Example Replacement Procedure: Recessed Window with Stucco Cladding
Cut back the exterior cladding and remove the existing window. Remove interior trim and prepare the rough opening as needed.
Install a strip of metal flashing on the exterior sheathing below the sill. It should be shaped
to divert water onto the stucco cladding.
Install foil-faced self-adhered membrane on all four sides of the opening covering the rough opening framing, exterior sheathing and sheathing membrane, if present. The membrane placed on the sill should extend over the metal flashing. Install all membranes in a "shingle lapped" fashion, and ensure all four corners are air- and water-tight by using prefabricated corner pieces or membrane gussets. Place sealant beads where the self adhered membrane meets the stucco cladding on either side of the window.
Place the replacement window on shims, and fasten in place as required. Fasteners should be located so as not to penetrate the sill membrane at the exterior edge.
Install backer rod and a continuous bead of sealant between the interior edges of the window and the self-adhered membrane. This provides air and water tightness.
Intermittent shims should be used to fur out the window trim to allow for incidental
water to drain onto the stucco cladding at the window sill. Metal drip edge flashings should be installed to protect the horizontal edges of the trim.
Seal the exterior edges of the window to the sill flashing and trim, with intermittent weep holes at the head to allow drainage.
Seal the head trim flashing to the stucco cladding.
Place backer rod and sealant between the vertical window trim and the stucco cladding.
