D260 Wall fillet (pack of 5)120 x 60 x 80mm 450g D260 is a fillet trim used to butt up against walls. It also provides an expansion gap around the edge of the roof. Sit the trim with the vertical against the wall, and the horizontal face on the deck. To join two lengths together simply overlap (by 50mm) using Fix ALL adhesive to bond together, then tape and resin over the joint with woven tape. Nail the D trim to the horizontal deck.