Only nail at the edges with only enough nails to.
How to re roof a valley.
Then starting at the base of the.
Remove 8 inches of shingles at each side of the valley with a 16 inch nail bar.
Move to the highest end of the valley and work your way down cleaning shingles from both sides of the valley whether they re damaged or not.
Start at the upper row of shingles at the upper end of the valley.
If the ice and water shield is missing then you will have to remove the shingles on both sides along the valley put ice and water shield in place and re shingle the roof.
Clear any debris in the roof valley and surrounding area.
Take measurements of your roof flashing most flashing is 14 inches wide but yours may vary.
Ensure ice and water protector has been installed along the valley first.