What say you?

[Brad Brinke]

Saw this roof today above a "finished" porch. look funny to you?

[Bob Elliott]

Not from the picture .
What do you think is wrong?

[Michael R. Boyett]

Brad, go take a look at this thread. Those could be 'single tabs', 'jets", 'canadian metrics', etc.

[Keith R. Braun]

Are you referring to the streaking? Try this www.z-strip.com

[Brad Brinke]

I was referring to the shingle tabs. They are regular tabs, only 1/2 is exposed.

[Michael Larson]

Other than adding more weight to the roof structure I don't see a problem as long as the have sealed down to the underlying shingle..

[Kenton H. Shepard, CMI]

Reducing the exposure should notcause problems unless, as Mike pointed out, it added too much weight.

...or unless it left too much of the tab extending out past the self-sealing adhesive strip, which might give the wind more purchase on the shingle and reduce its wind resistance.

Manufacturers specify an exposure for each model of shingle, but I haven't run into any mention of potential problems from undersized exposures.