The evolution of a dream shop build. Eventually with pics.

[Gulf of America]

If you can afford it yes. R7 per inch. We spray 2-3 inches then bib the rest. Sometimes ceiling structures are foamed only. mtmuley

I took his original statement as spray foam under the slab - is that what you’re talking about, rather than using foam board? Never heard of that but can’t think of a good reason it wouldn’t work…

 

[44hunter45]

If future plan is VBRO then I think id do a full apt upstairs with lookout deck. Then stack your utility bathroom and shop sink below the apt kitchen/bath.
Make sure your stairs are generously sloped and have landing close to highest ceiling so you can utilize tractor or loader to hoist any big items for apt.
And sheet what you can with OSB, drywall is trash for hanging mounts. The firewall and ceiling between shop and apt will need 1hr fire rating but up yo you if You do 1/4 gwb over the osb if you really need the smooth wall look. Personally, rough side OSB caulked seams and "high hiding" flat white paint works just fine. I'd also recoment white metal ceiling for light enhancement.

Yes, VRBO later.

This part is really conceptual right now, but I'm sitting on a 55'x5" ibeam that will be a rolling chain hoist track. I just have to work out how to suspend it from the trusses without stressing the bottom chords. Seems easy with king posts.

My original concept borrowed a lot from my neighbor's 30x50. He used scissor trusses. I've penciled in 18' of wall to the truss to allow for 24" floor truss. Truss load is more important to me than headroom.

The hoist will run over the center of the loft deck with a removable rail section. I dream someday of actually have to hoist a whole elk out of the truck bed.

Stairs will be straight and 4' wide to accept a lift chair in our dotage.

If you can afford it yes. R7 per inch. We spray 2-3 inches then bib the rest. Sometimes ceiling structures are foamed only. mtmuley

I took his original statement as spray foam under the slab - is that what you’re talking about, rather than using foam board? Never heard of that but can’t think of a good reason it wouldn’t work…

Right now just talking about under slab. I'm liking spray vs 2" panels for better vapor barrier. It's not called for with spray but I would still do 10mil sheet

Roof insulation depends a lot on how much of my war chest goes to walls and slab. Silly to ICF walls and leave the roof as a heat sink though.

 

[mtmuley]

Yes, VRBO later.

This part is really conceptual right now, but I'm sitting on a 55'x5" ibeam that will be a rolling chain hoist track. I just have to work out how to suspend it from the trusses without stressing the bottom chords. Seems easy with king posts.

My original concept borrowed a lot from my neighbor's 30x50. He used scissor trusses. I've penciled in 18' of wall to the truss to allow for 24" floor truss. Truss load is more important to me than headroom.

The hoist will run over the center of the loft deck with a removable rail section. I dream someday of actually have to hoist a whole elk out of the truck bed.

Stairs will be straight and 4' wide to accept a lift chair in our dotage.



Right now just talking about under slab. I'm liking spray vs 2" panels for better vapor barrier. It's not called for with spray but I would still do 10mil sheet

Roof insulation depends a lot on how much of my war chest goes to walls and slab. Silly to ICF walls and leave the roof as a heat sink though.

In all my years I've never seen spray foam under a concrete slab. mtmuley

 

[HiMtnHntr]

“I dream someday of actually have to hoist a whole elk out of the truck bed.”

There is almost no reason to ever do this, accept to say you’ve done it.

Also, I’ve done it and will never do it again.

 

[Carl]

In all my years I've never seen spray foam under a concrete slab. mtmuley

I know of some guys in the Paradise Valley who like to go that route. Apparently they have trouble keeping sheets in place prior to pouring due to wind. Did a friend’s basement and garage that way. Never been involved myself.

 

[Gellar]

I took his original statement as spray foam under the slab - is that what you’re talking about, rather than using foam board? Never heard of that but can’t think of a good reason it wouldn’t work…

No I meant spray foam on the walls and ceiling.

I have 2” foam under my slab.

 

[mtmuley]

I know of some guys in the Paradise Valley who like to go that route. Apparently they have trouble keeping sheets in place prior to pouring due to wind. Did a friend’s basement and garage that way. Never been involved myself.

So polyurethane spray foam under a slab on grade? mtmuley

 

[Gellar]

So polyurethane spray foam under a slab on grade? mtmuley

Wouldn’t you want a frost wall if you are going to do in floor heat?

 

[Nunjagottam]

In all my years I've never seen spray foam under a concrete slab. mtmuley

Ya, I dont think thats a great idea. Spray foam doesnt handle ground contact very well and it cracks with any stress. I did alot of research before we did ours. I settled on a product called EcoFoil that is made for under slabs (they have all kinds of barriers so make sure to get the under slab stuff). Roll that out over your gravel and tape the seams then run ur Rtech foam and tape those seams as well. If you do it right you can use the hash marks on the foam board for rebar layout and tying your pex.
There is also a click together tray system that is supposed to be ur insulation and also serves as the pex holder. I wanted 2' rebar mat to ensure no shifting of the slab which over time could cause pex failure.
The guys spraying under slabs because they can't figure out how to lay sheets and rebar at the same time aren't going to be dealing with the issues of deteriorating foam under their slab 10yr down the road.

 

[mtmuley]

Wouldn’t you want a frost wall if you are going to do in floor heat?

We lay a barrier then foam board. In Montana. mtmuley

 

[Nick87]

We lay a barrier then foam board. In Montana. mtmuley

Under the floor?

 

[mtmuley]

Under the floor?

Yep. mtmuley

 

[Gellar]

We lay a barrier then foam board. In Montana. mtmuley

I think that’s how they did ours to.

 

[44hunter45]

In all my years I've never seen spray foam under a concrete slab. mtmuley

Me neither. I watched a YouTube and it seems interesting. Costs more of course.

 

[44hunter45]

Taking notes....

The foam on gravel video I watched was a four inch basement pour, not a 6" heavy load floor. He claimed zero cracking with fiber in his mix.
I also wonder about the PSI load on it. Seems like it could very if the applicator got his a/b mix wrong.

I certainly know how to do the pink slabs. There goes another $4,000 and happy because the spray would cost more.

 

[44hunter45]

“I dream someday of actually have to hoist a whole elk out of the truck bed.”

There is almost no reason to ever do this, accept to say you’ve done it.

Also, I’ve done it and will never do it again.

There is always that one buddy posting pictures of the John Deere packout method.

 

[Gerald Martin]

I’ll be installing 15mil plastic and 2” foam board in a garage that is being prepped for radiant heat in the morning.

When I built my house and garage I dug a 32” stem wall below grade in the garage and stacked ICF Build Blocks. I did a 48” stem wall for the crawl space under the house. If I were building a shop I would definitely go with a footer and stem walls rather than a mono pour slab.

Don’t forget to not install the pex tubing under the area you plan to use for your walk in cooler. Hard to cool meat with a refrigerator when your floor is warm.

 

[Dan-06]

We lay a barrier then foam board. In Montana. mtmuley

Seems to be the best way.

 

[Carl]

So polyurethane spray foam under a slab on grade? mtmuley

Yep, that’s my understanding.

 

[44hunter45]

I’ll be installing 15mil plastic and 2” foam board in a garage that is being prepped for radiant heat in the morning.

When I built my house and garage I dug a 32” stem wall below grade in the garage and stacked ICF Build Blocks. I did a 48” stem wall for the crawl space under the house. If I were building a shop I would definitely go with a footer and stem walls rather than a mono pour slab.

Don’t forget to not install the pex tubing under the area you plan to use for your walk in cooler. Hard to cool meat with a refrigerator when your floor is warm.

Yes and yes!