DIY Bonus Room Knee Wall Insulation Tips
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- Опубликовано: 13 окт 2024
- Having a hot bonus room with knee walls can seriously affect your comfort. Many bonus rooms and rooms over the garage have knee walls that are under-insulated or not insulated at all and certainly not air sealed. In this video, Michael shows a different way to insulate, air seal, and properly ventilate the roof around that hot bonus room with knee walls.
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Where is the link to the video you mention at 0:53- how to insulate knee walls?
Sean, here is a link to the video you were asking about: ruclips.net/video/pMZ5JeyS6pA/видео.html. We appreciate you watching our videos and hope that you have a good weekend.
Cool Beans ! Would you put reflective behind the foam board ?
No, because it needs room behind it. the foam works best in this instance.
I see info about issues with two vapor barriers.. would it matter in this scenario that you have paper faced batt installation in the 90 degree wall and then the roof rafters are also vapor barrier ? I have this exact scenario with a slope roof that i need to keep ventilation at the roof rafters considering foam board right over top of those roof rafters which will leave an ventilation channel all the way up to ridge vent then also insulation in that 90 degree wall
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If I already have bat insulation on the roof side of the knee wall and in the floor of the knee wall, can I also install it inside the wall of the knee wall? I have a bedroom upstairs and in the winter it's very dry. So we need to use a humidifier but that humidifier is causing moisture going through the knee wall up into the attic. The ventilation is fine but it's causing an issue upstairs
I am not sure about that, I'd recommend a local insulation contractor take a look.
Looking good
Thank you!
Ninjas: not clear whether the baffles are below are above the spray foam? so do you sprayfoam, then baffle, then rigid foam, then edge foam? or is it baffle, sprayfoam, then rigid foam?
Baffle then spray, then foam board. You want the airflow along the roof.
What do you think works better? This rigid foam(1 or 2"?) or the foild sheet Radiantgaurd material? We do not have ridge vents, but we do have a gable fam (3K CFM. We likely can use a intake fan as well) plus a Whole House fan.
Ninjas, why dont you answer questions?
@@RJG772 Well, the polyisocyanurate foam is it can fit is better, as it have a R value, while the radiant foil sheet has a U factor value and is good for radiated heat, not for convection or conducted transfer. So I put 2 layers of the R6 Polyiso in the walls with a space between the sheets, and then sealed each foam sheet in the space between studs with spray foam. This makes it a R12 with just the foam, yet I think the 1.5" space between the 2 sheets adds another additional R value. So with the foil, the radiated heat will be decreased, and with the foam the conducted heat will also be less. And with sealing each air pocket, this also lowers the convection transfer.
@@philindeblanc did you do this with an un vented roof?
On the angled part of the ceiling is there insulation on that? Mine has insulation blocking the passageway at the top of the knee wall and up along the angled part.
We added the insulation.
does that foam in the updraft area of the truss not make the shingles hold heat on a sunny day?
loved it
Thanks so much for watching and commenting!
What if the bonus room is over the garage?
Yvonne - In the garage, spray foam can be installed under the bonus room floor. Its sound-dampening properties make spray foam ideal for this area. In addition to regulating the temperature, spray foam will prevent the garage air from entering the bonus room.
Why can't we see the whole process from beginning to end? If you spray foam to get a base, don't you lose that air gap?
They probably spray foamed over ventilation chutes. Look up something like the Durovent Rafter Vents