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Sustainable Alternatives: Rice Hulls

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darius

darius
So.App.Mtns.
United States
(Zone 5b)

February 26, 2007
12:06 AM

Post #3224998

Recently I have viewed some interesting sites about using rice hulls for insulation. They are a throw-away and as insulation, perform as well as fiberglas insulation at as little as 1/5 the cost, depending on transportation costs.
http://www.axwoodfarm.com/PAHS/RiceHulls.html

I plan to try these as wall insulation in the low 3' walls of the GH I hope to build this summer, and from there... who knows?
summerkid
Rose Lodge, OR
(Zone 8b)

February 26, 2007
12:28 AM

Post #3225064

Interesting, darius. I might give it a shot when converting one end of my garage to a studio. It's a small enough project that it allows experimentation.
spot8907
Ida, MI

February 26, 2007
12:33 AM

Post #3225080

Great article darius. Interesting especially since I just saw an add for rice hulls in my MNLA magazine before I got on line. Anybody used rice hulls for mulch out there? I'm thinking they would probably not be good in windy areas. I never imagined you couls use them as insulation. I love this new forum, so much interesting stuff out there!
pepper23
KC Metro area, MO
(Zone 6a)

February 26, 2007
12:47 AM

Post #3225127

You can also use denim as insulation that is waterproof and mold proof from what I have heard. BUT they cost more than fiberglass. We checked it out 2 yrs ago for my grandma's house but it was way too much. That is interesting about the rice hulls. Let us know if you do it and how it works out.

darius

darius
So.App.Mtns.
United States
(Zone 5b)

February 26, 2007
12:12 PM

Post #3226145

spot... I had thought about rice hulls for mulch... and then I thought, "Hey, they are 20% silica (sand)" and when they break down in my clay soil, will I have cement? LOL.

pepper, one thing that interests me about insulating with rice hulls is that they don't settle. Like your denim, they don't mold either. I'd worry about any fabric in a wall cavity being a fire hazard.
pepper23
KC Metro area, MO
(Zone 6a)

February 27, 2007
12:40 AM

Post #3228298

They spray the denim with fire retardant. I remember that much. That was about all they had to do to them besides washing and drying and shaping.
spot8907
Ida, MI

February 27, 2007
1:22 PM

Post #3229812

Denim is made out of cotton, it doesn't mold? Or are talking about something other than what blue jeans are made of?

darius

darius
So.App.Mtns.
United States
(Zone 5b)

February 27, 2007
3:18 PM

Post #3230137

pepper, you make a good case for me to use rice hulls!
pepper23
KC Metro area, MO
(Zone 6a)

February 28, 2007
1:00 AM

Post #3232543

LOL!! google it and see what you find.
AYankeeCat
Fairfield County, CT
(Zone 6b)

March 11, 2007
10:44 PM

Post #3271573

I thought that the denim insulation was actually layers of lint made out of the denim - at least that is what the picture looked like.
iagardenwolf
Ankeny, IA
(Zone 5a)

March 12, 2007
2:26 AM

Post #3272137

At work we get rice hulls to test. I end up taking the samples home and put them in my compost bin.

I've never heard of rice hulls for insulation before. I do know in terms of feed, rice hulls can be a cheep, but I don't know. I think it will take a few years before I could seriously insulate any walls though as our samples are quart size! LOL
garden_mermaid
San Francisco Bay Ar, CA
(Zone 9b)

March 12, 2007
7:36 PM

Post #3273982

Rice hulls are frequently used for Bokashi composting. I'm not sure I believe that they don't mold. Perhaps they are not susceptible to certain types of mold, but they do break down with the compost.

darius

darius
So.App.Mtns.
United States
(Zone 5b)

March 12, 2007
9:23 PM

Post #3274276

What's Bokashi composting?

darius

darius
So.App.Mtns.
United States
(Zone 5b)

March 12, 2007
9:44 PM

Post #3274330

I meant to add that the report of rice hulls not molding was in regard to their use in a wall cavity under normal house conditions.
garden_mermaid
San Francisco Bay Ar, CA
(Zone 9b)

March 13, 2007
7:21 PM

Post #3277535

Bokashi is a style of anaerobic composting developed in Japan that uses an Efficient Microbe (probiotic) innoculant.
http://www.embokashinetworkusa.org/howtomakeembokashi.html

darius

darius
So.App.Mtns.
United States
(Zone 5b)

March 13, 2007
8:42 PM

Post #3277825

Thanks.
bluekat76
Ijamsville, MD
(Zone 6b)

March 16, 2007
11:39 PM

Post #3290258

We tried it for awhile but we produce too many scraps too fast. We would need a couple more buckets and more patience to let it sit before diggin a hole (yes, actual work) for the fermenting product. Not stinky at all though.
garden_mermaid
San Francisco Bay Ar, CA
(Zone 9b)

March 17, 2007
11:44 PM

Post #3293337

I bought one Happy Farmer bucket and then have been using regular 5 gallon buckets with lids. I can fill a 5 gallon bucket with kitchen scraps in about 5 days. Some goes into the worm bin (Wriggly Wranch), some goes into a bokashi bucket and the rest goes into the BioStack at the community garden.

The first time I buried the Bokashi, I witnessed earthworms "running" across the surface of the soil and then diving into the spot where I buried it. They really love the stuff.
gloria125
Greensboro, AL

March 18, 2007
5:45 PM

Post #3295461

I would like to use rice hulls for insulation if I could find a source for it. My garage is unfinished on the inside. My rabbit stays there in the winter and it gets really cold for him. thinking about plastic bags of rice hulls, used sand bag style between the studs. tack screen molding across the studs to keep the bags in place. Guess I could use packing peanuts, also.

darius

darius
So.App.Mtns.
United States
(Zone 5b)

March 18, 2007
6:08 PM

Post #3295530

Rice hulls will insulate better. I'd think about some kind of screen or hardware cloth across the studs and loose insulation inside the cavity. AL isw one of the top rice producing states so I'd think you could find rice hulls with some effort. Good luck! and let us know what you do...
garden_mermaid
San Francisco Bay Ar, CA
(Zone 9b)

March 18, 2007
11:28 PM

Post #3296696

Gloria, here is a supplier in Arkansas:
http://www.ricehull.com/loading_shipping/

Apparently rice hulls are used for horse bedding, biomass energy and composite wood products.

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