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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

: http://goldenglowpaints.com/PaintEstimator/SHAPE.htm

 

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.

CHAIN LINK FENCES

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.