Minimum Gutter Fall Uk

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.

Minimum gutter fall uk.

If your outlet is situated in the middle of the fascia repeat this process at both ends. If gutters slope too severely they don t hold water and water could splash over the sides in heavy rain. The minimal slope needed for proper gutter drainage is 1 25 cm 1 4 inch for every 3 metres 10 feet of gutter. Box gutter outlets must discharge through either a rainhead or sump.

The difference in position between the two is known as the gutter fall. The numbers on the left hand side of the table show the flow rates when the gutter is fixed level no fall and the figures on the right detail the flow rate when the gutter is fixed to a fall of 1 in 350. The gutter flow rate chart below compares the specific flow rates for each floplast gutter system. This applies to general roof areas along with any internal gutters.

Your gutters have a high point and a low point. Have a minimum depth of 75mm at the high end. Have a minimum width of 300mm for commercial installations 200mm for domestic installations. The gutter slope also called the pitch is the amount the gutter tilts down to let rainwater flow out of it.

Overflow box gutters must have independent overflow provision discharging to the atmosphere. Position and fix a fascia bracket at this point ensuring that it is higher than the outlet and the fall to the outlet is about 3mm per metre. If gutters don t slope water gathers in them. The high point is where the highest gutter bracket is placed and is the furthest from the outlet s.

The amount of collected water increases until it spills over the sides of the gutter. Calculate the gutter slope by dividing the length of the gutter needed by 10. All gutters and downpipes should be accessible for maintenance. According to bs 6229 bs 8217 flat roofs should be designed with minimum falls of 1 40 to ensure a finished fall of 1 80 can be achieved allowing for any inaccuracies in the construction.

If the run has two downpipes then the high point should be placed between them. Measure from the outlet to around 100mm from the opposite end of the fascia. Comparing floplast gutter flow rates.