Roof covering to valley flashing

This roof covering is not sealed very well at the valley flashing. It appears as the shingles run perpendicular with the valley flashing all the way up to the ridge and then the horizontal install of the shingles overlaps. The sealant strips are not working well and I think this is not a typical installation. The shingle to valley flashing is not sealed with asphalt cement/tar. I have seen horizontal shingles installed with ‘cutting the points’ but I havent seen this type of install.

I am seeking advice regarding this install and how to write it up. Thank you.





No issues with this install?

Mark, the pictures are very dark and hard to see for me but look at this link. The Long Island valley may be what you are used to seeing except for the “W” flashing which is quality IMO.

Thanks probably to the internet, :stuck_out_tongue: we are seeing a lot of those No-cut, no tar, I call them “California Dreamin” valleys. They perform OK as long as the pitch is steep and the shingles are new, fiberglass and stiff enough to stay down, IMO. Does it leak? is the client’s question.

Is the valley flashing sitting on TOP of the shingles there…?

I have seen many no cut valleys like this in looks but not installation. The perpindicular shingle as you mention CAN be a simple way for the roofer to conceal his pattern @ the valley. It goes without mention that this is in conjunction with properly installed flashing and paper. If for some reason the flashing is sitting on top, WHY? Was this really a valley with no flashing and the ran the shingles beyond the valley on the opposing side and kept their nails out of the valley … hard to tell.


Looking at this a little more, I have not seen valley flashing this narrow before. I’m fairly certain there is something missing here that I can’t see.

I don’t think I’ve installed valley flashing like this with anything less than close to a foot on either side of valley. Seems like if I remember right it’s hard to even find valley flashing under 18".

CMI (construction metals) should have a site for you to look up.


The valley flashing is under the shingles.

I am a contractor as well as a HI. I have installed many roofs in this fashion and have never had a problem with any leaking what so ever.

Thank you, would you recommend they be sealed up the valley with asphalt cement/tar?

not sure how old this roof is but this system seems to work pretty well…if there are no leaks i would make no reccomendations for change as i see nothing wrong here…jmo…jim

Tar generally is not needed. Winds do not enter the valley area very often and the shingles should stay in place.

I have seen lots of this type of valley installation with no problems. I wouldn’t be worried about no tar at the edge unless it is a low sloping roof.