Rusty Roof Valleys

With a clean valley you can lay down some peel and stick roofing membrane.

Rusty roof valleys.

In modern metal roofing applications the trend tends to be using a weathering steel on a standing seam roofing panel. Rusty flashing is more than just an eyesore. To clean and refinish a roof valley. Use a broom to sweep off the leaves and other debris.

Lay one and two tab shingles as you near the valley so full size shingles will run across the valley. The copper roof valley shown above cracked and leaked from thermal movement. Even badly rusted flashing can be renewed if it s caught early enough. First clean the debris out of the valley including sawdust nails and whatever else is in there.

You can see that repairs were attempted using a black asphalt based flashing cement. 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. However roofing felt s waterproofing ability is ruined the moment the asphalt shingles cedar slate tile etc. Felt tar paper some roofers offer nothing more than roofing felt as a valley liner.

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. Unfortunately not only did the flashing cement give only short term relief its chemistry attached the copper below thinning and corroding the copper. Lifespan of roof valleys is relatively long. The flashing in the valleys of your roof depends on a smooth surface for rain to wash debris off your roof.

Stop nailing 6 inches from the center. Roof one side of the valley running the shingles across it. The flashing around vents chimneys and skylights prevents rain from leaking in. In more rustic styled designs we see it used more with corrugated metal panels.

Shingle the other side of the valley the same way. Snap a chalkline 2 to 3 inches past the valley center on the top layer of shingles. The valleys on many older houses comprise layers of roofing paper which can deteriorate over time. The internal angle formed by the intersection of two sloping roof planes to provide water runoff.

Fold the top over the roof ridge and cut the bottom along the drip edge metal. Roof valleys are troughs that discard runoff water where two sections of sloped roof meet. Wet leafs stick to the valley and corrosion leads to formation of rust bubbles. They can last for more than 20 years but external factors can considerably shorten that period.

A popular trend that has been occurring in mountain retreats and ranch style homes a corten roof offers a unique appeal to many homeowners.