Fast Company published a good article [1] about the Precious Plastic effort [2] to spread open source DIY machines that recycle plastic. I hope someone helps them publish plans for a limonene-based styrofoam recycler as well, as that is supposedly a fairly simple reaction. Then agree upon standardized sizes, and manufacture bricks of plastic-encased styrofoam insulation, where the plastic casing is designed to interlock into near-airtight joints. Then pump out insulation for the housing of the co-op members helping, 4-5 feet thick, and you start creating near PassivHaus-grade insulation.
Use other plastics to create a mechanically interlocking building envelope perhaps, and thermal bridge isolation pieces, and you could drive ACH in the way building down.
Other uses for recycled plastics that would help those who are short on capital but long on sweat equity might include really large fan blades for whole room ceiling fans, shelving, storage boxes, body weight equipment like traveling rings, and playground equipment. All of these don't need to be sophisticated, and confer allow the capital-constrained to avoid having to use as much capital.
Use other plastics to create a mechanically interlocking building envelope perhaps, and thermal bridge isolation pieces, and you could drive ACH in the way building down.
Other uses for recycled plastics that would help those who are short on capital but long on sweat equity might include really large fan blades for whole room ceiling fans, shelving, storage boxes, body weight equipment like traveling rings, and playground equipment. All of these don't need to be sophisticated, and confer allow the capital-constrained to avoid having to use as much capital.
[1] https://www.fastcompany.com/40486883/these-diy-machines-let-...
[2] https://preciousplastic.com/en/index.html