Awesome little video! Thanks so much for sharing this with folks here... I am sure many will love it, and become inspired. I just got an email yesterday from Charlie......glad to see him there in the thick of it all doing a project. What a great thing you folks are doing down there. I will get there eventually...I am truly looking forward to teach a timber framing workshop with you and Charlie as soon as I can find the time.
Was the material being troweled into the bamboo lath some form of natural lime Bajareque method? It wasn't concrete was it? Please tell us more about what we are seeing in the video and say hi to Charlie for me.
posted 5 years ago
Thanks J !
You are seeing a number of different wall systems here. I am going to have a comprehensive post about all the different wall systems soon (we have about 8 different wall systems). The material being troweled into the lath is a lime and sand mix. The other material is an earthen mix with needles. In all we used a wooden lath, bamboo lath, bamboo board, and woven bamboo for the wall. To give you a sneak peak of our findings in the study, the lime and sand mix with wooden lath out performed in most areas and was a lot cheaper.
We did not use concrete (which is hard to do) it is a wonderful material other than the fact that it is incredibly energy intensive.
I am looking forward to A timber framing course! And I will say hi to Charlie.
I thought it was a lime parging of some type...Glad to here you are using that. No love loss with me and concrete (other than some of the Natural Concretes and polycretes) I don't support OPC or the companies behind them personally and would only use lime or clay matrix for an application such as you are showing in the video...good job on that again. If a contract spec's out OPC or a client requests it...I will use in under duress and ask they sign a waiver holding me harmless in any way from its use or application. OPC's carbon foot print just is not sustainable in the long run, you are correct...way too much embodied energy compared to more natural mass materials.
posted 5 years ago
To make the lime mix: We used raw lime slacked (wet) it added 2/3 of sand and then a week later we knocked it up and added the rest of the sand). The wall is also really heavy!
What is lime parging ? From what I understand it is a mix/process used between/ or the surface of brick, stone or concrete.
Not only is it energy intensive to make but the process actually releases CO2. However, self healing concrete is pretty interesting: http://www.asknature.org/product/cd6ff82750db9c9c7490b071e5a6b4d4 "uses microfibers in the place of coarser bits of sand and gravel that traditional cement mix uses. The fibers allow the final composite to bend with minimal fracturing and if fracturing does occur, the cracks tend to be less than 50 microns wide..."
Also there is http://www.sciencedaily.com/releases/2009/09/090929141534.htm geopolymer concrete by using waste byproduct from coal fired power plants and help curb carbon dioxide emissions. As well as concrete without quarries. Check out the PDF attached below explaining how you can make concrete. the formula is Calcium chloride combined with Sodium hydroxide to make Sodium chloride and Calcium hydroxide into Calcium Carbonate.
I would also like to learn more about Tadelakt do you have any resources/information on the subject?
Charlie would like to know if you got his recent message about teaching a timber framing course.