Stucco is a masonry material made from Portland cement, sand and water. Stucco is often used on the exterior of homes and walls to provide a durable textured finish. Tints and paints can be added to the stucco mix to give the material color prior to applying it on the walls. It can also be painted once it has dried. Traditionally three layers of stucco were applied to walls, the first layer being the scratch layer that was less porous with more binding capacity. The second layer was a brown coat and the third the hand-troweled finishing coat. New stucco mixtures can be applied with one coat.
Clean the wall with a damp towel. If the area is extremely dirty or has mold or mildew on the walls, use a power washer and scrub the wall with a soft bristled brush.
Measure the length and width of the wall. Cut the sheathing trim to fit the wall. The trim is a metal strip that is screwed to the wall and the sheathing is screwed to the strip. The sheath eliminates the need of a scratch coat of stucco because it creates a porous mesh that the stucco can adhere to. Position the trim over the wall framing it. Line the sheathing over the trim and screw the sheathing through the trim and into the wall.
Mix the stucco according to the manufacturer's label. You can mix the stucco in a large bucket or wheel barrow and add water to the mixture until it is the required consistency. It is best to create small batches at a time to move and use so the stucco won't dry in the mixing container.
There are brands of stucco that are designed specifically to go on in one coat. Check with your local home improvement store to purchase a product that meets these specifications.
Apply the stucco over the sheath with the trowel. Use random strokes in overlapping patterns to apply the mixture covering the sheath completely and create at least a 3/8-inch layer of stucco over it.
Work in small sections, mixing the stucco as you need it to keep it moist and fresh for application.