A sheet of plywood has 32 square feet. So **4 1/2** sheets of plywood would be needed. Round up to at least six sheets of plywood for leeway. Allow for both floor and ceiling joists, often made out of 2-by-6 lumber, spaced either 16 inches or 2 feet apart.

How much plywood needed Calculator?

Once you have the area you can divide by the area of a sheet of plywood to find the number of sheets needed. A ** 4×8 ** sheet of plywood is 32 ft 2. So, dividing the area of the roof by 32 will give you the number of sheets needed. For example, if your roof is 1,500 ft 2 then it will take 47 sheets of plywood to sheath it.

How many plywood sheet do I need?

Divide by the total square footage by the square footage of a sheet of plywood to find the number of sheets required to cover the space. A ** 4×8 ** sheet of plywood is 32 ft2. For example, if the area to be covered in plywood is 800 ft2 then 25 sheets of plywood will be needed to cover it.

Which plywood should I use?

BWP grade plywood stands for ** Boiling Water Proof ** plywood, which is known to be completely water resistant. MR grade plywood stands for moisture resistant grade.

One article claimed that divide the total roof area by 32 to get the number of sheets you will need to cover the roof. ** A typical 4 foot by 8 foot sheet of plywood covers 32 square feet. ** If your roof area is 1,600 square feet, 1,600 divided by 32 will mean you need about 50 sheets to cover the roof. Add 10 percent to allow for.

The amount of weight on the roof is greatly affected by the number of shingle layers installed. In areas experiencing heavy ice and snow loads, ** thick ** plywood is required, unlike in areas where such factors are non-existent.

## How much underlayment do I need to buy?

Underlayment usually comes in rolls of 4 squares each. So, covering 240 squares would require ** 60 ** rolls of underlayment. No underlayment is needed if you are applying shingles directly over an existing asphalt roof. Be sure to add 10% to all of your material totals for trim allowance.

Using these four inputs, you will get several basic outputs: Roof area (measured in ** sq ft ** )Number of squares. Number of bundlesApproximate price (in dollars).

## What is the best material for roof sheathing?

Roofing contractors use this kind of sheathing when there is a need for ** high levels of strong support ** for a roof. Oriented Strand Board Decks (OSB) Oriented strand board decks have quickly become a preferred option for modern roof sheathing. The bottom line, or plywood are a few more things to keep in mind.