Tyvek under raw insulation

[Shocker]

Ok, so I am getting ready to insulate the ceiling of the shop. I would like to keep the beams of the trusses exposed. I also have a large amount of Tyvek left over from the build.

So, my idea was to lay the Tyvek out over the base of the trusses and lay non-kraft faced R30 over the top of that.

Does anyone see any issues with that plan? I think I could save some $$$ by doing it this way.

Any thoughts?

 

[tcianci]

The Tyvek is exceptionally tear resistant and will brighten up the shop and it will do a good job of supporting the insulation. The Tyvek is a lousy vabor barrier, look a the published product features... it allows water vapor to pass through. If you use it as proposed, use a kraft faced insulation product.

 

[IP2GSR]

Ok, so I am getting ready to insulate the ceiling of the shop. I would like to keep the beams of the trusses exposed. I also have a large amount of Tyvek left over from the build.

So, my idea was to lay the Tyvek out over the base of the trusses and lay non-kraft faced R30 over the top of that.



Any thoughts?

As stated the tyvek will do a good job of supporting the insulation but it is a moisture barrier not a vapour barrier. Given your climate it's my opinion that you need some type of vapour barrier that is if you intend to heat in the winter. Without the vapour barrier the moisure in the warm air will condense on the insulation as it reaches the cold side. This will reduce the insulation value and eventually may lead to mold problems.

FWIW

Dave

 

[Shocker]

Alrighty then! Kraftfaced it is!