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
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.
Yes there is a strip of adhesive on the underneath to helps to hold
down the shingles. Look closely at the shingle and you will see it.
You don't do anything since the adhesive is self bonding with the
shingle underneath. Once the shingles are installed the sun warms the
up enough to melt the glue. It is not a real strong glue but it does
hold down the edge of the shingle which the nails cannot do.
Bonds to the shingle only. There is not wood underneath the shingle
anyway only a layer of tar paper. Of course the first coarse bonds to
One sunny day above freezing would do it, really. This strip of
adhesive is nothing for the homeowner or installer to be concerned
with or worried about. Yes, it is there, but it sticks to the other
shingles on it's own and does not affect or inhibit the installation
or repair of the roof in any way.
The time you really notice it is when tearing it off. Then you will
see that the shingles are not only nailed down but they are stuck to
each other as well. This actually is helpful since you can sometimes
tear off large sections of shingles if they are stuck together well.
In respect to the "Normal 3-tab", the adhesive on the underside is there to
hold the cellophane or paper to the shingle. This is placed there so the
tar strip doesn't stick to other shingles when packaged. You will see most
all manufacturers now print on the cellophane/paper "Do Not Remove".
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