The RIAD trim is a fillet of trim for use against abutting walls. It will also provide expansion and perimeter ventilation and is compatible with RIAC2 and RIAC3 universal corners. Place the RIAD trim against the vertical face and push down diagonally into the corner until the trim fits snugly. Where the RIAD trim needs to be joined it should be bonded with a strip polyurethane adhesive and bandaged together. The RIAC trim is usually fitted into a bed joint of the brickwork or a 35/50mm (depending on the trim type) deep chase cut out with an angle grinder fitted with a mortar chase disc. Apply polyurethane adhesive to the back of the RIAC trim every 300mm. Fit the trim into the slot and press firmly back to the wall to overlap the RIAD trim. Apply a clear silicone sealant along the length of the trim into the slot to seal the trim in. A smooth finish can be obtained by wiping the sealant with a moistened finger.