Two types of metal valley flashing joints

Roofing · Valley Flashings · printed page 18 (PDF page 19)

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Book index entries

Joints in Metal Valley Flashing Metal Flashing Joints Valley Flashing On Roofs

Text in the illustration

1
2
valley sections should be less than 10' long
side view (closeup)
most common joint -uses a 12" overlap
1/2"+ gap for expansion
high quality joint but not as common as simple overlap

Generated explanation

The illustration shows metal valley flashing between two adjoining shingled roof slopes and compares two joints used to connect flashing sections. The first joint is a simple lap with a 12-inch overlap, identified as the most common joint. The second uses interlocking folded ends with a gap of at least 1/2 inch for expansion and is identified as a higher-quality but less common joint. Enlarged side views show the geometry of both connections. Both details specify that valley flashing sections should be less than 10 feet long.

Components

metal valley flashing overlap joint interlocking folded flashing joint roof shingles roof valley

Materials

sheet metal roof shingles