You want to lay the shingles from the bottom to the top of the valley.
How to shingle a roof valley with architectural shingles.
After that correctly positionthe first shingle and properly snap a line of chalk across the roof to mark the top layer of the shingles.
In this video i show you how i do the valleys on a shingle roof.
For closed cut valleys shingles on one roof plane are installed through a valley and extended at least 30 cm into the intersecting plane.
Only nail at the edges with only enough nails to hold it in place.
Nail the shingles with no tabs such as precut pro start shingles and apply asphalt cement from a caulk gun in many dots along the drip edge under the edge then press the tab less shingles down onto the line of asphalt cement dots with adequate spaces between the dots.
Apply the first real course of architectural shingles so that the tabs reach the lower edge of the starter course.
Start by overlapping a starter from both sides of the valley at the bottom.
Roof installation how to shingle a valley hd by roofrepair101 more about roofing at.
Then your first shingle goes on the side you are going to cut.
When you get to the valley cut the shingles along the chalk line.
Cut the last ridge shingle to the length you need but be sure that no part of the roof is exposed.
Many roofers cut the shingles across because they say it s safer.
Weave and cut the valley on the highest side of the roof.
The next one goes on the low side.
Laying shingles over the starter row and working up.
Once you ve reached the ridge bend the shingle over the ridge so that each side is equal and nail it into place with a single nail on each side.
No one of this affirmat.
Apply roofing cement to the underside of each cut shingle in the valley center.
Shingles from the other side are run through the valley center line and cut along a line parallel to and 4 cm from the center line.
Then starting at the base of the valley center your first piece of flashing in the valley.
Mark a chalk on subsequent roof layers upward.
To secure the roof valley flashing nail it down carefully.
Apply a cover of starter architectural shingles.
Ensure ice and water protector has been installed along the valley first.
It is best placing metal flashing or a scrap piece of wood under the shingle you will be cutting as not to cut the shingle underneath.
Do the same with the next shingle continuing this step until you get to the far edge of the ridge.
A continuous bead of asphalt could trap condensation or windblown water under the roofing at some point.