Low-Slope Failure Mode?


#1

I have an old two-story home with a single floor addition having a low-slope (> 10 degrees) lap-seam roof. While I wasn’t watching, someone put shingles on it.

Will the roof fail in the same way it would if it had a proper slope?

Most important, will there be visible signs of impending failure before the roof does leak?


#2

“Most important, will there be visible signs of impending failure before the roof does leak?”

Um, no. You’ll know it leaks when it’s leaking.

Sounds like your roof is done wrong and you know it. Fix it right and sleep well or be prepared to suffer the consequences.


#3

hahahaha


#4

Chances are good that roof will fail immediately.


#5

Call your building department. you can not legally shingle a roof under 2 in 12 pitch. Did they get a permit?

RooferJim


#6

actually you can shingle a 2 on 12 pitch,but it has to have full ice&water shield coverage in order for it to work-i doubt the shingles would have as much life as ones put on a 4 on 12 pitch though,but if they were just installed over an existing roll roof,it`s crap,it will not leak immediately,probably in a year though


#7

ive seen shingles work on low slopes and ive seen them not work on low slopes.

wait till it leaks.
if and when, fix it.

gweedo


#8

If their 3 tab it wont last long.