Record loads of snowfall (and occasional bouts of rain) mean lots of snow and ice on the Tahoe house – enough to build up ice dams all the way around the house and to eventually find water streaming down the walls in the dining room.
It looks like the problem spot is where one of the dormers meets the roof. Melting snow collects above the ice dam below the dormers, getting under the shingles until it gets high enough to stream down where the dormer wall joins the roof. There is some heat tape installed under these dormers to create drainage through the ice dams but it’s not installed quite correctly and I had mistakenly understood that it’s not necessary to run it at night when the temperatures get down to the teens outside. Apparently there’s enough heat getting through the roof to melt the snow even when it’s that cold outside. So I ended up with water streaming down the inside walls (past electrical outlets, to boot):
Not good. I’ve got a crew coming from Mills Roofing later this week to remove the snow and ice buildup. There will be more snow and then more melt and more ice dams though. The heat tape that is there now is only on a portion of the rear of the house and it wasn’t installed properly. It doesn’t hang over the edge of the eaves as it should (to let the water drain off the roof) and a good 8-10 feet of it is wasted strung up on the wall coming from the junction box. I was able to rearrange some of it but the roof here is too steep for me to deal with most of it.
I’ve been in contact with Brian from Summit Ice Melt Systems and will be looking into potentially installing their product to prevent these ice dams from forming at all. However, that still leaves the issue of all this melt water collecting and refreezing on the deck below – and potentially leading to further water intrusion into the house:
There’s also still the outstanding damage to the roof from prior seasons. There are several sections of shingles missing from the roof but I wasn’t able to find anyone that wasn’t already booked up to repair the damage over this past year. I did eventually sign up with Jeff’s Roofing Truckee but he also wasn’t able to get to it before the first snows arrived. He did manage to locate a supply of the Tamko shingles in South Lake Tahoe though. Hopefully, he’ll get to my roof later this year once the snow and cold weather is gone: