When deciding how to shingle a roof valley you will need to consider your materials the climate and the desired look of the roof.
How to do a roof valley on 12 pitch.
At this moment we are stuck on how to bend our valley flashings for a 16 12 pitch roof.
If you re using a roofing calculator press the pitch button to input the pitch ratio in the calculator s memory.
Roof pitch is measured in a rise to run ratio with the vertical rise always shown first.
So if your roof is a 45 degree angle that is for every 12 along the horizontal run it rises 12 it s a 12 12 pitch.
If it rises only 6 for every 12 it s a 6 12 pitch.
You ll have a steeper part of your roof turning into a lower slope so there s a steeper pitch up top and a lower pitch on the bottom.
Using a pitch measuring tool that i d made we also determined that the exact pitch of the shed roof was 3 1 2 in 12.
Divide the rise by the run the run is 12.
The traditional method has been rise inches 12 run inches.
First clean the debris out of the valley including sawdust nails and whatever else is in there.
To keep the porch roof framing as simple as possible we installed a structural ridge supported by posts at each end with the common rafters landing on top of the ridge.
Blind valleys simplify framing.
Iko recommends that you install architectural shingles with the open valley method for the best roof performance.
We need to do something where that change happens so the panels can go down and water can come off hit the lower slope and come off the roof.
The three methods to shingle a roof valley.
We re going to do a pitch transition or change.
This would be handy when we fabricate our valley flashings.
On a related note the pitch properly the slope of a hip or valley rafter will not be the same as the pitch of the adjacent roof sections.
Roof valleys are like gutters with a steep pitch but the stakes are higher for valleys than they are for gutters.
In this video we ll flash the valley.
On the common rafters the plumb cut is marked with a framing square for a 12 in 12 pitch 45 and cut square i e no bevel.
The first cut that i make on both the common rafters and the valley rafter is the plumb cut where the rafter will meet the ridge board.
Also measure the length of half of the roof from one side of the ridge beam to the edge of the building.
I am in the roofing business and for the life of me i cannot figure out how to calculate the compound angle created by one roof meeting another roof.
A roof pitch multiplier also called a roof pitch factor is a number that is multiplied by the area covered by a sloped roof to produce the area of the actual surface of the roof for roof slopes expressed as x in 12 rise in run the roof pitch multiplier is determined by finding the square root of rise run 1.
If the roof rises 7 inches 18 cm for every 1 foot 0 30 m its pitch would be written as 7 12.
This recommendation includes iko s premium shingles.
