During two REALLY bad ice storms here in Iowa, a huge ice dam formed in one of the valleys of my roof. Here is a picture of my house… The ice dam formed in the valley where the garage roof meets the siding of the second floor:
I have had roofers out and they all say there is nothing “wrong” with my roof but there are steps they can take to prevent something like this happening again (although nobody will give me any guarantees). I should also mention they all told me that usually the root cause of ice dams tends to be insufficient attic insulation/venting, but in this case, the storm created a giant block of ice within a couple hours, then it started raining, so the source of the water was the sky and not melted snow.
The best estimate I got was for $450. They plan on doing the following:
-Take off original shingles all along the valley.
-Put Winterguard all down the valley. He said the stuff is 3 feet
-I remember him mentioning something about step flashing. I think he
wants to add some down the slope of the roof where the roof meets the
- He mentioned using some sort of roofer’s tape to tape off the top of
the flashing so ice can’t get in back of it.
- I think he said something about adding a special piece of siding
- Match the shingles and replace.
He didn’t say anything about replacing any of the decking, just making
what is up there water tight.
He also plans on doing it soon, and the temps are below 40 (should I be concerned with that)?
Does this sound reasonable, or are they just trying to take advantage of someone who is desparately looking for a solution? Will doing this help at all?