Abstract: A closure or sealing strip for interposition between corrugated or otherwise sinuous sheathing panels for walls or roofs or other building surfaces and a supporting or other frame element, the sealing strip comprising a laminated body in which the opposite longitudinal edges of the laminations are adapted to contact the sheathing panels and the frame element respectively, and in which the laminations are composed of a resilient polymer and have relatively dense surface skins and relatively porous interior portions. Where the strips are to support relatively heavy loads, one or more of the laminations may be of substantially greater density than the others. The sealing strips are provided with interlocking means at their ends, such as dovetail connections, whereby a number of the strips may be readily joined together in endwise relationship.