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.
There are a few brands of shingles that put the tar strip on the underside. As Joseph said, it bonds the tabs to each other so the wind can't pick them up. One hot day will seal them.
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 the paper.
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.
"Robert11" wrote
Bob,
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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