Shavingcrete

[Xist]

The Pria Gia is definitely the most interesting current project that comes to mind.

I watched the videos. Only the first one really made sense to me--for the most part. Then YouTube suggested cat videos.

Those were great!

[freebeard]

Isn't there a cat in this video?

https://www.youtube.com/watch?v=qL0BB2PRY7k

made you look.

[Xist]

"I guarantee that you have never seen insulated studs before!"

Actually, someone told me about them here about a year ago. As I recall, they said it was a slice of IPS, but I cannot find it now:

https://www.youtube.com/watch?v=mxDSulcLpAE

[skyking]

those will still transmit some heat and sound. If you are looking for quiet, build walls with 2x6 plates and staggered 2x4 studs, with insulation. The sheeting is uncoupled from the other side completely, except for the top and bottom plates.

[freebeard]

You shouldn't put staggered studs on 16" center, put them on 12" centers and have 24" between studs on the sheeting/siding.

How do those foam sandwich studs compare to metals studs filled completely with foam?

[Xist]

Originally Posted by freebeard

You shouldn't put staggered studs on 16" center, put them on 12" centers and have 24" between studs on the sheeting/siding.

Sounds good.

Originally Posted by freebeard

How do those foam sandwich studs compare to metals studs filled completely with foam?

https://www.buildingenclosureonline....s-wood-framing

4" metal studs are 3.5", but 6" and 8" studs are 6" and 8", respectively. The chart says that insulation rated R25 is effectively R7.8 16" on-center and R9.6 24" on-center.

You have eight inches of insulation, but it is like you only have 2.5"?

Fail!

I have wondered about that. Metal would be a far greater thermal bridge than wood, but vastly thinner, so you would have more insulation.

Steel studs are 25 gauge, which is 7/320th of an inch, while wooden studs are 480/320ths of an inch thick.

Just a bit thicker...

Walls with R25 insulation and wooden studs would effectively be R21.1 16" on-center and R21.5 24" on-center.

"The r-values of wood are specified as 1.25 per inch." The r values of wall systems

A 2x8 is 7.5" thick and would have an R-value of around 9.375, so metal studs and R25 insulation are about as good as 8" of wood.

The 8" Tstuds were rated R20, but according to new standards [that are still being adopted], they are now R19.

Update on the Aircrete shed:

https://www.youtube.com/watch?v=9C5ZnERcEGQ

[freebeard]

Came here to post this but now I want to re-read the whole thread. Not enough hours in today.

https://www.youtube.com/watch?v=cm23l_VLyp4

Matt Risinger. Very complete presentation. I like the pressure-washed porch roof posts.

Note their third example at the end. Strip your existing walls back to the studs and add depth on the outside. Order materials from www.hempitecture.com

[Piotrsko]

Originally Posted by freebeard

Strip your existing walls back to the studs and add depth on the outside.

Problem here in Reno with that: needs to be done with a permit which causes tax assessment increase because they measure the outside perimeter only

[freebeard]

The video shows centered studs. One could add thickness on the inside and lose space there, else accept lower R-value.

YMMV in different juridictions.