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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

 

TRIANGLE,SQUARE,RECTANGLE,CYLINDER,SPHERE,CIRCLE

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.

 

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
*
Estimating Paint Requirements

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. Reference the chart below to get a good idea on the amount of paint you will need.


Asbestos Siding (Sealed)

350 sq. ft. per gallon

Asbestos Siding (Unsealed)

250 sq ft. per gallon

Board & Bat (Rough)

250 sq. ft. per gallon

Board & Bat (Smooth)

350 sq. ft. per gallon

Brick (Rough Sealed)

150 sq. ft. per gallon

Brick (Rough Unsealed)

100 sq. ft. per gallon

Brick (Smooth Sealed)

200 sq. ft. per gallon

Brick (Smooth Unsealed)

150 sq. ft. per gallon

Concrete Block (Filled)

250 sq. ft. per gallon

Concrete Block (Unfilled)

100 sq. ft. per gallon

Haydite Block (Filled)

200 sq. ft. per gallon

Haydite Block (Unfilled)

75 sq. ft. per gallon

Rough Sawed Siding

275 sq. ft. per gallon

Shake Shingles

200 sq. ft. per gallon

Smooth Concrete (Sealed)

400 sq. ft. per gallon

Smooth Concrete (Unsealed)

350 sq. ft. per gallon

Smooth Shingles

275 sq. ft. per gallon

Stucco Medium (Sealed)

150 sq. ft. per gallon

Stucco Medium (Unsealed)

100 sq. ft. per gallon

Stucco Rough (Sealed)

100 sq. ft. per gallon

Stucco Rough (Unsealed)

75 sq. ft. per 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.