Face-Sealed Stucco on a Wind-Driven Elevation

The proposed scope treats symptoms. A patch and recoat over a wall with 22 to 28 percent moisture readings and no drainage plane can trap water and drive it deeper into the OSB. I would require a moisture grid across the west elevation using both pin and pinless meters, with readings referenced to dry standard and mapped by elevation and height. I would require at least four destructive openings: one at a crack, one at a window jamb, one at the base above the missing weep screed, and one at a floor-line control joint. Each opening should verify WRB continuity, sheathing condition, insulation, and whether water is draining or accumulating. I would require inspection of two window openings for sill pan, flashing, and sealant adhesion, plus a field water test of one window and one wall field by a qualified technician. Interior investigation should check RH, dew point, and whether the musty odor is from wall cavities or below-grade spaces. The key distinction is condensation versus rain intrusion. Without that evidence, neither the seller's scope nor a full re-clad recommendation is defensible.

The minimum repair must restore drainage and flashing, not just a surface coating. Remove stucco and sheathing as needed to sound substrate. Install a code-compliant water-resistive barrier with proper laps and a drainage mat or 3/8-inch furring to create a clear drainage plane. Terminate the stucco at a weep screed at the base, maintain a minimum clearance above grade and roof surfaces, and use casing beads and control joints at floor lines and openings. At windows, install a sloped sill with a self-adhered sill pan, end dams, and a back dam; integrate jamb and head flashing with the WRB in shingle fashion; use a head flashing with end dams and drip. Sealant is secondary, not the primary barrier. Because the building lacks a drainage plane throughout, localized patching creates transitions where water can be redirected into adjacent assemblies. If the owner will not re-clad the full elevation, the repair should at least create a defined drainage cavity around each opening and at the base, with a written boundary condition. Otherwise, a full re-clad of the west elevation is the more durable choice.

Report language should be factual and tied to measurements and openings. For example: At the west elevation, moisture meter readings of 22 to 28 percent were recorded at six of eight probe locations at the wall base, with efflorescence and crack patterns at floor lines. Two ground-floor units have musty odor and paint blistering below three windows. The wall assembly observed at openings consists of hard-coat stucco over one layer of 15-pound felt with no drainage mat and no weep screed. Windows are face-mounted with no sill pan and failed sealant. These conditions are consistent with rain water entering at cracks, window perimeters, and the wall base, and with limited drying. Patching cracks and recoating will not correct the absence of a drainage plane or window flashing and may reduce drying. Recommendation: obtain invasive evaluation by a qualified stucco and water-proofing contractor, including moisture mapping and at least four openings, before closing. Budget for either a full drainage-plane repair of the west elevation or a documented perimeter repair with defined boundaries. Do not represent the wall as watertight until repairs and water testing are complete.