Fabric frames and formaldehyde - AVS Forum
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post #1 of 18 Old 07-02-2012, 05:34 PM - Thread Starter
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I searched for this but didn't find any discussion on the topic so...

I'm planning to do my frames with 1/2" plywood as furring strips screwed to the wall and then MDF frames attached with speaker grill ball/sockets. I actually did this for the underside of my soffit (sans the furring strips obviously) and it turned out great (thanks to Brad Horstkotte for detailing that method).

So, plywood and MDF... there's apparently a lot of formaldehyde between those two products which I'm now reading (love the Internet!) can off gas and is listed as a probable cancer causing agent. Lovely.

What's the groupthink on this? Much ado about nothing or should I maybe plan to seal these pieces before wrapping them? Also, if I'm riding the formaldehyde train either way, why wouldn't I use the cheaper OSB variety for my furring strips and save 60% which I suppose I could then put towards my future healthcare requirements stemming from this decision?
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post #2 of 18 Old 07-03-2012, 04:48 AM
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Much ado about nothing
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post #3 of 18 Old 07-03-2012, 05:13 AM
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Main problem with MDF is the fibre size when cutting - masks should always be worn. Dont ignore this risk, it is very real and dangerous.

I dont buy into the "leakage concept", you'd need to be highly sensitive chemically IMO, which isn't that uncommon, but pretty remote

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post #4 of 18 Old 07-03-2012, 09:40 AM
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First, you won't have all that much of either type of wood in the room. There's probably a LOT more in your kitchen than you will have in your theater. Second, the air in the room will be exchanged with the rest of the house (right? You will have HVAC supply and return?). Third, you won't be occupying this room continuously. Fourth, the bulk of the medical evidence I have seen indicates that if symptoms occur, they disappear once you leave the symptom-producing environment. (I'm not a doctor but my job requires that I monitor legal stuff like formaldehyde litigation.)

The upshot is that I agree with Big and Elill. Unless someone in your family is highly chemically sensitive, I wouldn't give this another thought.

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post #5 of 18 Old 07-03-2012, 09:43 AM - Thread Starter
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Excellent to hear. Thank you all.

So is there a good reason to use plywood ($26/sheet) for the furring parts instead of OSB ($8/sheet)?

And yes, this is a room in the basement, well ventilated, HVAC, not damp at all. Very dry.
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post #6 of 18 Old 07-03-2012, 03:00 PM
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I hate cutting and working with OSB other than for riser decking. For fine edge finishing like fabric frames I wouldn't even attempt to use OSB. Beveling the edges? forgetaboutit. Use either MDF or a void free plywood.

Invest in a good one:

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post #7 of 18 Old 07-03-2012, 03:03 PM - Thread Starter
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Originally Posted by BIGmouthinDC View Post

I hate cutting and working with OSB other than for riser decking. For fine edge finishing like fabric frames I wouldn't even attempt to use OSB. Beveling the edges? forgetaboutit. Use either MDF or a void free plywood.

Yeah, I'm going to use MDF for the actual frames just because t routes beautifully. However, I need something to fasten to the wall to attach the grills to with the speaker ball/guides (furring strips basically) so I was going to use OSB for that. Thoughts?
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post #8 of 18 Old 07-03-2012, 03:19 PM
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I hate working with OSB. Your drill holes for the ball and sockets will be a little sloppy, Just the nature of working with OSB and the large glued together chips of wood waste products.
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post #9 of 18 Old 07-03-2012, 03:34 PM
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I hate working with OSB. Your drill holes for the ball and sockets will be a little sloppy, Just the nature of working with OSB and the large glued together chips of wood waste products.

Me too. Here's an example where I chose OSB instead of plywood/solid wood for my head over my stage. The outer edge ended up coming apart and I had glue and clamp it.

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post #10 of 18 Old 07-04-2012, 01:36 AM
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Oops, if that's true, I'll be dead in a few months. About 90% of my theater is constructed out of MDF eek.gif

Reminder to self: Tell wife to sue the crap out of the MDF manufacturers when I kick the bucket. biggrin.gif
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post #11 of 18 Old 07-04-2012, 07:20 AM
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I'm sure you'll be fine with the MDF and ply.

You're not planning on using and of that radioactive granite are you? biggrin.gif
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post #12 of 18 Old 07-04-2012, 01:20 PM
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You're not planning on using and of that radioactive granite are you? biggrin.gif

now you've struck too close to home as my wife has eliminated that from any future kitchen projects for just that reason. Offering to have a particular choice tested is of no use.
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post #13 of 18 Old 07-05-2012, 04:43 AM
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Go with marble or slate then. Just had slate installed last summer and love it. Scratches can be sanded out if desired, sealed with Mazola corn oil (just once), nothing stains it. Similar to soapstone I suppose. Many more options out there aside from granite.
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post #14 of 18 Old 07-05-2012, 01:02 PM
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Maybe they'll start mining the man made glass from the Trinity Site to build counter tops.
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post #15 of 18 Old 07-06-2012, 05:05 AM
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That would be cool. It's only "mildly radioactive"according to wikipedia.
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post #16 of 18 Old 07-06-2012, 04:07 PM
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Originally Posted by Unacceptable View Post

Excellent to hear. Thank you all.
So is there a good reason to use plywood ($26/sheet) for the furring parts instead of OSB ($8/sheet)?
And yes, this is a room in the basement, well ventilated, HVAC, not damp at all. Very dry.

For furring, just use cheapo plywood, like sheathing - when I got mine, it was on sale (1/2") for under $8.
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post #17 of 18 Old 07-08-2012, 07:46 AM - Thread Starter
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Quote:
Originally Posted by Brad Horstkotte View Post

For furring, just use cheapo plywood, like sheathing - when I got mine, it was on sale (1/2") for under $8.

Is it treated or untreated? I'm hoping the latter.
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post #18 of 18 Old 07-09-2012, 08:10 AM
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Is it treated or untreated? I'm hoping the latter.

Untreated - yeah treated would probably not be a real good idea
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