The rafters and ridge beam come from a local tree called tzajokché (pr. Tza-hock-chay), which needs chemical protection from bugs but is otherwise ideal due its long length, straightness and low density. It’s also local and quickly renewed if the harvest is well managed. Another popular tree for this is lema’, which is even lighter but more prone to insect attack.
The roof stringers are the same material as the wall straps: Mexican weeping bamboo. However, we treated these ones in a solution of boric acid and borax to keep bugs and mould out. The bamboos in the wall don’t need any chemical protection because they’re encased in mud, which keeps out both insects and moisture – even killing what bugs might have gotten in during the build! I’ve seen 50-year-old houses demolished and the bamboos were as good as new.
And a human can carry about 25 of them! I consider myself tougher than most but I couldn’t carry more than 20. This guy, a 50-year-old father of six, carried more this day than any of the younger guys, many of whom carry building materials as their full-time job. I have utmost respect for their strength, stamina and resilience.
It’ll gradually turn grey over the next month, and it’ll weigh around half what it does at this point too – we had to put in extra bracing to help the rafters cope with the wet weight.
Next comes the walls – in part 3…