tube videos about shower waterproofing ! ! ! The very best fiberglass mesh tape when waterproofing shower walls, shower pan & curb, niche etc. Waterproofing installations at changes in-plane and substrate joints Excellent for tub surround waterproofing and tile backer joints ! ! Very flexible and strong - alkali resistant