![]() ![]() ![]() ![]() Thin sections create stress where cracks can occur. Consistent stucco thickness is required to distribute the stress equally.If the framer hasn’t provided the gapping, then the lather (presuming he is putting up the WRB) must ensure it is done before the WRB goes on. This is why there is the requirement to provide a 1/8-inch gap between sheets of wood-based sheathing. As a result, there would be increased force imposed on the stucco and the stucco would have to crack. Doesn’t sound like much? Let’s say we have a 60 foot wall and 20 percent humidity change-the expansion of the sheathing would be 0.3 inches. Wood based sheathing: plywood expands 0.0002 in/in for each 10 percent change in humidity.Additional moist curing may be required depending on wind, temperature, and humidity conditions. This continued moisture allows the hydration of the Portland cement to continue and for the stucco to achieve the desired strength. Fine water spray should be applied in morning and evening. Stucco should be kept moist for a minimum of 48 hours. Moist curing: good moist curing is critical to minimize shrinkage and to achieve harder, stronger stucco, especially in hot windy conditions.The scratch coat needs to be the richest cementitious mix, followed by weaker brown coat, and then the finish coat being the weakest. Remember that these are volumetric ratios, and that the lime counts as part of the cement portion. Sand to cementitious ratios need to be maintained per ASTM C926. Proper mix and application: good quality, properly sized, clean sand is essential for quality stucco.Roll on one to two coats, as necessary, and follow the manufacturer’s guidance with regard to drying time between coats. Apply paint as you did primer, with a synthetic brush for cutting in, and a large napped roller for rolling the walls. If a gallon of paint says it gives you 400 square feet of coverage, assume you’ll cover 200 square feet of stucco. Step 5ĭue to its texture, a stucco finish has a much greater overall surface area than a flat wall, so you’ll need more paint than you think to achieve adequate coverage. Follow the manufacturer’s guidance on drying times between coats. It is better to apply two thinner coats than one thick coat, to avoid paint pooling in crevices and causing drips. You’ll probably need more than one coat for complete coverage. A large napped roller makes for easier application into all the nooks and crannies. Acrylic primers and paints are preferred because their binders mean better adherence to the uneven stucco finish. Prime with a high quality acrylic primer, using a synthetic brush to cut in, and a large napped roller to roll it on. You may need to wait for up to 10 days before you can paint. Pay attention to the manufacturer’s suggested curing time on your patching compound. Remove the loose stucco with a putty knife, and repair with stucco patching compound. Cracks larger than 1/16-inch-wide will require a patch. Step 3įix any small cracks with masonry caulk. Be sure to rinse thoroughly, and allow to dry completely for 24 hours before you begin to caulk and repair. Deeply grooved exteriors can be power washed, if necessary, to get dirt out of the crevices. If your walls have grease or grime or mildew build-up, apply an appropriate cleaner, following manufacturer’s directions. Interior walls may be more easily vacuumed using a dusting attachment. For most exterior stucco, this simply requires a thorough going over with a stiff brush or push broom. ![]()
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