Barndominium/Shop or "real" House?

[ETD66SS]

You should go ahead and send the specs and your proposal to NASA. I think they're just now finalizing design for the Moon station laundry room.

It sounds like they need to spend more time designing a better space toilet...

 

[ETD66SS]

My insulation guy says I'm nuts. In his 40 years he's never done R30 walls.

 

[LouNY]

My insulation guy says I'm nuts. In his 40 years he's never done R30 walls.

View attachment 5563728

Looks good, I have to wonder if 3-4 inches of spray foam wouldn't have a better effective insulation value.

 

[ETD66SS]

Looks good, I have to wonder if 3-4 inches of spray foam wouldn't have a better effective insulation value.

Many of the contractors I have talked to gave spray foam a thumbs down, especially in a metal sided/roofed building.

Condensation between the metal/osb and the foam was the biggest complaint. Next was sound transmission through the foam. I guess it's nowhere near as quiet as fiberglass or rockwool.

 

[LouNY]

Many of the contractors I have talked to gave spray foam a thumbs down, especially in a metal sided/roofed building.

Condensation between the metal/osb and the foam was the biggest complaint. Next was sound transmission through the foam. I guess it's nowhere near as quiet as fiberglass or rockwool.

The closed cell does transmit sound, I have it in my ceiling and even on the asphalt shingle roof with an air gap between the foam and interior sheathing then the tongue and groove pine rain fall can be heard.
But the lack of heat/cold transfer is great, I only have 3" but when it snows the 2x6 roof rafter lines show much longer then the foamed area.

 

[ETD66SS]

I have a family member helping me with the insulation, he's been in the business for decades.

I did inquire about spray foam but it would have run at least 3X the cost of the way we're doing it now.

I also looked into rockwool, but again cost was an issue.

 

[WinterDeere]

Many of the contractors I have talked to gave spray foam a thumbs down, especially in a metal sided/roofed building.

Condensation between the metal/osb and the foam was the biggest complaint. Next was sound transmission through the foam. I guess it's nowhere near as quiet as fiberglass or rockwool.

I gapped my spray foam off the metal roof by installing 1" blue foam board on the purlins, before having the rafter bays filled with spray foam. The backside of the steel is still ventilated from soffit to ridge, above that foam board.

Most spray foam contractors just spray right on the underside of the roof, and claim there's no issue with condensation, as there's no air infiltration from which moisture can possibly condense. That's actually solid logic.

The only reason I bothered with the foam board was thoughts of someday having to replace the metal roof, and nightmares over finding replacement with the same exact corrugations to fit the foam that's now been molded to the underside of the old roof.

I can't comment on noise transmission, as I never had this particular building insulated any other way, for a true comparison.

 

[ETD66SS]

I gapped my spray foam off the metal roof by installing 1" blue foam board on the purlins, before having the rafter bays filled with spray foam. The backside of the steel is still ventilated from soffit to ridge, above that foam board.

Most spray foam contractors just spray right on the underside of the roof, and claim there's no issue with condensation, as there's no air infiltration from which moisture can possibly condense. That's actually solid logic.

The only reason I bothered with the foam board was thoughts of someday having to replace the metal roof, and nightmares over finding replacement with the same exact corrugations to fit the foam that's now been molded to the underside of the old roof.

I can't comment on noise transmission, as I never had this particular building insulated any other way, for a true comparison.

Cougar Shield is what the builders used on my metal roof. I was told it was better than the roof steel with the felt layer on the backside for condensation control.

 

[EscapedSuburbia]

My builder used regular house wrap as a shield between the exterior metal and spray foam.

 

[WinterDeere]

My builder used regular house wrap as a shield between the exterior metal and spray foam.

Wouldn't that have to be applied before the roof? I was working under a 20 year old roof in a 240 year old building, built from parts reclaimed from some even-older building. I was just thrilled when I found two actually-parallel rafters, let alone any consistency in spacing, etc.

George Washington wasn't even a General yet, when those rafters were made, for some perspective on the job.

 

[ETD66SS]

Starting on the bubble foil for the radiant heat.

Overhead ladder work is killing me.

 

[civilian]

Why not rolling scaffold? Jon

 

[ETD66SS]

Pretty much ready for the batt insulation in the garage ceiling. Got all the foil up and dryer duct insulation done.

Still waiting for the plumber to do final air tests.

 

[EddieWalker]

Are you going to do everything yourself to finish it?

 

[ETD66SS]

Are you going to do everything yourself to finish it?

I'd like to sub out the drywall, but have not gotten any quotes yet, so will decide that based upon cost.

Probably am not making kitchen cabinets myself.

The rest I'll decide as I move forward.

 

[EddieWalker]

If you hire out the drywall, be sure to take video or pictures of every wall so you can see where your outlets and switches are. Seems like there is always at least one box that gets covered up by the guys hanging it.

 

[Alan46]

If you hire out the drywall, be sure to take video or pictures of every wall so you can see where your outlets and switches are. Seems like there is always at least one box that gets covered up by the guys hanging it.

You got that right bro!

 

[ETD66SS]

If you hire out the drywall, be sure to take video or pictures of every wall so you can see where your outlets and switches are. Seems like there is always at least one box that gets covered up by the guys hanging it.

It seems like they would notice the hump in the wall...

 

[LittleBittyBigJohn]

It seems like they would notice the hump in the wall...

You would think. But it's not super noticeable when they miss one.

I videoed mine beforehand and found at least a couple that were covered. I don't know how long it would have taken me to notice it had I not walked the house following the video.

 

[ETD66SS]

R38 is finally going up in the garage ceiling. No turning back on any of the plumbing & ductwork now...