This product can be applied at temperatures as low as 25 deg. and carries a 5 year limited warranty. Butyl rubber remains flexible across a large temperature range, good for window and door wrapping and flashing in cool to cold climates for better than normal flashing materials. Apply under house wrap, directly to the sheathing. WindowWrap Butyl is self-sealing around nails, screws, and staples. In cold climates it also makes a superior flashing around joints, vents, and other openings where standard materials lose flexibility and adhesion. Flat black face.