I just did a house today where the last contractor built a small 8 by 14 addition the existing roof was an 8 pitch and it came down to the aditiion which was like a 3 or 4 im guessing there was a valley also going down in the adition's roof. and heres the begining of the hack job. The valley was filled with cement which came down to the 4 pitch addition and they made like a little canal so the water would continue down. the homeowner was up there with me for the first look, so i asked him and he said 1 it was leaking and they had to use concrete to hold the plywood down because i kept lifting up. and i noticed the roof was super springy and after tearing up the shingles i noticed they laid 2 by 4 raftera 2 ft on center. i wish i brought my camera. ive seen framing like that a bunch but i never seen cement on a residential roof.