The original design decision with the open wall has been sending room warmth directly to the vented attic since 1911. The insulation contractor did not notice this, and thus achieved an R value of R0 for this section of attic.
Same crap, just another day (century). There is a cavity over the fiber glass shower enclosure letting cold attic air surround the shower. Nice cold mornings in the new home owner’s future. ( unless repaired)
Good find, @bhull1
Were you able to speak to the builder?
Are they going to fix this for this home, or better yet change practice for others homes in the development?
For the home I posted here’s how much difference it made
Test in: 3083 CFM50
Test out: 2370 CFM50 after 1st day of air sealing, general
Test out: 1763 CFM50 after 2nd day, pocket door
Based on 1500 square feet of floor plan, 4138 square feet for the envelope, and 15624 cubic feet for the volume: About 7 ACH50, .42 CFM per square foot of envelope or 42 CFM per square of envelope.
So it went from 11 air changes per hour to 6.7 air changes per hour.
The standard for new construction sits at 3 air changes per hour at 50 pascals.
A tight home is under 1 ACH50, and a “passively heated” home could reach .5 ACH50.
The condition you found alone could cost the new owner 25%-50% more on HVAC fuel.
Whole house fan from 2 story atrium, into the unconditioned attic.
Basically a big energy hole in the conditioned envelope. The only thing preventing air transfer are some flaps with 1/4" gaps between each one.
On the IR camera, this was a glowing red and white mess (outdoor temperature was 15F, indoor temperature in the mid 60F range because the owners could not afford the fuel to go higher).
I had one in my house for years. Back in 1972 when my home was built, running the air conditioner was not something we did all day everyday. Homes were incredibly inefficient . Running the whole house fan at night with the window next your bed cracked 6 inches would keep you cool all night. And the white noise was glorious. These days, they are generally obsolete.