How To Size Box Gutters

5 inch 5 520 square feet.

How to size box gutters.

While a smaller commercial building might be able to get away with 5 inch box gutters we generally recommend that you start by looking at the 6 inch sizes. 5 inch 5 520 square feet. Sides must be vertical. Sizes the depth shown of the box gutter is the depth at the upstream end.

Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage. Then use the information below to see what size gutter you need. If a roof s various drainage areas call for different size gutters go for the biggest one k style. For example by going up to a 6 inch from a 5 you are increasing the amount of water the gutters can hold by 40.

Box gutters must be straight no bends. Down pipe must be vertical from sump not to the side minimum sump length is 400mm. If the adjusted square footage is equal to or less than 2 500 feet 760 m choose 5 in 13 cm half round gutters. For square footage up to 3 840 feet 1 170 m use 6 in 15 cm half round gutters.

Gutters come in k style and half round style. Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage. Calculate the necessary scaling factors to scale these dimensions to the flow we want. If a roof s various drainage areas call for different size gutters go for the biggest one k style.

Then use the chart below to see what size gutter you need. Must have a constant slope between 1 40 and 1 200. Choose the size that corresponds with the adjusted square footage.