The pitch and tilt of your gutters make all of the difference.
Gutter to roof line.
If the run is long you may need flashing to cover the exposed part of the facia.
For example if you have 30 feet of guttering the calculation is 1 4 x 3 0 75 i e.
If the eave overhang is 12 inches deep multiply the roof line measurement determined in step 1 by 4.
2 your gutters aren t positioned correctly.
Below the shingles on the high side of the gutter run.
Attach the gutter strip to the fascia or roof edge with nails and gutter straps.
Water will blow in there and rot the timber facia.
Slope the gutter down form there towards the spout.
This is incorrect because rainwater pulls back up on the underside of the roof and it drips down under the roof.
Gutters should be hung where a straight edge laying on your roof shingles can easily extend over the front lip of the gutter this is the proper installment location for the high point of the gutter.
In almost every instance gutter installers take the path of least resistance and shove the gutter right underneath the roof shingles instead.
If the eave is between 12 and 24 inches deep multiply the roof line measurement by 5 3.
For pricing and availability.
As a general rule gutter slope is set at 1 4 inch per 10 feet of guttering.
When installing gutters set the proper slope by driving a nail 1 2 in.
Measure the depth of the eave overhang from the edge of the roof not the gutter straight back to the outside wall.
Gutter placement people usually think that gutters should be placed right on the roofline.
For every 10 feet of gutter from this measurement and mark this distance at the low end of the gutter run.
Start at the highest point with the back of the gutter as high as it will go up against the bottom of the slate or tile or galvanised iron roof.
But houses with big steep roofs or those located in climates prone to heavy downpours may need wider gutters and extra downspouts to keep rainwater from overflowing.
In turn rainwater will run behind gutters that hang too high deteriorating the fascia boards along the way.
The pitch of gutter heading towards a downspout can also cause overflow if it s too steep.
Amerimax contemporary 4 in x 5 875 in white half round gutter end with drop.
This means the downspout end of the gutter should be set 3 4 of an inch lower than the other end.
Amerimax 5 5 in x 10 in brown k style gutter end with drop.
Mount the gutter so that the edge without the downspout is slightly higher than the end with the sleeve.
Measure and record the distance from the bottom of the fascia board to this nail.
Measure the length of your roof line.
