Open Metal Valley Roofing

Open valley when compared to a closed valley and open valley adds an additional layer of lining.

Open metal valley roofing.

Roofing shingles are installed then cut and sealed where they overlap the metal channel. Metal roofing and flashing details are a bit funny that way. After the underlayment is placed a pre bent metal valley lining is installed. Fold the top over the roof ridge and cut the bottom along the drip edge metal.

I m sure they are there for a good reason. Metal valley does not extend more than 8 outward from the valley whereas shingles can go as far out as you want them to. From a more opinionated viewpoint an open metal lined valley has a cleaner and more appealing look. Ice barrier underlayment installed in roof valley.

In comparison to a closed valley an open valley adds another layer of lining into the valley. All shingles removed from closed cut valley. First clean the debris out of the valley including sawdust nails and whatever else is in there. This metal lining can be made of any type of metal that is resistant to the effects of weather acid rain or other contaminants.

This valley flashing material can be manufactured from any metal that will resist the effects of weather acid rain and other contaminants. If the metal expands and contracts you could get some minor oil canning but nothing that effects the integrity of the valley. With a clean valley you can lay down some peel and stick roofing membrane. The metal is usually pre painted to best complement the shingles color blend.

An open metal lined valley properly installed is functionally better long term. I ve seen heater cables installed over metal valleys. After the self adhering underlayment is installed across the valley a pre bent metal valley lining is installed. For an open valley a sheet of metal usually steel sometimes copper is fastened to the roof deck.

Entire width of new metal flashing properly extends over fascia at bottom of roof. In a closed valley shingles wrap from one side of the valley to another. Roof mastic applied along sides of valley flashing.