Building custom seats using 40 and 50 mm thick wedi building boards

Measure and cut the bench pieces off a wedi 50 mm thick Building Board and dry fit. When installing a corner seat, the board edges are mitered for a tight fit. To achieve a slope, the part’s upper ends are cut down with a slight angle towards the front of the bench. Optionally, create a pitch using wedi joint sealant as a ‘wet shim‘.

The wedi parts are adhered to the wall using thinset mortar or wedi Joint Sealant. Adjoining parts are glued together using wedi Joint Sealant continuously applied along all foam edges of a board part. Excess is spread flat over the seams using a putty knife. Where the part’s backs meet the wedi wall, modified thinset mortar is used in a full contact surface bed. Once the bench is built, a final bead of wedi Joint Sealant is
applied to safely seal all seams to the wedi wall. The vertical front part of the bench will show a small gap to the pitched floor. Please fill with thinset mortar and alkali resistant fiberglass mesh tape by wedi, applied over this seam.

Alternatively, benches and seats are offered as prefabricated units made by wedi. For longer or larger benches built from our 50 mm building board, always install one spacer every 400 mm in either direction. Cover exposed blue foam board edges with wedi joint sealant or a strip of wedi Building Board so even small tiles can be adhered safely.