Shrinkage varies with the formula for your mix, including the amount of water used. Just paper and cement will shrink about 10% while draining. After the initial setup there will be some additional shrinkage over time. With added sand, clay, pumice, etc. the shrinkage will be less. Additives also affect drying time. To find out the shrinkage your recipe will have, make a batch and some test blocks.
You probably don't need the corner posts, especially if you go up to 12" walls. Some papercrete vets say that walls thinner than 12" are not so great. A bond beam from either concrete or wood is a good idea.
A barrel vault formed with rebar ribs covered with poultry netting or stucco mesh would make a nice roof. There's always conventional joist roof design. Just remember that wet papercrete is heavy. Not a problem with walls sitting on the foundation but a definite concern with a suspended roof. Now if it was round I would suggest a geodesic frame roof, but then I'm a domehead : )
spaceman All opinions expressed or implied are subject to change without notice upon receipt of new information.
On 8/5/2010 4:14 AM, carlsondanjames wrote:
First off I would like to say 'You guys/gals are awesome!!'. I love like minded people. Everyone I talk to about papercrete looks at me like I have two heads. My first papercrete project will be a shed in the backyard. Something that looks like a small cottage with a 3' front porch, front door with windows on either side. I was thinking 12' X 10' with 8' walls, 8' double doors in the side. Foundation of cement block 12" below and 12 above grade. Framing would consist of rough cut lumber, 4x4 posts for the corners plus frame work for the doors and windows, topped with 2x4. I am now thinking that shrinkage is going to be a problem and the framework will have to go and make the walls 10" wide and load bearing. The roof is also bugging me because I want it made of papercrete as well but I need some suggestions on how to make that work. My paper material will be box cardboard, recipe will be barrel filled with pre-soaked cardboard, 1/2 bag of cement, filler ? (don' know yet) probably sand. My mixer is going to be a 45 gallon plastic barrel with a 3" waste outlet that they use in campers, the mixer is going to be a 1/4 hp electric motor with a pulley connected via a belt to a 3 1/2' metal shaft with mixing blades on it. In a 10" thick wall what is the width shrinkage? Does it shrink in the length? Thanks Dan ------------------------------------ Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/papercreters/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/papercreters/join (Yahoo! ID required) <*> To change settings via email: papercreters-digest@yahoogroups.com papercreters-fullfeatured@yahoogroups.com <*> To unsubscribe from this group, send an email to: papercreters-unsubscribe@yahoogroups.com <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.851 / Virus Database: 271.1.1/3051 - Release Date: 08/04/10 09:07:00
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