In past, I was plagued with ice damming on my roof and upon inspecting
the roof this year, discovered it was shot.
So - this year I tore out the old wooden soffiting and put in the
styrofoam sheets to hold back the insulation and replaced the whole
length with vented aluminum soffiting. Originally there was only 4
12"x6" vents along a 40' span, and they were glogged with paint and
covreed with insulation from inside th attic. I also replaced the roof
vents (which were the old convection turbine things) with Maxx vents.
At the same time I added an additional bathroom roof vent and upgraded
all the fans, ducting with insulated ducting and new bathroom roof
vents to eliminate any condensation in the attic.
Then I reshingled my roof after removing the old shingles.
Now - I we have started to get really cold weather (at last) up here in
Canada, and I swear my whole house feels warmer! Especially the
upstairs. I cannot see this being a function of shingles alone.
I would have thought that filling the attic with cold air due to
improved venting should have made it feel colder upstairs - obviously
not! It is too soon to see whether there is any impact on my heating
bills - either up or down. It was too late in the season to assess the
impact when I would need to have the air conditioning running.
Why is this? Does anyone have an explanation/theory?