Standard Roof Gutter Sizes

Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage.

Standard roof gutter sizes.

Outlet sizing and spacing your gutter system will perform its best when a proper outlet size is chosen to drain a given roof area. Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage. 5 inch 5 520 square feet. You can measure pitch with a 2 foot level and a tape measure.

Then use the chart below to see what size gutter you need. Downspout sizes must not exceed the bottom width of the gutter. Box gutter with rain water head at end of box gutter. If a roof s various drainage areas call for different size gutters go for the biggest one k style.

Welcome to gutter supply your online reference for gutters gutter machines gutter guards and accessories. 5 inch 5 520 square feet. The steeper a roof s pitch the more windblown rain it can collect. Simplified suitable for flattish roofs with little or no vertical faces or steep roofs draining to one side of box gutter only or any roof if you are in a hurry and make the necessary allowances for all catchments.

Come visit our selection of quality products. Then use the information below to see what size gutter you need. They can be 4 5 or 6 inches. Hold one end of the level against the roof level it and then measure the distance between the roof and the underside of the level at its midpoint which.

If a roof s various drainage areas call for different size gutters go for the biggest one k style. Downspout sizes must not exceed the bottom width of the gutter. Calculations are based on level gutter capacity as experimentally determined by the national institute of standards and technology nist. If you are worried you will need a larger gutter than the standard 6 inch it s important to talk to your roofer about your maximum rainfall intensity the pitch of your roof and the drainage area square footage.

When you are completing a gutter replacement the first point to note is that gutters come in different sizes. Furthermore the standard norm for gutters among many in the rain carrying industry is to allow 1 square inch of outlet opening in the gutter for every. The downspout and gutter sizing calculator is located on the tools cad and apps page of the smacna website. Downspout sizes are based on table 1 3 dimensions of standard downspouts page 1 4 of the architectural sheet metal manual 7th edition.

Common in half round gutters the 6 inch isn t the largest size gutter available but for most homes it does the job. 6 inch 7 960 square feet.