Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

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Re: Polyester batting substitute

Posted by Jon Risch (B) on June 17, 2004 at 20:35:11

In Reply to: Re: Polyester batting substitute posted by Xenithon on June 17, 2004 at 12:12:21:

[ Is it ok then to completely cover with batting and burlap? Would a 0.25-0.5" thick layer of batting suffice to keep the fibers in or must it be 1-2" thick as in the panels? ]

It depends on the polyester density. The Hi-Loft type I recommend is at aprox. 0.5 to .7 lbs per cu. ft density, and thus, a 3/4" thickness is just enough to provide containment, while a lower density would need more thickness, and I would NOT recommend a much higher density (nothing over 1 lb. cu/ft)

[ is the published densities the fiberglass WITHOUT the bonding resins, ie. the density of the raw fiberglass before being moulded into pipe shapes? ]

I don't believe so, based on my own experiments and examination of the steam pipe insulation.

[ Finally for your SQ&D's - since 2x1m rolls may not be very sturdy on their own, is it ok to have two MDF/drywall endcaps and one in between the two rolls, to make a more sturdy 2m tall x 16" diameter trap? ]

Sure, but just the drywall endcaps by themselves will not provide that much more stability, without an outer shell (wire fence, etc) to help provide support. In the US< with the rolls compressed quite a bit, and wrapped tight, then inside a plastic bag, you can stack two or three high, and they will not tip over too easily, esp. once the bage are taped together, and they assembly covered in batting and burlap pulled taut.

Jon Risch

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