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Hi, I have an existing roof that is less than 10 years old and I have just added an addition. Part of the shingles needed to be removed but the original tar paper has be left on.

What is the best proper way to tie in the new tar paper with the existing one? Lay it over the existing one? Slip it under?

I attached a picture.

thanks
:)
 

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Use Ice and water shield in the valley. It can stick to the existing felt, although it would be preferable to cut the existing and slip the I&WS under it. Then install the new felt over the other side of the I&WS.

If you elect to use only felt in the valley, cut a separate piece to lay down the valley and install it under the existing and the new. And then make sure you don't tear it stepping on it.
 
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