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<gallery>
<gallery>
Image:oven face view.jpg|Face view of the oven, Oct. 2014
Image:oven face view.JPG|Face view of the oven, Oct. 2014
Image:Example.jpg|Chimney lost due to vandalism.
Image:Oven vandalism.JPG|Chimney lost due to vandalism.
Image:Example.jpg|Workbench and cabinets partially exposed.
Image:workbench exposure.jpg|Workbench and cabinets partially exposed.
</gallery>
</gallery>



Revision as of 05:28, 20 October 2014

The Cobb Goblins

Abstract

The purpose of this project is to create a low embedded energy, natural, beautiful way to cook pizza. The project will be a collaborative effort including Laurel Tree Charter School, its students, Humboldt State University, our team, and the local community to demonstrating the ability to apply sustainable practices by designing products for use in daily life.

Background

The Cobb Goblins were commissioned in the Fall of 2012 as a part of Engineering 215, to design and construct an earthen pizza oven for Laurel Tree Charter School. Laurel Tree's mission is to create a sustainable model of education which provides all students with accessible curriculum, based on college preparatory standards, while developing life and socials skills in a mixed age setting.

Problem Statement and Criteria

The objective of our design is to create a sustainable, beautiful, safe, long-lasting, and functional outdoor oven for baking and cooking. The oven will be used weekly for children's pizza lunches and for the occasional school event or fundraiser. Table 1 shows the criteria created by our team in collaboration with Laurel Tree. These criteria were weighted to help choose a design that best fit the client's needs.

Table-1: Criteria and Their Importance
Criteria Importance
Safety 10
Construction Time 10
Effectiveness 9
Durability 8
Usability 7
Sustainability 7
Aesthetics 6
Student Involvement 6
Cost 5

Description of Final Product: Ovenly Inferno

Oven Layers

Inner Thermal Layer

This layer retains heat from firing and radiates it back into the oven chamber. The mixture recipe for this layer is 1 part clay, 1 part sand.

Insulation Layer

This wooly looking layer insulates the inner layer and keeps heat from dissipating into the environment. The mixture recipe for this layer is 1 part clay, 1 part sand, and 5 parts straw.

Outer Cobb Layer

The straw in the outer cobb layer provides the tensile strength need to make the oven sturdy. This layer is also useful for applying designs to the oven's exterior. The mixture of this layer is 3 parts clay, 3 parts sand, and 1 part straw.

Lime Plaster

Lime plaster is applied after the inner layers have fully dried. This layer protects the oven from the environment.

Addition Features

Counter Top

A laminate counter top was mounted to the side of the oven and held up by reclaimed wooden beams.

Wood Storage

The counter top provides space below for wood storage.

Chimney

A half inch thick cardboard tube was covered with thermal and cobb layers and used as an anterior chimney to the oven.

Adjustable Oxygen Intake Door

A wooden door drilled with holes and a sliding plank allow varying levels of oxygen into the oven for different fire strengths.

Oven Door Concept Art by Sara Newell

Completed Oven

Fig. 2 Ovenly Inferno Complete
Fig. 2 Ovenly Inferno Complete

Materials/Costs

As many materials as possible were obtained used. Table 2 details the total materials and costs for constructing Ovenly Inferno.

Table-2: Materials and Costs
Quantity Material Cost ($) Total ($)
27 Firebricks 1.95 52.65
4 Mortar (60 lb. bags) 8.50 34.00
7 Masonry Sand (100 lb. bags) 11.00 77.00
3 Tarps 10.00 30.00
1 Straw (bale) 9.00 9.00
1 Work Gloves (box) 9.99 9.99
1 Trowel 3.50 3.50
1 Plywood (4'x8') Donated 0.00
1 Mallet Donated 0.00
80 Red Bricks Donated 0.00
1 Ton of Urbanite Donated 0.00
40 Glass Bottles Donated 0.00
2 Wooden Beams (4"x10"x36") Donated 0.00
1 Countertop Donated 0.00
1 Riversand (cubic yd.) Donated 0.00
1 Roll Ducttape Donated 0.00
1 4' Level Donated 0.00
Assorted Hardware Donated 0.00
1 Wheelbarrow Borrowed 0.00
1 Soil screen Borrowed 0.00
2 Shovels Borrowed 0.00
1 Wheelbarrow Borrowed 0.00
Truckloads Clay soil Gathered from source 0.00
Total Cost $216.14

Results

Ovenly Inferno is successful in producing enough pizza for the whole school during lunch time. It requires 1 ft^3 of wood to fire it in 2 hours. The oven's peak temperature is ___*F and after cooking __ pizza's the temperature is ____*F. The counter space provides adequate preparation space and the fuel is kept close in the wood storage.

Video

D.I.Y

File:Newell_brickfooter.jpg
How To Build An Earthen Oven

Maintenance

The oven will need to undergo a lime wash every five years. This wash will heal the lime plaster of any cracks that may develop. The oven should be fired

Discussion and Next Steps

  • Many cracks have begun to form, possibly due to firing it too hot in order to dry it. These cracks will need to be patched.
  • As soon as the out cobb layer has dried, a layer of lime plaster will need to be applied to protect from the wet climate of Humboldt County.

