Roof Valley Definition

Valleys are typically found where gable dormer roofs meet the main roof or when a house has angled wings or additions where two roof sections in different planes meet.

Roof valley definition.

Definition of a roof valley the greatest portion of a roof is a flat expanse that is covered with a non permeable material such as asphalt shingles metal tiles or slate tiles to protect the roof structure and the interior of the building. For an open valley a sheet of metal usually steel sometimes copper is fastened to the roof deck. Roof valley synonyms roof valley pronunciation roof valley translation english dictionary definition of roof valley. These leaks can be caused by poor roofing practices or just simply by the age of the shingles on the roof.

The valley area of a roof the straight lines formed when two different planes of the roof meet is a critical area that handles a tremendous amount of water run off. Typically where a valley is located on a roof roof valley replacements are fairly common especially on tiled roofs. An elongated lowland between ranges of mountains hills or other uplands often having a river or stream running along the bottom. A roofer must be careful where the nails are placed in the shingles of valley roofs.

If the nails are placed in the very center of the valley leakage will occur. Roofing shingles are installed then cut and sealed where they overlap the metal channel. This is because the old valleys used to be galvanised and they start corroding with time especially if they trap leaves.