What the hell is rockwool?

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tubedude

tubedude

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Any links? IS the stuff loose or in panels like 703?
Any pictures? I'm picturing some weird stone shavings that are really heavy in bulk. Ha.
 
Some people refer to it as mineral wool........I can't remember the exact way it's made but it looks similar to normal fibre glass batts that you put in the ceiling except it has a different consistancy and feel and is quite a bit denser, and it is usually a greyish brown colour.....not bright pink or yellow.

:cool:
 
Rockwool, mineral wool - it's all fibreglass, right? Just a different 'consistency' LOL.

Like fries and mashed - it's all potato. No?
 
Rockwool is manufactured from diabase which is a natural material, a pure volcanic rock millions of years old................that is from a manufacturers website. Basically Rockwool is usually a combination of natural rock and blast furnace residue based fibres.

:cool:
 
So much for my 'it's all fibreglass' idea LOL.

Michael - the pictures in that thread you linked to are spectacular. You got any more recent shots?
 
Michael Jones said:
It comes in 2'x4'x4" pieces.
It's really dense. You can't.... bend it.
Here's a pic of it in place.

https://homerecording.com/bbs/showthread.php?threadid=101990&highlight=wall
Click to expand...



Lots of it you can bend, quite easily.
It comes in different densities. And, from manufacturer to manufacturer, different stiffnesses.

The stuff I get is 4pcf, though it also comes in 6 and 8pcf, both of which have better low-frequency absorbtion.

For 2" thick 4pcf, I've paid anywhere from 37-48 cents Canadian per square foot (depending on market value and quantity ordered), though I've hear of a guy getting some 2" 8pcf for 11 cents Canadian.

For 1" thick 4pcf, figure half the price.

For 4", obviously twice the price.
 
tubedude said:
HOw much do the 4 inch panels cost?
Click to expand...
I'm going to order a bunch this week. I'll let you know for sure what it cost.

Last time I ordered it, I got 18 bags, with three 4'x2'x4" pieces per bag. So that's 24 sq. ft. per bag.
432 sq. ft total.
I think it was about $700?
So that's roughly 62 cents per sq. ft.

I ordered a bunch of 703 at the same time, so, I'm not sure if that was included in the $700.
I'll have to dig up the reciept.
 
dobro said:

Michael - the pictures in that thread you linked to are spectacular. You got any more recent shots?
Click to expand...

Here:
https://homerecording.com/bbs/showthread.php?threadid=104515&highlight=A/C

here:,
https://homerecording.com/bbs/showthread.php?threadid=106926&highlight=A/C

here:,
https://homerecording.com/bbs/showthread.php?threadid=109164

more here:,
https://homerecording.com/bbs/showthread.php?threadid=109253

Hey, you asked!
:D

Basically, I've been doing the 4 or 5 punch list items the framing inspector has asked for.
The biggest ones were fire stops between the rooms, and, get this: I had to build a landing out from the Side door, the one that exists the CR.
It was 6 feet wide, 3 feet long, and 10" deep.... with a step; poured from concrete.
This weekend, I doweled and epoxyed the steel in, made the form, and poured the concrete!

Pouring concrete is HARD frickin' work!
It was about 18 cubic feet. Less than a cubic yard, so I couldn't get delivery of concrete.
I mixed 24 eighty pound bags to pour that stupid thing!

It was kind of ... awkward comming out of the CR with just a small step there... sort of a trip hazard, so... it was a good idea to put it in, I just didn't want to be told that I had to do it. :mad: And my foundation contractor should have kknown that it was a requirement.

But its in and done now.
 
Concrete sucks. I woulda bought the minimum amount and used it as backfill or something just to save my back. Shit. I;ve had 2 bags of leftover 80 pounders in my way for like 2 months, I have to move them every other day, and I hate it.

For the back wall (foundation) of my house, we had to pour a 72 foot long wall, 4 feet high, 10 inches thick of 4000 psi concrete, with rebar in it, from one end, and drag the rest down inside the forms with spades and shovels (picture paddling a canoe, only heavy heavy concrete) Man that sucked.
Last week we poured an 18 inch thick wall 40 feet long along the insed of the garage walls, it was 4 foot high too. We almost blew the forms out I was stressing hard. WE got lucky though. Now, I gotta pour the garage floor and I'm pretty much done til I can afford the driveway and sidewalk.
 
Thinking more about it, that WAS pretty crazy... couldnt you have used the rest off a truck for a little sidewalk, or picnic table pad, or a pad to set garbage cans on outside, or maybe a sculpture of a C12? That was a LOT of work for you moving all that concrete, and it would have easily been worth the cake to get a truck. Hell, the truck would have only been about $75 for a yard anyway, give or take. Ouch. Better you than me!
 
Most of them don't even like to fool with a yard.
I could have bought more, and used the rest, like you say, for a garbage can pad, but I really didn't want the truck comming down the driveway, so I would have had to wheel-barrow it down a steep grade, about 100 feet to the studio.

I rented a small electric mixer. That helped.
 
Michael Jones said:
.
432 sq. ft total.
I think it was about $700?
So that's roughly 62 cents per sq. ft.
Click to expand...
:confused: :confused: :confused: :confused:

I don't know what the hell I was thinking.
Brain Cramp!
It was 70 cents per sq. ft.
I just checked my reciept.
 
Mike,those are some very high prices your paying!I could have
bought the same amount here for$396.00.Maybe I should become
a rockwool dealer.
 
Michael, what are the bends in the ducts for? Just to get stuff all connected? It doesn't make things quieter, does it?
 
dobro said:
Michael, what are the bends in the ducts for? Just to get stuff all connected? It doesn't make things quieter, does it?
Click to expand...
It supposed to make it quieter.
The bends reduce the velocity of the air flow.
 
SHEPPARDB. said:
Mike,those are some very high prices your paying!I could have
bought the same amount here for$396.00.Maybe I should become
a rockwool dealer.
Click to expand...
Yeah. I screwed up the numbers.
70 cents per sq. ft.
For 432 sq. ft, that's about $302.40 ... plus tax.
 
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