Robert11 wrote:
Hello:

Concerning roof shingles.

I understand that there is some kind of "adhesive," or perhaps just
plain tar, on the undersides
of the normal 3-Tab style.

The nailing in of these provides the major adherence to the wood
underlayment of course, but how important is the
adhesive bonding ? How does it actually function ?

Is this bonding to the wood, or is it to the underneath shingle
(only) ?
How many weeks, generally, of hot weather does it takes this bonding
to be effective ?

Thanks,
Bob

I believe what you are thinking of is on the top of the shingle on the
area where the lower tab will cover it and is in the area where you would
normally nail the shingle. The tab of the next shingle will cover that part
and when the sun gets it good an warm it will seal the tab to the upper part
of the shingle below. It will not seal to the wood below the shingles. For
that you need to provide your own adhesive.


--
Joseph Meehan

Dia 's Muire duit