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Broco Stucco

Basic use

Broco Stucco Cement will produce a plaster mortar designed “M” or “FM” as defined in ASTM C-926 “Standard Specification for Application of Portland Cement-Based Plaster.”


Broco Stucco Cement contains a water-repellent agent which is interground with the cement during finish grinding. No other additives are necessary.

When stucco is to be applied to smooth, non-porous surfaces to meet the thickness requirements of ASTM C-926, we recommend a quality bonding agent be used to ensure adequate adhesion.


Broco Stucco Cement is available in 79 pound moisture resistant bags and in bulk containers transported by truck or rail.

Plaster Coat Sand Volume
Parts Shovels
Scratch Coat 2-1/2 - 4 17 - 28
Brown Coat 3 - 5 21 - 35
Finish Coat 2-1/2 - 3 17 - 21
Materials required per 100 sq. ft. * (1:3 Mix)
Thickness Broco Stucco Cement Bags Sand Cubic Feet
1/2” 2 6
5/8” 2.5 7.5
3/4” 3 9
1” 3.5 10.5

*Best estimate based on 1 cubic foot of damp loose sand containing 80 lbs. of dry sand meeting ASTM C-897. No allowance for waste.


Add two thirds of the water first, then one half of the sand and then the Broco Stucco Cement. Add the rest of the sand and water to a desired consistency and mix for no less than five full minutes. A mixing time from five to ten minutes will increase the yield of your mortar.

The stucco may be hand or machine applied. The number of coats and the thickness of the stucco should be consistent with industry standards.

Proportions for Broco Stucco

One bag of Broco Stucco when mixed with the recommended volume of sand (ASTM C-897) will produce a stucco mix that will comply with the proportion requirements for ASTM C-926, "Standard Specification for Application of Portland Cement-Based Plaster."


A light fogging with water two times a day for three days will preserve the appearance of the wall while minimizing drying shrinkage, cracking and its associated debonding. Excessive drying conditions, especially on exposed southwest walls, will require curing immediately following each coat to prevent drying shrinkage cracking.

We recommend that users follow procedures as outlined in ASTM C-926, “Standard Specification for Application of Portland Cement-Based Plaster.”


Freshly mixed cement, mortar, grout or concrete may cause minor skin irritation. Avoid direct contact where possible and wash exposed skin areas promptly with water.


CEMEX’s Portland Cements can be ordered by contacting at CEMEX Customer Care at:

Customer Care  |   1-800-99-CEMEX


CEMEX, Inc. guarantees Broco Stucco Cement when shipped from our mill or terminals to meet the current requirements of ASTM C-1328, “Standard Specification for Plastic (Stucco) Cement” and ASTM C-91, “Standard Specification for Masonry.”


CEMEX warrants that the products identified are in accordance with the appropriate current ASTM and Federal Specifications. No one is authorized to make any modifications or addition to this warranty. CEMEX makes no warranty or representation, either expressed or implied with respect to this product, and disclaims any implied warranty of merchantability or fitness for a particular purpose.

As CEMEX has no control over the other ingredients mixed with this product or the final application, CEMEX does not and cannot warrant the finished work.

In no event shall CEMEX be liable for direct, indirect, special, incidental or consequential damages arising out of the use of this product, even if advised of the possibility of such damages. In no case shall CEMEX’s liability exceed the purchase price of this product.

Technical Services Personnel

CEMEX personnel are available to provide technical assistance by contacting Customer Care at: 1-800-99-CEMEX (1-800-992-3639).


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