Cobb Goblins

Update October 2014

References/Further Reading

  • Bee, Becky. (1997). “The Cobb Builders Handbook: You Can Hand-sculpt Your Own Home.”

Groundworks, Murphy, OR. Accessed online <http://www.weblife.org/cob/ > (Sept. 22, 2012).

  • Ben. (2012). “Pizza! This time permanent” Flirting with Yurting.

<http://www.flirtingwithyurting.com/?p=459 > (Oct. 7, 2012).

  • “Blue Ox Earthen Oven.” (2011). Appropedia

<http://www.appropedia.org/Blue_ox_earthen_oven> (Sept. 23, 2012).

  • “Building an Earthen (Cob) Oven,” (2011). Sunstone Farm and Learning Center.

<http://sunstonefarmandlearn.com/2011/03/24/building-an-earthen-cob-oven/> (Sept. 24, 2012).

  • Denzer, Kiko. (2002). “Build your own Wood-Fired Earth Oven.” Mother Earth News, (194), 70-74. EBSCOhost (Sept. 22, 2012).
  • Denzer, Kiko. (2008) “Oven dome height for different size ovens.”

<http://kikodenzer.blogspot.com/2008/07/oven-dome-height-for-different-size.html> (Oct. 7, 2012).

  • Denzer, Kiko with Hannah Field. (2007). “Build Your Own Earth Oven 3rd Ed.” Hand Print Press, USA.
  • Galloway, Willi. (2012) “Backyard Earthen Oven.”

<http://www.digginfood.com/wp-content/uploads/2009/07/cure-firing.jpg> (Oct. 9, 2012).

  • “Guidelines for the Installation and Use of Open-air Barbeques”.

(2008). Department of Environmental Health Food & Housing Division. <http://www.sdcounty.ca.gov/deh/food/pdf/publications_openairbbq.pdf> (Sept. 23, 2012).

  • Grimmer, Anne (2011). “The Preservation and Repair of Historic Stucco” Preservation

Brief, National Park Service, US Dept. of Interior. <http://www.nps.gov/hps/tps/briefs/brief22.htm> (Sept. 24, 2012).

  • Hauk, Marna and Heindsmann, Emily. (1998). “Building with mud!” Communities, (99), 36-40. EBSCOhost (Sept. 22, 2012).
  • “HBCSL cobb oven.” (2012). Appropedia.

<http://www.appropedia.org/HBCSL_cobb_oven> (Sept. 23, 2012).

  • Hernandez, Carolyn. (2012). “Building an Earth Oven.” Wild Earth Builders.

<http://wildearthbuilders.com/files/IMG_1004.jpg> (Oct. 7, 2012).

  • “Kitchen & Bath Industry Dimensional Guide.” (2011). Kitchen and Bath Center,

<http://www.mwknb.com/KBC%20Industry%20Dimensional%20Guide.htm> (Nov. 8, 2012).

Statement.html> (Sept. 24 2012).

  • “Oven.” (2012). Merriam-Webster Dictionary,

<http://www.merriam-webster.com/dictionary/oven> (Nov. 29, 2012).

  • Shimpock, Mike. (2012). “My Pizza Oven.”

<http://slice.seriouseats.com/assets_c/2010/08/mike-s-mpo-fin-106390.html> (Oct. 7, 2012)

  • Smith, Michael G. (2000). “Cobb Construction.” Green Home Building.

<http://www.dcat.net/resources/buildingstandards_Cobb_articles.pdf > (Sept. 24, 2012).

  • Southwick, Marcia. (1994). Build With Adobe. Swallow Press, Athens, Ohio.

2012).

  • “Peoria to Open Scotland Yard Park.” (2012). City of Peoria Press Release.

<http://www.peoriaaz.gov/NewsPR2.aspx?PID=1690&id=54035> (Sept. 22, 2012).

  • “Pizza Pans”. (2012). Abest Kitchen.

<http://www.akitchen.com/store/pizzapans.html> (Sept. 23, 2012).

23, 2012).

  • Smith, Michael G. (2000). “Cobb Construction.”

<http://www.greenhomebuilding.com/pdf/buildingstandards_cob_articles.pdf> (Sept. 24, 2012).

  • Southwick, Marcia. (1994). Build With Adobe. Swallow Press, Athens, Ohio.
  • “What Every Member of the Trade Community Should Know About: Classification of Cooking

Ranges, Stoves and Ovens.” (2008). U.S. Customs and Border Protection. Washington, D.C.<http://www.cbp.gov/linkhandler/cgov/trade/legal/informed_compliance_pubs/icp086.ctt/icp086.pdf> (Sept. 23, 2012).

  • “Wood Burning Brick Oven: Construction and Cooking” (2002). Ozarkdreams.

<http://www.ozarkdreams.com/BrickOven.htm> (Oct. 8, 2012).

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