Finishing my basement and have a question about the R20 basement insolation wrap.
The wrap is R20 and goes almost down to the floor.
Can I stud over the wrap and then add more insolation in the studs with no vapor barrier? Or no extra insolation at all?
It would be best to remove the existing insulation and vapour barrier however you can leave the insulation in but definitely remove the 6 mil Vapor Barrier completely then frame your 2 x 4 Walls in front of the insulation and you must insulate the two by four walls either way you do it. The most important thing is not to leave a vapour barrier on the existing insulation. Remember when you frame your walls leave a 1 inch air space from the back side of the wall to the concrete foundation wall. Happy framing. Stay safe and stay happy
One last thing don't forget to install 6 mil Vapor Barrier on the warm side of your new wall once you insulate it completely
Good morning Chris,
Sounds like you have the blanket insulation such as the attached picture?
If the blanket insulation is in good shape, well secured to the basement wall, well sealed vapour barrier then you may wish to leave it in place. If in good shape you don't need to have the extra cost of replacing the existing insulation. It meets existing Ontario Building code of R20 for basements.
You can install a 2x4 framed wall in front of the insulation. Up against it but not pushing, squishing the insulation.
2x4 framed wall and drywall and you would be complete. Ensure your meeting building code when completing your framing.
The building department here in Ottawa has confirmed this is an approved method of completing a basement. We have completed many basements this way.
Always best to check with your local building department.
Remember you need a building permit when finishing a basement. The insulation, framing, HVAC must be inspected.
Cheers
Dave
360renos.ca
As the previous respondent has said what you are proposing can be done however adding additional insulation to the studs is probably not a good idea.
The Code requires that the vapor barrier be on the warm side of the insulation. The idea is to not have moisture condensing within the walls. If you Google 'dewpoint in walls' you can learn more about the subject and the use of the psychrometric chart. If you wanted to try and capture a little more space you could use 2 x 3" studs or 2 x 4" on the flat assuming you have the normal 8' basement.
An advantage of leaving the existing insulation and vapor barrier is the reduction in thermal bridging caused by the framing.
Thanks, great information.
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