What is a woven Valley?


Benjamin Knight   |   Member since 2016  |  10+ Answers Submitted  |  ✔ Verified

A woven valley is one method of installation for asphalt shingles at a valley where two intersecting roof slopes meet (see featured photo above). Woven valleys still require membrane flashing or multiple layers of roofing paper to line the valley under the shingles.

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Liv Wigley   |   Member since 2008  |  10+ Answers Submitted  |  ✔ Verified

Likewise, is Valley flashing necessary?

Closed valleys aren't required to have metal flashing, but they should have additional underlayment lining the valley, preferably a couple layers of roll roofing. You can usually see whether this has been done by looking carefully at the bottom edge of the valley.

Beside above, which side of the valley do you Shingle first? Each end shingle strip should have the upper corner trimmed and set in a bead of roof cement. NRCA recommends shingles first be installed on the valley side with the lowest slope or shortest distance to the ridge. If all conditions are equal, either side may be installed first.


Bob Warren   |   Member since 2020  |  10+ Answers Submitted  |  ✔ Verified

In this way, are metal valleys better?

Metal valleys are better than a woven valley in my opinion (and probably most others). They look better and last longer.


Tara Lynch   |   Member since 2013  |  10+ Answers Submitted  |  ✔ Verified

Can you weave a valley with architectural shingles?

The Three Methods to Shingle a Roof Valley. To achieve a woven valley installation, a roofing professional lays shingles in the valley and weaves them together. So, if you are installing a woven valley, you must push the shingles snugly into the valley, while not nailing within six inches of the valley center.


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Jacob Cadman   |   Member since 2007  |  ✔ Verified

What is a California roof?

When one roof is framed on top of another, already existing roof, this type of roof framing is sometimes called “California” roof framing. I refer to the roof that is framed first as the “existing roof” and the roof that will be framed on top of it as the “California roof”.


Andrea Campbell   |   Member since 2018  |  ✔ Verified

Does flashing go over or under tar paper?

Installing roof drip edge flashing properly The best way is to install the roof drip edge only along the eaves first, then place ice-and-water barrier (in the snowbelt) or felt paper (underlayment) over the drip edge. This lets any water that gets on the roof run down the underlayment and over the drip edge.


Daniel Alldridge   |   Member since 2006  |  ✔ Verified

Where do you nail architectural shingles?

Lay one row of shingles, starting from the lower left corner of the roof. This row should project half an inch (1.27 centimeters) over the eaves. Nail down the shingles as you go along. Lay the next row of shingles, directly on top of the first row, making the row two tiles thick.


Goldie Lynch   |   Member since 2011  |  ✔ Verified

What does step flashing look like?

Step flashing can be made with aluminum, copper, lead, galvanized steel, or stainless steel, but most commonly it is aluminum or copper. Small L-shape flashing pieces must be woven into the shingles as you work your way up the roof. The flashing integrates the roof cladding into the wall cladding to keep water out.


Luke Lucas   |   Member since 2020  |  ✔ Verified

How do you attach shingles to an existing roof?

The easiest way to tie in the new shingles with the old is with a cut valley (see Four Ways to Shingle a Valley). After the addition roof is framed and sheathed, snap a line on the existing roof shingles 2 in. up from the valley center, and cut through the shingles and underlayment.


Josephine Harris   |   Member since 2007  |  ✔ Verified

How do you fix roof valley flashing?

How To Repair a Leaky RoofStep 1: Inspect valley for holes all along joint. Step 2: Clean surface of valley with wire brush. Step 3: Cut sheet metal patch about 2 inches bigger all around than hole. Step 4: Spread thick coating of roof cement on damaged area and press patch into place, bending it to shape of valley.


Dalia Connell   |   Member since 2014  |  ✔ Verified

Does flashing go over or under shingles?

This is true no matter what type of roof-covering material is installed. Flashing should overlap the roof-covering material, but on asphalt shingle roofs, for aesthetic reasons, the part of the headwall flashing that extends down over asphalt shingles is often covered with a course of shingle tabs.


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