Rusty Roof Valleys

Wet leafs stick to the valley and corrosion leads to formation of rust bubbles.

Rusty roof valleys.

Severely rusted flashing may warp curl or even develop holes exposing your home to the possibility of damaging leaks. Snap a chalkline 2 to 3 inches past the valley center on the top layer of shingles. To clean and refinish a roof valley. Felt tar paper some roofers offer nothing more than roofing felt as a valley liner.

With a clean valley you can lay down some peel and stick roofing membrane. Believe it or not one of the most common causes for roof leakage is leafs. Rusty flashing is more than just an eyesore. However roofing felt s waterproofing ability is ruined the moment the asphalt shingles cedar slate tile etc.

Use a broom to sweep off the leaves and other debris. Shingle the other side of the valley the same way. Roof one side of the valley running the shingles across it. This is because the old valleys used to be galvanised and they start corroding with time especially if they trap leaves.

The valleys on many older houses comprise layers of roofing paper which can deteriorate over time. The copper roof valley shown above cracked and leaked from thermal movement. Lifespan of roof valleys is relatively long. A popular trend that has been occurring in mountain retreats and ranch style homes a corten roof offers a unique appeal to many homeowners.

In more rustic styled designs we see it used more with corrugated metal panels. Lay one and two tab shingles as you near the valley so full size shingles will run across the valley. The internal angle formed by the intersection of two sloping roof planes to provide water runoff. You can see that repairs were attempted using a black asphalt based flashing cement.

First clean the debris out of the valley including sawdust nails and whatever else is in there. They can last for more than 20 years but external factors can considerably shorten that period. Fold the top over the roof ridge and cut the bottom along the drip edge metal. A rusty valley on a tile roof which needs to be replaced typically where a valley is located on a roof roof valley replacements are fairly common especially on tiled roofs.

Roof valleys are troughs that discard runoff water where two sections of sloped roof meet. Stop nailing 6 inches from the center. Unfortunately not only did the flashing cement give only short term relief its chemistry attached the copper below thinning and corroding the copper. The flashing in the valleys of your roof depends on a smooth surface for rain to wash debris off your roof.

If not maintained properly roof valleys can become clogged with leaves and other debris which can cause the metal to rust and the roof to leak.