EcoShield ( <-- don't click this link, it's added by the forum) looks like (per Google) an acoustic cotton product produced by Titus, who makes HVAC and insulation equipment and supplies. They market it mostly as a duct liner, but the press release says it should behave thermally and acoustically like fiberglass. Acoustic cotton is not as common among DIY acoustic designs as it is in pro designs (it seems to me). Commonly BPape and The Erskine Group specify it for absorption on walls. I was reading about it earlier today, where I read (no link, but my clicking started in damelon's thread) that it was more expensive than glass, but performed slightly better in some lower frequencies (around 250 Hz) in terms of absorbing sound.
More developments tonight. I didn't get around to putting the sand into the stage tonight, but some of the 3/4" tops were added to both the stage and the riser. The curve behind the front row should wrap the curved seats nicely!
We were able to get another layer of OSB added to the steps leading to the front row. Roofing felt was put in between the layers again. The front stage step OSB layer was also cut to fit. It actually worked out really nice since the front stage is just under 4' deep. So the remnant used from the top of the stage fit perfectly on the step below. He just traced the curve 11" away from the first cut. We used 1/2" MDF for behind the front row seating. I'll either paint it black or apply some type of fabric treatment to it. Probably just paint it black since it won't be visible.
I've never seen OSB look so good. A bonafide work of art.
Dying to see how closely the real thing resembles those amazing renderings...even though I still vote for the tan.
Thanks David. After a couple beers, my friend Brian's cuts really become more fluid. Funny you should ask about it matching up with the renderings. Here's a composite image of the rendered room combined with the actual photo.
Looks like we've stuck pretty close the actual plan thus far.
Awesome Build! Great project to follow. I hope to start my basement theater soon but yours will be the unobtainable dream for me right now. Subscribed! Keep up the great work!
Thanks for tagging along with me and good luck on your theater. It's a journey. While I didn't take advantage of it, I'd check out some of the pro services offered here on the forum from guys like Dennis. It would have been money well spent and saved me tons of research.
Officially moved about 500 lbs of sand last night. Only about a ton more to go.
You bet. I could shoot some video. I'll need to test it out prior to adding the top layer of 3/4" osb to it before carpeting so I can fine tune how much perimeter I'll need to allow the platform to move. I'd like the carpet to be as seamless as possible between the platform deck and the riser.
Man I am so jealous !!! But one detail i have to know. The distance between the stage and the riser is really small, do you think it was worth the effort ?
Yeah - I ended up deciding to keep that just because it helped with the look of the stage. I wanted two steps on the front stage. If I bumped the stage up another 7" I wouldn't be able to fit a sub in the front middle of the room and still squeeze under the screen.
I finished filling up half the stage with sand last night. Looks like I'll be about 7 bags short to complete the other half. The sand from Lowe's was all dry which was nice.
While I know the plastic is there to contain the sand, am I trying to completely seal the top so no water can penetrate in? Or should I just be more worried about creating a bottom shell? I imagine once two layers of 3/4" cover the top, that water would ever find it's way into it.
I finished emptying all of the remaining sand bags into the other half of the stage. Looks like I'm about 10 bags shy. So I'll pick those up tonight and finish that phase up.
I need to zero in on the construction of the false screen wall next.
For the some of the side walls, If I'm putting one inch acoustic material on the wall, should I furring out the wall exactly 1" or should I plan for 1.25" to make sure the material doesn't push against the GOM fabric?
Another composite image I created blending reality with vision: