What is this insulation

[charlie]

Hello all,

I posted this request for info about this insulation material on another forum and didn't get much response. In the picture, the small dark grey material at the center is rock wool, the lighter grey is standard cellulose fiber, and the blond material is __________? It appears to be some sort of cellulosic material ranging from small sawdust like particles to one inch shreaded-like strands. I have seen the material over the years remodeling but never had to call out what it was. Is it treated with fire retardant etc. Any feedback would be greatly appreciated,

Charlie

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[kurt]

It's called Balsam Wool around here (Chicago). Sometimes I see it encased in an asphaltic paper batt. It's ground up pine trees, I think.

[charlie]

I am familiar with Balsam Wool----primarily installed prior to 1945. This stuff was installed in the early 80's and isn't nearly as powdery as Balsam Wool.

[hausdok]

Hi,

It was sold out here under the brand name Silvawool. It's essentially shredded wood fiber.

ONE TEAM - ONE FIGHT!!!

M.

[Les]

If it is not "powdery" likely it is kelp/seaweed. Especially in your area. It was available in the 80's and treated usually with a borate. Really can't tell too much from the picture.

[hausdok]

Nope,

It's Silvawool. I see the stuff 6 or 7 times a month. It's shredded wood that's been borate treated.

OT - OF!!!

M.

[charlie]

Thanks for the help, I finally found this info:

SILVA WOOL: This is a product manufactured by the lumber industry. It consists of wood slivers treated with a fire retardant. The most common wood appears to be cedar that is resistant to rot and pests. The insulating qualities are quite good, however the quantity is often inadequate by today’s standards and additional insulation should be installed.

[Neal Lewis]

I've messed around with alot of the balsam wool in my house from the 20's. It's nasty stuff to work with and really sticks to your skin if you have worked up a sweat. I'd rather deal with seaweed!