I notice that water pools up over a mostly filled in downspout fairly often on my built up roof. The downspout goes maybe 3-4 inches deep before I hit a rough and very hard rubbery surface (I can't tell exactly what material it is).

I'm worried this semi-constant pool of water will reduce the lifespan of the roof.

My neighbor suggested filling it in with gravel. Will that work? Or should I fill it in with something else?


  • Would you add a close-up (and better-lit) photo, along with an explanation of what we're looking at? And, you should probably take our tour so you'll know how best to participate here. – Daniel Griscom Oct 21 '19 at 12:41
  • 1
    So it's a removed downspout and you want to fill in the hole? Never a good idea to remove a downspout. If it's partially blocked, you should unblock it completely. – JACK Oct 21 '19 at 12:51
  • 1
    I agree with jack, if you fill the hole with rock you just made the problem worse. Get a drain auger or a water jet and start clearing the pipe. – Ed Beal Oct 21 '19 at 13:18
  • @JACK the house was extended a few decades ago and I guess this was where the previous exterior wall used to be - I tried unblocking it a few months ago and whatever it is a few inches in is very solid - tar-ish now that I think of it. So I'm guessing it can't be unblocked. – khoomeister Oct 21 '19 at 19:41
  • @DanielGriscom thx you're right - will find a day to clear it good and post a better shot. – khoomeister Oct 21 '19 at 19:42

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Browse other questions tagged or ask your own question.