FREQUENTLY USED FORMULAS and FACTS for MASONRY CALCULATIONS

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CEMENT

Bag Sizes:
.

Portland Type I, II, III	94 lbs
Masonry Type N	70 lbs*	strength = 750 psi
Masonry Type S	75 lbs*	strength = 1800 psi
Masonry Type M	80 lbs*	strength = 2500 psi

*The variations in masonry weights and strengths are due to differences in the portland cement content of each type. Higher weights and strengths are the result of greater ratios of portland cement. All strength ratings assume proper ratios of sand added to each mix.

Mixing Formulas:

Concrete: 1 Cubic Yard = 1/2 yd Sand + 3/4 yd Gravel + 6 1/4 bags Portland or roughly, 3 parts Gravel + 2 parts Sand + 1 part Portland. This produces a mix with a strength of approx. 4800 psi

Masonry Cement: Single Bag Mix requires 18-20 shovels of sand.
This mix will lay up approx. 35 8" Block or 135 Brick

Stucco: Scratch Coat = 1 bag Portland + 3/4 bag Lime + 30-36 shovels screened Sand
Brown Coat = 1 bag Portland + 1 bag Lime + 38-42 shovels screened Sand
Finish Coat = 1 bag Portland + 2 bags Lime + 50-60 shovels screened Sand

These formulas will yield a coverage of approx.:
Scratch Coat: 130 sqft @ 1/2" thickness
Brown Coat: 325 sqft @ 1/4" thickness
Finish Coat: 450 sqft @ 1/4" thickness

SAND AND GRAVEL

Weights:
1 yd Sand = approx. 2300 lbs*, 27 cubic feet
1 ton Sand = approx. 25 cubic feet
1 yd Gravel = approx. 2300 lbs*, 27 cubic feet
1 ton Gravel = approx. 25 cubic feet
1 yd Stone Dust = approx. 2600 lbs*, 27 cubic feet
1 ton Stone Dust = approx. 22 cubic feet

*all weights assume dry conditions, weights will be higher when material is wet

Coverages:
1 yd of any aggregate will cover approx. 80 sq2 @ 4" depth
Number of Block per sqft of wall = (total sq2 of wall) x 1.125*
Number of Block per course = (length of course) x .75*
Courses of block required for height = (height of wall) x 1.5*

*all formulas assume standard 8" x 16" face block with 3/8" cement joints

Number of Brick per sq2 of wall = (total sq2 of wall) x 6.75* for std. brick
(total sq2 of wall) x 7.00* for mod. brick

*all formulas assume 3/8" cement joints