To determine how much siding you need for a 20×20 garage, you first need to calculate the total surface area of the walls. A standard garage has four walls, so you’ll calculate the area of each wall and then add them together.

Assuming the garage has a standard height of 8 feet: calculate the area of one wall: Area = Height (8 feet) x Length (20 feet) = 160 square feet. Since there are four walls, multiply the area of one wall by 4: Total Siding Area = 4 x 160 square feet = 640 square feet

So, you would need 640 square feet of siding to cover all the walls of your 20×20 garage. However, it’s a good practice to buy a little extra for any mistakes or future repairs.

A 20×20 garage will measure 20 feet in width by 20 feet in length. The average garage wall height is an 8 foot high. It has door opening is 16 wide by 7 feet tall used for 2 car parking. If the garage has gable ends, measure each one to determine how much siding you will need.

If you want to make single or double car garage or for your car parking, there is a lots of questions comes in mind how much siding do i need for a 20×20 garage to cover exterior surface. To get total amount of siding in squares, divide the total square footage of 20×20 garage (area of external walls- area of opening) by 100.

Garage dimensions: on average, a single car garage is 12 feet wide and 22 feet long and 7 to 8 feet in height. Other common sizes are 14 feet x 22 feet, 16 feet x 20 feet, and 14 feet x 20 feet. And 2 car dimensions is 24 feet ×24 feet and 8 foot in height. These bigger one-car garages are great for storage space in addition to the space for your vehicle.

Siding materials generally measured in “squares”. One square of siding equals 100 square feet, so multiply height x width of exterior wall, then divide by 100 for total “squares of siding you have needed”. You can select different materials on different walls. Do not subtract opening area of door and window, unless there is a very large opening.

For 20×20 garage installation you have need different materials like wood studs, header, bottom plate, top plate, roof shingles, drywall for interior wall and siding to cover exterior surface. You have many option of materials used for siding like plywood of 1/2″ thickness of 4×8 sheets and Vinyl siding measure in square.

In this article article we know about “how much siding do i need for a 20×20 garage. Amount of siding required for a 20 by 20 feet garage will depend on square footage of each siding panel, height of wall, and area of opening, area of walls and gable end.

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**How much siding do i need for a 20×20 garage**

To calculate how much siding do you need, measure the height and width of each side of exterior wall. For each exterior wall area, multiply height times width, then add all the area of exterior wall to get total square footage. Divide the square footage by 100 to get the number of squares of siding needed for the wall. Always add 10% extra for safety measure to cover any waste from trimming.

A 20×20 garage will measure 20 feet width by 20 feet long and height of wall is an 8 foot high. Total square footage of exterior of 20×20 garage i.e Perimeter × height = 2(20 + 20) × 8 = 640 square footage. Subtract door opening 16×7 = 112 sq ft i.e. 640- 112 = 528 square feet. Formula for number of squares of siding you have needed = (Total square footage of exterior surface ÷ 100 ) + 10% extra as waste for trimming.

To figure the number of squares of siding do you need for a 20×20 shed, divide the total square footage i.e. 528 by 100 to get the number of squares of siding you needed i.e 528/100 = 5.28 squares, add 10% extra i.e 5.28 + 0.528 = 5.8 squares, round it in whole 6 squares. This is the total amount of siding you would need for a 20×20 sq ft garage.

If you want to calculate number of exterior grade plywood sheets, divide total square footage of exterior wall of garage by area of one Plywood sheet. Area of one 4 by 8 sheet of plywood of 1/2″ thickness is 4×8 = 32 sq ft. Divide 528 by 32, i.e 528/ 32 = 16.5 sheets, round in whole 17 sheets.

You will need approximately 8 squares of vinyl siding for a 20×20 garage to cover exterior surface, walls, dormers and triangular shaped Gable. If you used other material to cover the walls, use 17 sheets of exterior grade plywood that measure 1/2 inch x 4 x 8. External covering requires 528 square feet of siding after subtracting the area of opening.

**How much does it cost to siding a 20×20 garage**

The typical installation cost for vinyl siding ranges between $2.5 to $10.75 per square foot, so, it would cost to install to siding for a 20×20 garage is range between $2.5× 528 = $1,320 or $10.75× 528 = $5,676. So, siding cost for a 20×20 garage will range between $1,320- $5,676.

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**Conclusion:**

You would need approximately 8 squares of Vinyl siding for a 20×20 garage. If you use Plywood, 17 sheets of exterior grade plywood that measure 1/2 inch x 4 x 8 will be required to cover wall.