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.
The number of sheets of plywood you will need for your roof depends on the size of your roof. The average sheet of plywood is 4 x 8 foot, with a surface area of 32 square feet. The average residential roof size is 1,700 square feet, which means a complete set of plywood will count about 53 sheets.
In this case, plywood should be a minimum of 3/8 inch thick. However, you may need to consider bolstering the plywood thickness for a roof that has a higher load. A roof that lays practically flat will have a much heavier load than a steeper roof that allows rain, snow, and ice to roll right off.
Your price could vary depending on how much the roofing company charges for labor, but generally you can expect to spend between $70 to $100 for each sheet of plywood. A 4 x 8 sheet of plywood covers about 32 square feet of roof area—and the average roof measures about 3,000 square feet.
What is the minimum thickness of plywood for a roof?
The minimum flat roof plywood thickness is around 3/8 inches. This is like the necessary thickness to have when you want the plywood to hold the structure of the roof sturdily. The most common thickness of plywood sold in stores is around this thick as well. Most buildings, especially the commercial ones, are using ¾ inch plywood roofing.
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.
The most common plywood sizes are 4- x 8-feet sheets and 5- x 5-feet sheets. We also carry pre-cut project panels that are available in different sizes that may vary by store. The most common thickness of plywood is 1/2-inch, but plywood thickness can range from 1/8-inch to 3/4-inches.
How to know which is the best plywood for roofing?
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.
With all that said, if we were to rank the roofing materials from best to worst for coastal living, it would go like this: Metal Roofing, ceramic tile, natural slate Wood ShakesAsphalt Shingles — in a distant last place .
What is the weight of a 4×8 sheet of plywood?
Softwood plywood weight chart. How a lot does a 4×8 sheet of plywood weight? About Sixty one kilos On average, a 4′ x 8′ sheet of 3/4″ softwood plywood weighs about 61 kilos. Read on to be told more about what impacts the weight and to find the weight for different types and thicknesses of plywood.
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.