How To Measuring Tape Gutter Slope

This means the downspout end of the gutter should be set 3 4 of an inch lower than the other end.

How to measuring tape gutter slope.

As a general rule gutter slope is set at 1 4 inch per 10 feet of guttering. The steeper a roof s pitch the more windblown rain it can collect. Use a tape measure to mark a second spot 10 feet closer to your downspout checking that the line between the two marks is level as you go. There s no hard rule on the angle of the slope.

Measure from the roof edge at both ends of the gutter if you want to be sure. Measure the length of each gutter run. This second mark should be at least half an inch higher than the first one. Otherwise it s a sign that your rain gutter slope isn t sufficient and needs adjustment.

Start on the end of the gutter farthest from the downspout and measure the space from the roof edge to the top of the gutter. As long as there is enough slope the water will naturally run out. A good guideline is that the pitch should cause a decrease somewhere between 1 to 2 inches over a 40 foot run. Masters in the art of constructing contained french drain systems.

It should pitch from the middle toward the downspouts at each end. 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 gives you a 12 inch run. Measure length of twine. Make a mark with chalk and record the measurement.

Mark the measurement on the fascia board. You can move along the roof bringing the twine to the other end of the gutter run. Take the same measurement at the opposite end near the downspout. Carefully climb down the ladder and move it to the chalk mark.

You can measure pitch with a 2 foot level and a tape measure. Add 1 2 inch or 1 inch to this measurement depending on gutter length and mark the fascia. For example if you have 30 feet of guttering the calculation is 1 4 x 3 0 75 i e.