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Estimating Vinyl Siding
Mar 16, 2018

Estimating Vinyl Siding
To estimate the amount of siding and accessories you'll need: 

1. Measure the perimeter (P) in feet around your house, then measure the height from bottom of the siding to the eaves (EH). Multiply the perimeter by the height to find the main square footage (Fig. 2). P x EH=Main SF. 

2. Measure the height of esch gable (GH) and the width of the gable wall at the eaves (GW). Multiply the gable height by the gable width, and divide by two to find the square footage of each gable (Fig. 2). (GW x GH) divided by 2 = Gable SF for each gable. 

3. Add the main square footage to the total square footage of all gable. Main SF + (Sum of gable SF) = Gross SF 

4. Measure the height (OH) and width (OW) of all major openings - garage doors, patio doors and large windows. Multiply the height by the width to find the square footage of each, then subtract from the gross square footage to find the net square footage, OH x OW = Opening SF for each opening Gross SF - (Sum of all Opening SF) = Net SF. 

5. Divide the net square footage by 100 to find the number of squares of siding you'll need. Net SF @ 1 00 = # of squares 

6. Count the number of outside corners, and find the length of each. Total the linear feet of outside corner and divide by 10 to find the number of outside corners. Repeat the process for the inside corners. 

7. Divide the perimeter by the length of each starter strip to find the number of lengths you'll need. 

8. Measure the perimeter linear feet around all doors and windows, and the sloped length of all gables. Total the linear feet and divide by the length of each J-hannel to find the number of lengths you'll need. 

9. Measure the width of all windows and the length of all eaves. Divide by the length of each utility trim to find the number of lengths you'll need.