an apparatus for insertion between a masonry element at least partially defining a perimeter of an opening in an architectural structure and a frame surrounding the perimeter and having at least one surface includes a sponge structure adapted to rest against the frame and having at least one surface . the apparatus further includes a rigid member affixed to the sponge structure and adapted to rest against the masonry element and a coupling element affixed to the sponge structure and adapted to be coupled to a surface of the frame . in another aspect of this embodiment , the surface of the sponge structure is adapted to adhere to a sealant . the sponge structure may include closed cell blended epdm neoprene .