Customer wants to re-roof with architectural shingles, mainly to update the look since the roof currently has three-tab shingles which are going on roughly 14 years.
Question: Since I’m just going over the existing shingles, would you flash the valleys like you typically would if it were a new installation? Or would you forgo the flashing?
I’m asking because there are a bunch of valleys, so we’re talking a little extra time and materials.
Thanks..
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Replies
If the three-tabs are in good shape, then they will channel any water to the drip edge...
but i'd flash it anyway.
I wouldn't want water having ANY chance pooling.
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would you flash the valleys like you typically would if it were a new installation?
What's that mean exactly?
Are they open or closed valleys?
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There are at least six ways to deal with a valley. Some don't use any flashing. I don't have any idea which you plan to use.
but generally speaking, odds are good that the existing valley metal was intended to last the life of the 20 year shingles on there now, so at most, it has another ten years of life left, but you are overlaying with shingles intended to last 25-50 years.
How embarrassed will you be when the valley starts leaking all worn out well before the shingles are showing their age?
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