In an
earlier post, I briefly described some ventilation duct supports that I needed to fabricate. I had four supports to make, two for the HRV (one for the intake vent and one for the exhaust vent), one for the dryer exhaust vent, and one for the electrical service conduit. Each vent (and the conduit) are supported at the rim board, but because of the thickness of the exterior wall, each needs to be supported again at the exterior face of the wall.
![]() |
| This is what I left off with in that earlier post - a 1/2" plywood panel, 2x2 flanges, 2 layers of 1 1/2" rigid foam insulation and the start of a hole. I used a hole saw to finish off each hole through the rigid foam. |
I Don't Know - The Sheepdogs![]() |
| Here is the HRV intake support secured between the exterior (secondary) studs, opposite a hole of the same size in the rim board. I drove 3" screws through the stud on either side into the 2x2 flange to secure the support. The hole in each support was located so that the vent duct would have a slight downward slope to the exterior - in case of condensation inside the duct, it will drain to the outside. |
![]() |
| Here is the dryer vent duct, now installed through the rim board. |
![]() |
| And here is the HRV intake duct, now with rock wool insulation installed between the support and the rim board. The reason I used rigid foam insulation on the support is because insulating that same space with rock wool would have been too difficult. |
Now that these vents and the conduit are in, insulating of the north wall can resume. Of course, each of these penetrations will have to be air sealed, but that is done at the interior face of the rim board and is a topic for another day.
