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north star

Sawhorse
Joined
Oct 19, 2009
Messages
4,060
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** Joshua.A **, ...Welcome to the Building Codes Forum !

Please define cob !

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my250r11

Sawhorse
Joined
Feb 16, 2015
Messages
814
Location
Roswell, NM
NM calls it RAMMED EARTH CONSTRUCTION. We have a state code for these type of structures. Also covers what is called around hear as ADOBE.
 

Paul Sweet

Sawhorse
Joined
Oct 17, 2009
Messages
1,578
Location
Richmond, VA
Earth structures are more appropriate for the desert Southwest than in a humid, rainy climate such as Florida. It would require an impervious facade, wide overhangs to shield from driving rain, and be raised above the ground with an impervious membrane to prevent groundwater rising by capillary attraction.
 

Mark K

Platinum Member
Joined
May 12, 2010
Messages
1,808
Rammed earth, Cob construction, and adobe construction are not appropriate for buildings subject to earthquakes. It is ill advised to include provisions for these types of structures in the IRC. Such systems are not compatible with the IBC.

From a technical perspective this is a BAD idea.
 

tmurray

Registered User
Joined
Jun 10, 2011
Messages
2,032
Location
NB, Canada
We had someone do this in our province a number of years ago. I'm not sure how it has held up over time. I kept imagining that a water permeable product and freeze-thaw cycles do not mix well.
 

e hilton

Bronze Member
Joined
Jul 2, 2014
Messages
1,589
Location
Virginia
Cob is a misleading title, where does it come from? Rammed earth is not made of kernals.
Cob building gets its name from the Old English term for “lump” which refers tomthe lumps of clay rich soil that were mixed with straw and then stomped into place to create monolithic earthen walls.
 

ADAguy

Sawhorse
Joined
Sep 11, 2013
Messages
5,662
Location
California
So a corn cob is shaft covered in lumps? Hmmm. Doesn't seem to describe rammed earth given that rammed implies pressed or jammed between form boards.
 
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