Job Examples of Metal Valley Repair
What We Do
There are multiple wats to install valley flashing. We use European metal folding techniques that allow the valley to expand and contract over seasonal temperature changes.
The valley pans are made from 16 oz cold rolled copper which keeps its form resisting the pressure from the slate.
Bad valley flashing is a flat piece of metal that is hammered on the sides to keep it in place. This type of valley will leak because the metal will expand and contract and rip where the nails are placed, the water will find the nail holes and ride them into the attic, and they are often held together by caulk or roof cement where they intersect which dries out and leaks. Our valley’s are installed to counteract these problems.
We install hems on the sides which are sometimes referred to as a slater’s edge. The premise is that it stops water from moving laterally over the valley during heavy rains. We use metal cleats that lock onto these hems keeping the valley in place yet allowing it to slide due to thermal movement. Therefore, there are no penetrations into the valley pans which will leak later on.
Where two valley pans meet together we opt to fold them together instead of soldering if possible because it allows further flexibility and movement. This seam is hammered down at the top and bottom to allow the field and ridge slates to overlap.
Sometimes we have to install a pleated valley because there is a swoop or circular bend in the roof. The pleats allow for slight angle changes which wraps around these curves.