The amount you leave here really depends on the geography and type of weather.
Installing metal roofing in valleys.
Install synthetic roofing underlayment or felt paper according to manufacturer specifications and then install the first piece of valley flashing.
Installing metal flashing for your roof project is a challenging but essential step to take to ensure that the new roof remains as weatherproof and as strong as possible the following steps will explain how to install metal flashing in roof valleys.
We have some useful tips for you about metal roofing installation.
Fold the top over the roof ridge and cut the bottom along the drip edge metal.
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.