And you ve measured the pitch and tilt and everything looks well balanced o k now ask yourself.
Slow water down on roof.
The force of the plunger may clear the obstruction in the main stack.
It will just roll off the side allowing the roof to dry faster.
I do suggest hanging gutters as high as possible so that water does not over shoot them.
A 1 000 square foot roof can produce more than 600 gallons 2 271 2 l of runoff for every 1 of rain that falls on it.
Dab roofing cement on the nail heads under each shingle tab and in any gaps between the shingles to keep water from getting underneath the diverter.
These roofs also shed snow more effectively.
Let s say you ve inspected the roof and found no debris.
Turn off the water look for drains or toilets that are backing up and plunge them.
You can also slow water to a standstill by catching it and storing it for use.
Since this area of the roof acts more like a river due to the convergence of two roof surfaces the water flows down the valley at a high rate of speed.
Fill it with gravel to slow the runoff and allow the water to seep into the soil.
Press the shingles down to seal them back in place.
If not use a sewer auger to clear it.
This has been a classic problem for most gutter guard manufacturers.
Sometimes the gutters you ve installed are simply too small.
Installing a rainwater tank to catch runoff from the roof o your property and other buildings you may have on the plot gives you access to a regular supply of water that is not dependent upon the mains system.
That means less chance that mold and mildew will grow and a longer lifespan for your roof.
They can t handle the amount of rainwater flowing down the roof.
Run a section of downspout across your roof and dump it into the existing gutter angled in the direction of flow so that the water doesn t splash into the gutter at a 90 degree angle but joins water already headed for the downspout.
When installing a metal roof that has considerable formed thickness to is such as a shake or tile profile using 6 gutters would work better than 5 again to keep water from overshooting them.