1 Hour First Floor
2021 Milestone: OSE has achieved a replicable method where an unskilled swarm under professional guidance can assemble the framing for a 500 square foot first floor (living structure is 1000 sf heated space - 2 floors) - in one hour. 24 people participated at 50% involvent. Method is predicted to scale to double this rate, accounting for the 50% 'sit around and watch' factor. Method can scale in the number f participants up to the physical limit of how many people can make it on site. Implications are significant.
Walls only take 1 hour and 18 minutes in the above video - see minute 1:52 for the next 52 seconds. Time Lapse Calculator (https://www.photopills.com/calculators/timelapse) says that at a 3 second interval of this video and 30 fps playback, the actual duration of 1 hr 18 min. Also - 1:52 - 4:13 shows 2:21 minutes of time lapse for completion up to the 2nd floor subfloor joists. Rim boards included. Time Lapse Calculator says the duration up to this point is 3.5 hours.
That is with multiple teams. One team does 8 modules in front from 1:52 - 2:21 - or 29 seconds at 3 second shooting interval, played at 30 fps. Thus, 7.3 minutes per module per team. Double door counts as 2 modules. More about data collection at https://wiki.opensourceecology.org/wiki/Seed_Eco-Home_3_Data_Collection
External comment: This is really great. We have the information and knowledge to build our own homes and your direction here really helps folks to see that reality.
I'm reviewing - 75 minute for 24 modules - with 2 teams - or 75 minutes per 12 modules per team - thus 6.3 minutes per module per team. Note that each active team has 3-4 people actually installing the module. Thus, if we have all the modules prepared ahead of time - 6-8 people can build the entire first floor in 75 minutes. Further, if we divide the build to start from 4 corners, the build time for the first floor becomes 38 minutes - with only 12 people. This is remarkable, indicating (with other build data) extremely rapid build times that allow a house to be finished with a 12 person crew in 5 days, or 500 hours. Our stated goal for the OSE Apprenticeship of early 2023 is one week builds with 24 people, and we should be able to achieve this readily.
To review - the next milestone is 5 days for complete build with interior and exterior, starting from foundation to PV. As we start the 2025 Apprenticeship, the goal is to teach a crew of 24 people to do this. Interior finishing details are formidable as there are simply a lot of steps. Once we train 24 people to do 5 days builds, we estimate that an unskilled crew of 24 could finish an entire 1300 sf 3 bed 2 bath house in 10-15 days. However, with 48 unskilled people (with skilled guidance) - we predict that we can complete the same house in 5 days.
Industry Standards
Other community projects take about 60 poeple at much greater sizein one day: