I recently encountered York Manufacturing’s 304SS hybrid peel-and-stick flashing at a trade show. It has a butyl-adhesive backing and a 304 stainless-steel face. It seems ideal for such uses as deck-ledger flashing or site-built sill pans for doors and windows. According to the manufacturer, it has a puncture-resistance rating of 2500 psi, as opposed to 40 psi for regular 40-mil rubberized-asphalt peel-and-stick. That would give me some peace of mind when sliding a couple of hundred pounds of door or window into place.
Another advantage 304SS offers is the ability to hold up under unlimited UV exposure. Most standard membranes are rated for 30 days or so. The manufacturer claims 304SS is compatible with most other building materials, from vinyl window flanges to portland-cement stucco. Even so, it might not be the best choice in a coastal environment. David Carroll, senior technical manager, says that within 2000 ft. of salt water, 316 stainless steel should be used. (Carroll expects the company to offer a 316 version later in 2014.) York offers a lifetime warranty, and the cost of the material is about $1.60 per sq. ft.
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