Although size of your roof is important you should also consider the pitch of your roof.
Box gutter pitch.
A steeper pitch will make water run down faster and require an oversized gutter.
Provision is made in the design of the gutter to have a rain flow to the outlet with a maximum slope of 1 200 and a minimum of 1 400.
Design of roof drainage systems.
Box gutters are beautifully designed to fit both the commercial and residential industry.
If you don t have a garden hose you can test the pitch using a bucket of water.
If your gutters don t slope then you only need to adjust the hangers and lower them slightly where necessary to achieve the correct slope.
The amount of collected water increases until it spills over the sides of the gutter.
Mm mm level to 3 76 305 1 00 4 to 5 102 127 305 1 05 6 to 8 152 203 305 1 10 9 to 11 229 279 305 1 20.
The gutter slope otherwise known as the pitch is the amount the gutters slant downward to direct the path of water flow.
Box gutters are essentially placed between parallel surfaces as in a valley between parallel roofs or at the junction of a roof and a parapet wall.
If the slope is slanted too sharply the gutters can t function at full capacity.
A good guideline is that the pitch should cause a decrease somewhere between 1 to 2 inches over a 40 foot run.
These gutters can be made to accommodate regulark style hangers.
Because these gutters are not formed from a coil trough a machine they run in 10 lengths.
Box gutter with rain water head at end of box gutter.
The gutter outlet capacity should suit the downspout capacity.
If gutters slope too severely they don t hold water and water could splash over the sides in heavy rain.
They should not be confused with so called valley gutters or valley flashings which occur at the non parallel intersection of roof surfaces typically at right angled internal corners of pitched roofs.
You can make your own from a box miter and box miters are available in every color gutters are made.
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.
Every box gutter is made custom to order with a standard or custom profile.
If gutters don t slope water gathers in them.
If the gutter slope isn t properly positioned it will pool in the system and spill over the sides.
When you buy your new gutter section make sure you order either an inside or outside box miter at the same time.
Measure from the roof edge at both ends of the gutter if you want to be sure.
The downspout size must suit the bottom width of the gutter.
Section from the box miter with a tin snips and you ve got yourself a custom slip joint.
Test the pitch of your reinstalled gutter by turning on a garden hose and directing the water into the farthest part of the gutter from the downspout.
