Module 8: Strategies for Air Sealing

Question 1

When does thermal bypasses happen?

Answer 1

occur where cold air is transfered through framing and structural elements

Question 2

what is the most effective way to pinpoint problem areas for air leaks??

Answer 2

blower door apparatus

Question 3

what is solar vapour drive?

Answer 3

the moisture is driven to the inside of the wall, and condensation can occur behind a vapour barrier

Question 4

what can you do to overcome solar vapour drive^

Answer 4

1. foam sheathing
2. use light colour cladding
3. use a smart vapour retarder

Question 5

what is an ice hump

Answer 5

ice that forms when the roof over the attic gets warm enough to melt the underside of the layer of snow on the roof

Question 6

how do you eliminate ice damming

Answer 6

better air sealing, higher insulation and proper venting in the attic