Asphalt run on shingle

[Paul Edmonson]

First time to see this on a shingle. Any thoughts on this type of run? Manufacturing defect?

Thanks

Paul

[chris mcintyre]

Looks like a steep roof, shingles are not laying flat.....roof over?

Runs may be from adhesive that the roofer applied.

[Rick Cantrell]

Could be that the roofer applied mastic, but
I think it is more likely that the factory applied too much mastic on the strips. Gonna be one or the other though.

[Scott Patterson]

I'm thinking that that the roof was installed when it was cold and the shingles did not seal. Then the roofer came back and applied mastic/goop and we are seeing the result after the shingle have heated up.

[Paul Edmonson]

Thanks for the feedback. I appreciate it.

Paul

[Jerry Peck]

Many shingle roof manufacturers require, for steep roof installations, that the bottom of the shingles be masticed (is that a word? ;) ) down with plastic roof cement as the shingles are at such an angle that gravity may not seal the shingles together.

Use too much plastic roof cement and get a real hot day ... yeah, I can see that happening ... or even worse with more plastic roof cement dripping down.

[Brandon Whitmore]

Today, I had a house that had horizontal bleed out coming from the architectural comp. shingles at the glued on chunks that give them that 3d look-- they were definitely not due to someone gluing them down after the fact. Dang it-- should have taken pictures.