The roof decking went on in what seemed like about an hour. Incredible.
One of the reasons it goes so fast is that framers have lots of tricks. Here are a few.
As soon as the framers got the roof decking on, the roofers came by to do the “dry in.” Normally, this step would comprise laying down “ice shield” (a self-stick membrane) at the eaves of the roof and then “underlayment” (30 lb. asphalt impregnated felt paper or Feltex, a modern polymer equivalent). In our case, we laid down ice shield on the whole roof. It cost about $1000 more in materials, but is another layer of insurance against ice damming. Once the ice shield (or ice shield and underlayment) is put down, the house is dry. It can survive several months of weather with no problems. I’ll be happy to get the real roof on in a week or two, but it’s nice to know that weather is no longer an obstacle to progress on the job.
I’ve now observed a few weeks of snow on the roof. So far no ice dams and very few icicles…just what has resulted from the sun melting snow at the fringes of the exposed roof.
The snow slid off one section of the roof (the northeast corner, strangely). It was pretty dramatic when it went. We had a few quite warm days last week (around 35F/2C) and I think the ventilated roof actually allowed melting at the roof surface when warm air vented up through it. The snow bars above the hot tub are working very well.