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News & Advice

How Many Shingles Do I Need For A 4×8 Roof?

How many shingles do I need for a 4×8 roof?

To calculate the number of shingles needed for a 4×8 roof, you’ll first need to determine the size of each shingle and the square footage of your roof.

  • Shingle Size – Shingles come in various sizes, but a common size for asphalt shingles is 12 inches by 36 inches (1 foot by 3 feet). Check the packaging or product specifications to confirm the size of the shingles you plan to use.
  • Roof Size – A 4×8 roof is 4 feet wide by 8 feet long, which gives a total area of 4 feet x 8 feet = 32 square feet.
  • Shingles Needed – Now, let’s calculate how many shingles are needed to cover the roof.

First, convert the size of each shingle to square feet: Shingle size in square feet = (Shingle width in feet) x (Shingle length in feet) Shingle size in square feet = 1 foot x 3 feet = 3 square feet.

Next, divide the total roof area by the size of each shingle: Number of shingles needed = (Total roof area in square feet) / (Shingle size in square feet) Number of shingles needed = 32 square feet / 3 square feet ≈ 10.67 shingles.

Since you cannot use a fraction of a shingle, you’ll need to round up to the nearest whole number. Therefore, you would need approximately 11 shingles to cover a 4×8 roof with 12 inches by 36 inches shingles.

Remember that this calculation assumes a simple rectangular roof without accounting for any waste, overlaps, or adjustments needed for roof features like vents or dormers. It’s always a good idea to purchase a few extra shingles for potential waste or future repairs. Additionally, adjust the calculation accordingly if your shingle size differs from the assumed size.


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