How Much Fall Should Guttering Have

I also had a problem that my new flat roofed loft conversion dumps so much water into the valley on the front roof slope that it formed a fast flowing stream that jumped over the gutter.

How much fall should guttering have.

A correct gutter slope prevents standing water caused by rainfall from accumulating on your roof gutters. If the length of the gutter is 10 5 metres 35 feet the amount of slope required is 1 25 cm 1 4 inch multiplied by 1 metres 3 5 feet which when rounded up is 2 5 cm 1 inch. As long as there is a fall and water does not stay in the gutter then all should be fine. Blocked guttering can cause damp problems so if you experience significant leaf fall then consider fitting a leaf protection system.

Before you jump into a diy gutter installation consider hiring a professional to hang your new gutters properly the folks at harry helmet have over 30 years of experience in this area and they ll install high quality seamless gutters that are affordably priced and come with a 20 year warranty. Flexibility a long gutter run say 40 feet can have a downspout at each end. For example if you have 30 feet of guttering the calculation is 1 4 x 3 0 75 i e. For the best results i use 12th sep 2007 01 06 am 3.

If the drop is greater the water could pick up so much speed that it sloshes over the downspout end of the run. Roof gutters need to be pitched toward the downpipes for the water to flow properly. To ensure rainwater runs freely you should allow a fall of 1 350 about 3mm per metre towards the outlet. The minimal slope needed for proper gutter drainage is 1 25 cm 1 4 inch for every 3 metres 10 feet of gutter.

So if you have a 25 foot section of guttering you should set the downspout end of the gutter 5 8 of an inch lower 1 4 x 2 5 5 8 than the other end. This brings up another important rule to keep in mind. Correct fall in guttering. With the steeper fall i now have the water departs the gutters much more rapidly effectively increasing the capacity.

With the easy fall guttering system however correcting the slope of the gutter is a breeze. Old goat join date oct 2006 location tallahassee fl usa age 78 posts 316. Roofing and guttering experts recommend that gutters have at least a quarter inch of slope per 10 feet to avoid standing water on your roof gutters. As a general rule gutter slope is set at 1 4 inch per 10 feet of guttering.

All guttering must slope toward the nearest downspout. Calculate the gutter slope by dividing the length of the gutter needed by 10.