Rusty Roof Valleys

Fold the top over the roof ridge and cut the bottom along the drip edge metal.

Rusty roof valleys.

With a clean valley you can lay down some peel and stick roofing membrane. Shingle the other side of the valley the same way. Lifespan of roof valleys is relatively long. The valleys on many older houses comprise layers of roofing paper which can deteriorate over time.

Roof valleys are troughs that discard runoff water where two sections of sloped roof meet. Roof one side of the valley running the shingles across it. First clean the debris out of the valley including sawdust nails and whatever else is in there. Snap a chalkline 2 to 3 inches past the valley center on the top layer of shingles.

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. Even badly rusted flashing can be renewed if it s caught early enough. Severely rusted flashing may warp curl or even develop holes exposing your home to the possibility of damaging leaks. In more rustic styled designs we see it used more with corrugated metal panels.

Wet leafs stick to the valley and corrosion leads to formation of rust bubbles. This is because the old valleys used to be galvanised and they start corroding with time especially if they trap leaves. Believe it or not one of the most common causes for roof leakage is leafs. However roofing felt s waterproofing ability is ruined the moment the asphalt shingles cedar slate tile etc.

The flashing in the valleys of your roof depends on a smooth surface for rain to wash debris off your roof. You can see that repairs were attempted using a black asphalt based flashing cement. Lay one and two tab shingles as you near the valley so full size shingles will run across the valley. Unfortunately not only did the flashing cement give only short term relief its chemistry attached the copper below thinning and corroding the copper.

The internal angle formed by the intersection of two sloping roof planes to provide water runoff. In modern metal roofing applications the trend tends to be using a weathering steel on a standing seam roofing panel. The flashing around vents chimneys and skylights prevents rain from leaking in. To clean and refinish a roof valley.

The copper roof valley shown above cracked and leaked from thermal movement. They can last for more than 20 years but external factors can considerably shorten that period. Rusty flashing is more than just an eyesore. Stop nailing 6 inches from the center.

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.