The amount you leave here really depends on the geography and type of weather.
Installing metal roofing in valleys.
We have some useful tips for you about metal roofing installation.
With a clean valley you can lay down some peel and stick roofing membrane.
Flashing should be installed in all of the valleys.
If you have any problems with roofing installation or need help with the technical aspects of laying your metal roofing.
Fold the top over the roof ridge and cut the bottom along the drip edge metal.
We re going to install the offset cleat the length of the valley and have it set back 4 inches so that we keep our reveal so that ice snow and water can flow off the panel hit the flat of the valley pan and exit the roof.