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 Find the Area SF

circumference = around

: Height x circumference

: then you take  and divide circumference by 3.14

: the you divide that answer by 2

: then you X the answer by 2

: and then X that by 3.14 and you have your answer

: for the top portion of the cylinder

COVERAGE FOR DIFFERENT SHAPES

 TRIANGLE To find the number of sq.ft. in any shape triangle or 3 sided surface, multiply the height by the width and divide the total by 2. 40� height x 50� width 1,000 sq.ft. 50� 2,000 sq.ft. 2 2,000 SQUARE Multiply the base measurement in feet times the height in feet. 40� 40� x 40� = 1.600 sq.ft. 40� RECTANGLE Multiply the base measurement in feet times the height in feet. 20� 40� x 40� = 800 sq.ft. 40� CYLINDER When circumference (distance around cylinder) is known, mul- tiply height by circumference. 157� circumference x 100� height 15,700 sq.ft. 100� 157� When diameter (distance across) is known, multiply diameter by 3.1416. This gives circum- ference. Then multiply by height. 3.1416 157� circumference x 50 diameter x 100� height 157.0800 feet 15,700 sq.ft. NOTE: Figures do not include end area. See circle. SPHERE To find the number of sq.ft. of a sphere or ball, multiply the diameter (distance across) by itself and then multiply this total by 3.1416. If you haven�t the diameter, you can find it by measuring the circumstance and multiplying it by .31831. 50� diameter 2,5000 x50� diameter x 3.1416 2,500 7,854.0000 sq.ft. CIRCLE To find the number of sq. ft. In a circle, multiply the diameter (distance across) by itself and then multiply this total by .7854 50� 50� diameter 2,5000 x50� diameter x .7854 2,500 1,969 sq.ft.  Figure the square foot area as a solid and double it to allow for both sides. For spray, this will be fairly accurate since overspray must be considered. For roller, the coverage indicated in the product data sheets should be increased.

WALLS -- When figuring the square foot area, openings of less than 100 square feet should not be deducted.

OPEN WEB STEEL JOISTS Original equipment manufacturers and fabricators generally dip these joists, as a first or shop coat. On all repaint work, by spray, these manufacturers recommend the paint be estimated by thinking of the joist as a solid rather than open web. Double for both sides.

STACKS To compute the square foot area of a stack multiply height (B) by the average diameter (A) and multiply that total by 3.

EXAMPLE: Diameter of stack at the top � 5 feet.

Diameter of stack at the bottom � 15 feet.

( 2 /( 5 + 15)

Average diameter = 10 feet.

Height 60 feet.

60 x 10 = 600.

600 x 3 = 1800 square feet of surface area.

DOWNSPOUTS & GUTTERS � Measure the circumference in inches. To figure square feet, divide the circumference by 12 and multiply by total length in feet. Double this figure if the inside is to be painted.

PICKET FENCE � Multiply the height by the length and multiply the result by four.

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ESTIMATING PAINT REQUIREMENTS

OVER VARIOUS SURFACES

MOST EXTERIOR PRODUCTS WILL AVERAGE 400 TO 450 SQUARE FEET PER GALLON ON SMOOTH SURFACES; HOWEVER, SOME SURFACES, DUE TO IRREGULARITY OR ROUGHNESS OF THE SURFACE, WILL TAKE CONSIDERABLY MORE PAINT.

The following is an approximate estimate over various irregular surfaces.

 ROUGH SAWED SIDING 275 sq. ft./gallon ASBESTOS SIDING (UNSEALED) 250 sq. ft./gallon ASBESTOS SIDING (SEALED) 350 sq. ft./gallon BOARD & BAT (SMOOTH) 350 sq. ft./gallon BOARD & BAT (ROUGH) 250 sq. ft./gallon SMOOTH SHINGLES 275 sq. ft./gallon SHAKE SHINGLES 200 sq. ft./gallon SMOOTH CONCRETE (UNSEALED) 350 sq. ft./gallon SMOOTH CONCRETE (SEALED) 400 sq. ft./gallon CONCRETE BLOCK (UNFILLED) 100 sq. ft./gallon CONCRETE BLOCK (FILLED) 250 sq. ft./gallon HAYDITE BLOCK (UNFILLED) 75 sq. ft./gallon HAYDITE BLOCK (FILLED) 200 sq. ft./gallon STUCCO MEDIUM (UNSEALED) 100 sq. ft./gallon STUCCO MEDIUM (SEALED) 150 sq. ft./gallon STUCCO ROUGH (SEALED) 75 sq. ft./gallon STUCCO ROUGH (SEALED) 100 sq. ft./gallon BRICK SMOOTH (UNSEALED) 150 sq. ft./gallon BRICK SMOOTH (SEALED) 200 sq. ft./gallon BRICK ROUGH (UNSEALED) 100 sq. ft./gallon BRICK ROUGH (SEALED) 150 sq. ft./gallon

It is advisable when estimating the square footage in the average residence to include areas such as windows, doors, etc. in the final figure. Deduct these areas only when they comprise a more than average percentage of the total area.