high profile section 30 includes proximate the bottom of the side 37 a trimmable flange portion 33 including a multiplicity of trimming sections 33 f which may be trimmed for example in relation to the illustrations of fig8 a and 8b the trimmable flange 33 includes ports or openings 33 x for receiving fasteners 8 for anchoring the high profile section 30 proximate the roof u201c r u201d this installation is without a curb so the sealant 6 is placed adjacent the opening adjacent framing members r 1 wherein the bottom 33 a of the trimmable flange 33 includes a multiplicity of ribs to accept the silicone when the downwardly extending appendage 33 b butts the drywall exterior surface as seen in fig2 b the drywall 4 u2032 therefore having a thickness t 3 is therefore covered proximate the top thereof to prevent the accumulation of the debris unlike that as shown in fig4 by a supplementary molding 40 shown in fig2 c including a screw port 42 should it be required although it is not normally required and a pocket 41 for engaging the downwardly extending thumb portion 33 e disposed proximate the bottom of the extrusion 30 proximate the side 38 thereof the pocket 41 therefore is for receipt of the thumb portion 33 e which snap fits into.