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My New Studio Build (perhaps overly detailed)

Contractor just left my place. He told me over the phone that everything looked great and that he was headed back to his office to schedule the inspection with the city. He cautioned that it might not happen tomorrow, but since the forecast shows no rain this week we should be in good shape to leave it un-tarped until the inspector arrives.
 
Ready for inspection!

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Once the inspector signs off on the foundation I'll be free to pack the spaces between the bays with rockwool. That will eliminate the drum head resonance syndrome when walking around inside of the structure. I could probably get away with normal pink fluffy insulation, but rockwool performs better in situations where it can possibly get exposed to a little moisture. I'll need to do that as close to the date my contractor's guys will be installing the subfloor over the steel joists so the chances of the rockwool getting wet are minimized. It's not the end of the world if it gets a little wet, but no water is better than some water in this case.
 
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Here are some action shots my wife took from our uber-fun Saturday of re-leveling the substructure. She's not shown working here because she was taking pictures, but she does get full credit for being out and helping me move 1.5-2 cubic yards of crushed rock.

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Once I spread out the rock inside the bays the level dropped down quite a bit. It's considerably less pile'y now. Also... That's "bucket grunting face" which as it turns out is a close cousin to "bass face."
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Cool shot of the substructure
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These were the concrete blocks they had used to level off the substructure previously. I wasn't content with these things supporting my entire studio. Evidently they do it that way all the time and it works just fine, but I wanted something more substantial.
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These are the bays that will be filled with rockwool once it's passed inspection, and right before they start putting down the tongue and groove sub-floor/decking.
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My back does not miss carrying pairs of buckets filled 7/8 of the way up with crushed rock. Not. At. All.
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What is the spacing between those joists? They look pretty tight.
You may be faced with the nightmare of cutting down each and every batt of the rock wool.
All of the Roxul I have ever seen is about 15" wide, so it fits between stud walls on 16" centers.
Those floor joists look to be more like 12" centers.
 
I was planning on cutting each one. Face to face is about 13" which equates to lots of cuts. Roxul comes in 3" depths, so it also means stacking them to fill the depth.

Initially I was going to fill the whole thing with sand, but it was going to be WAY more expensive, not to mention back breaking (what hasn't been on this project).
 
It's on the books, but effectively on hold waiting for a weather window with a 1.5 week lead time. It's challenging due to the lead time since they only pre-fabricate the structure once they get the go-ahead rather than just doing it whenever and storing the "panels" in a warehouse. Essentially there's no definite date yet, but we're working hard and hoping for cooperative weather to get things on the book.