How to Mix Stucco for a House

Exterior stucco can last for decades.

Stucco is one of the most durable, and most forgiving, of exterior coats for construction. The combination of cement, lime, sand and water creates a sturdy outdoor plaster that can be enhanced with mineral pigments for a variety of colors. Stucco's thick texture and consistency permits a certain amount of creativity, as swirls and patterns can be created during application. Properly applied stucco can last for many decades with minor cosmetic maintenance and occasional pressure washing. Premixed stucco is available in most home improvement centers, but it is easy and much more economical to mix your own.

Things You'll Need

• White Portland cement
• Hydrated lime
• Wheelbarrow
• Shovel
• Sand
• Water

Instructions

1. Place one part dry white Portland cement into a wheelbarrow.

2. Add one-half to one part hydrated lime. Stir well with a shovel to combine.

3. Pour in two and one-half to three parts sand and blend again thoroughly.

4. Moisten the ingredients in the wheelbarrow with just enough water to make a thick mixture.

5. Check the consistency of the stucco by placing a small amount in the palm of your hand. Try to form the wet stucco into a shape such as a sphere, a flat disc, or a cylinder. Place the shape on a hard, flat surface. If it retains its shape, it is ready to be used.

Tips & Warnings

• Mix the stucco away from direct heat and sunlight to prevent its drying out too quickly.

• Use protective goggles to protect your eyes from any loose debris or splashing while you are mixing the stucco ingredients.

• Avoid the temptation to create large amounts of stucco at one time. Stucco dries quickly and can be rehydrated only once, with small amounts of water. Mix only as much as you can apply within an hour or so. You may find it helpful to cover the remaining stucco in the wheelbarrow with a heavy drop cloth or some other cover to slow the drying process as you work.

References

• Ask the Builder: Cement Stucco Foundation Finish