What does a 3/12 pitch mean?
What does a 3/12 pitch mean?
It is the most common way in US and Canada to describe a roof’s basic quality – slope or steepness. Roof pitch is represented in inches rise of 12 inches run. For example a “3 pitch” or “3 in 12 pitch” or “3/12 pitch”, all mean that the roof rises 3 inches, for every 12 inches of it’s horizontal run.
What is the minimum slope for steel roofing?
The minimum slope for lapped, non-soldered seam metal roofs without applied lap sealant shall be three units vertical in 12 units horizontal (25-percent slope). The minimum slope for lapped, non-soldered seam metal roofs with applied lap sealant shall be one-half unit vertical in 12 units horizontal (4-percent slope).
How can I tell the slope of my shingle roof?
Alternatively, there are smart phone apps that can help, but shingle manufacturers distribute convenient pitch estimator cards which provide a quick way to ballpark the slope. A handy roof slope estimator can help you determine if your roof slope is likely too low for shingles.
When to apply asphalt shingles to a sloped roof?
With respect to shingle application, roof slopes from 2:12 to less than 4:12 (18.5°) are called “low slope” roofs, while roof slopes of 4:12 or greater are called ‘’normal’’ or ‘’standard’’ slopes. Asphalt shingles should never be applied to roof slopes below 2:12 (2” of vertical rise for every 12” of horizontal run, or 9.5°).
Which is the best roofing material for a sloped roof?
Asphalt shingles are an effective roof covering material for sloped roofs that can be successfully used on slopes as low as 2:12. With respect to shingle application, roof slopes from 2:12 to less than 4:12 (18.5°) are called “low slope” roofs, while roof slopes of 4:12 or greater are called ‘’normal’’ or ‘’standard’’ slopes.
How does the slope of a roof affect the interior?
A complex low slope roof, with upper decks protected by a self-adhering roof system. Whether steep or low, the slope of a roof has an effect on the interior volume of a building, the drainage, the style, and – most importantly – the material used for covering.
What should be the slope of a roof?
1. Low slope roofs are from 0 to 3 / 12 in pitch. Some sources consider low slope to include 3 / 12 pitch roofs. If asphalt shingles are to be installed on a low slope roof, special steps are required to avoid short roof life and roof leaks.
With respect to shingle application, roof slopes from 2:12 to less than 4:12 (18.5°) are called “low slope” roofs, while roof slopes of 4:12 or greater are called ‘’normal’’ or ‘’standard’’ slopes. Asphalt shingles should never be applied to roof slopes below 2:12 (2” of vertical rise for every 12” of horizontal run, or 9.5°).
What’s the minimum pitch for a shingle roof?
The minimum requirement is 2/12. The 2/12 number is rise over run or two units of vertical for every 12 units horizontal. That works out to about nine degrees if that works better for you.
How can I find out how many shingles I need for my roof?
To estimate how many shingles you’ll need, you need to know the total square footage of your roof’s surface. Find this number by measuring the length and width of each plane on the roof (including dormers) then multiplying length times width.