Extensive can mean different things such as 36 membrane weather watch winterguard then 24 alum valley flashing with woven shingle on top with some 15 or 30 felt along the way.
Can you weave laminated shingles.
Laminated shingles are more liable to create bumps in woven valleys.
They have a flat appearance which can be less preferable than dimensional shingles.
Instead of one layer laminated or architectural shingles have two or more layers with three dimensional tabs of varying sizes.
Water has a small chance of even getting up under the woven valley shingles even though it flows in either direction.
Get the roofer to tell you in writing what they did.
A woven valley shingle installation is one where the shingles from both sides of the roof valley extend over the valley and weave together overlapping courses alternately.
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Often they are too thick to be woven at all.
3 tab shingles are less thick than architectural shingles so they need to be replaced sooner.
Pros of woven valley shingle installations.
You seem to think from experience that portions should be redone.
When considering how to shingle a valley with architectural shingles you must take into account their thickness and reduced flexibility.
Woven valleys are not recommended for landmark tl because the tri laminated shingle can buckle and become damaged when shaped into the valley the installation instructions doesn t say not to weave your vallyes but it is definetly frowned upon.
Open metal vallyes are over kill in most cases with standard architectural shingles.
Whichever option you choose there are pros and cons for each type of asphalt shingle.
Thus iko does not recommend installing a woven valley with laminated shingles.
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They are on the decline in popularity.
All of the shingle rows will need to be lined up correctly.
Shingles not only gives you a painful rash it can also lead to other serious problems.