Measure from the window frame to the finished wall face, then add the required front projection. Check both ends and the centre because reveals may not be parallel.
Interior Sill Boards for Clean Window Reveals
Window Boards at MacBlair forms the visible interior sill at the base of a window opening, covering the reveal and providing a durable finishing surface. The confirmed range covers machined boards with finished front edges that can be cut to suit opening width, reveal depth and the required projection. Order against measured quantities and check the listed unit, length and pack information before work starts. timber for interior finishing provides context for the wider project.
Compare board depth, length, thickness, edge profile, material, primed condition and moisture exposure around the window. Measure the reveal at several points and include the front projection plus any side horns. Check that the board will meet plaster, lining and frame details without blocking vents or drainage paths. Where the task continues into another part of the build, mouldings for detailed trim can coordinate compatible materials.
Before work begins, resolve leaks and condensation, make the supporting base sound and level, and dry-fit a template where walls or window angles are irregular. Cut cleanly with full support, seal exposed edges as required, bed or fix the board without twisting it and maintain movement clearances. Measure carefully and allow for cutting or fitting waste. Test the method on a short length or inconspicuous area when appearance matters. wall ventilation products may support the next practical stage.
Window Boards performs best when the surrounding reveal stays dry and the finish is protected from persistent condensation. Fill junctions with compatible materials, prime porous cuts and apply the specified coating. Water damage should be traced to its cause rather than hidden beneath a new board. Follow product instructions, drawings and trade guidance where structure, fire, moisture or exterior exposure affects the choice. Store remaining material as directed.
Window Boareds FAQs
Horns are the short projections that can extend beyond each side of the reveal. Their size is a design choice, but both sides should be set out from the actual opening.
Only when the board grade and finish suit the conditions. Persistent condensation should be reduced first, and every cut edge needs the sealing system specified for the material.
They need continuous, level support and a fixing or adhesive method compatible with the board and background. Avoid pulling the board down onto an uneven base.
Replace it when swelling, decay or loss of support prevents a sound repair. Find and correct leaks, failed seals or condensation before fitting the new board.