With more than a bit of trembling and worries, and innumerable phone calls to friend and expert eco-friendly architect Alejandra Caballero, the green roof is on!!! and it doesn't leak!!!
ay les va las fotos... photos and description follow...

My mini kitchen is built with adobe bricks. Crosswise we first placed a large beam, then 2x4's lengthwise- we painted all with linseed oil to deter pests a bit. The 2x4 are placed about 20 inches apart, which might be overdoing it, but forgot to ask Alejandra this. Then on top of the 2x4's we tied off branches of the local "chapulixtle" - i owe you the scientific name, but it's native.

View from above, Don Miguel and Javier tying the chapulixtle branches with ixtle string.

On top of the chapulixtle I put an old piece of plastic (it has holes in it) this is to prevent the chapulixtle from puncturing the "good" plastic, which will be the impermeable layer. At this point it's very important to place the drainage pipe where you want it and start molding the plastic around it, afterwards it'll be too late. To avoid PVC pipe, I used a plastic hose. Then I put "cob" (a mud and cow manure mixture) around the sides and bottom of the roof - like a huge "U" - leaving a space for the hose. Then gravel inside the cob border, which works to assist water run-off to where we want it- at the bottom corner.

Next is the good plastic - this is a UV-resistant plastic often used in water reservoirs (but it isn't a permanent solution when directly exposed to the sun). I got this instead of a thick black plastic (like the hole-y one in the previous photo) because the other wasn't available in the size I needed. Rats. As it is rather thin, I went ahead and used a double thickness. Then I took out the black hose from where it was and put it on top of the green plastic, with the cement block to hold it in place.

This is where I really started getting nervous - applying the 4 inch layer of porous volcanic gravel (1-1.5 in) and levelling it off. Would I break the plastic???
Por las dudas que no me creen que estoy arriba del techo, Javier me dice que hay que tomar la foto de lejos - es su dedo a mano izquierda.


How do you measure 4 inches of gravel??? with your handy-dandy measuring stick!!! rule number one: DON'T POKE IT THROUGH THE PLASTIC!!! Levelling is done with the piece of wood.
Ya que ponía la grava, tapé la manguera de desagüe con tela mosquitera (lo cual no se ve) y grava, y revisé la caída de agua por medio de la tecnología muy avanzada de echar una cubeta de agua al techo. ¿ y qué creen? ¡se drenó el agua por la manguera! ¡un

When the roof was covered with the gravel, I covered the entrance of the drain "pipe" (hose) with plastic mosquito mesh (you can't see it in this shot), then covered it completely with gravel. We checked water run-off through the hi-tech method of throwing a bucket of water on the roof. Believe it or not, the water RAN-OFF THROUGH THE DRAIN PIPE. Truly a miracle. (note: we also did this after putting the good plastic on - any adjustments should be made before spreading the gravel. Believe me.)

On top of the gravel goes soil, but FIRST, you need really thin mesh which maintains the soil above the gravel, rather than filtering through it. So mosquito netting works, but we have lots of used tunnel cloth (or whatever it's called, to protect plants from pests) so we used that.

Next is the soil, and if Javier sweated while carrying the gravel up the ladder, the soil was even heavier, especially as he decided to carry it up in feed bags.
Aquí está Javier y su cubeta odiosa (Don Miguel cribaba la tierra, yo vacia las cubetas y nivelaba la tierra). Como decia Javier al terminar, "hoy fue un día algo duro..."
This is Javier with the bucket (Don Miguel sifted the so

Sí es cierto, esta foto es fatal pero apenas tuve ganas y el tiempo para trabajar el blog así que les enseño una toma más cercano y desde arriba ya pronto (no tengo internet en el rancho). Mientras, ya llovió bien dos veces y no hay fugas, y ya empiezan a brotar plantitas. Sembré tantito pero no es necesario porque la misma tierra lleva semillas. Siquiera ya cortamos el plástico verde para que se vea tantito mejor. Y adentro se siente fresquecito, fresqueci

So I admit, the final shot is disappointing, but I'm not on the farm, and am sufficiently caffeinated to finish this and who knows when there'll be another opportunity to (and a desire to do so). I do promise however to eventually upload a shot from above, it has rained twice, the roof does NOT leak, and little planties are beginning to germinate. I seeded some buckwheat, but otherwise, the seeds in the dirt will start germinating at some point. And we did finally cut the plastic hanging down. But to sum up it's so nice and cool inside the kitchen, which was a major factor in choosing this technology.
Finalmente, le agradezco a Alejandra, más amigas y a Don Miguel y Javier por apoyarme durante mis periódos de crisis. Como dicen, asumo toda responsabilidad por errores y fallas. (pero haga esto bajo su propio riesgo, con supervisión de adultos, etc etc) PERO PERO PERO, si realmente te interesa saber más, recomiendo mucho los talleres y cursos de Alejandra en Tlaxcala, su dirección es: proyectosanisidro@hotmail.com y http://www.proyectosanisidro.com.mx/
¡suerte!
Finally, huge thanks to Alejandra, other friends and Don Miguel and Javier who supported me during my moments of crisis (and of course, all errors are mine and only mine. but if you want to build your own green roof, I'm not responsible!!! only with adult supervision, etc etc). And DEFINITELY, contact Alejandra if you're interested in taking one of her workshops in Tlaxcala proyectosanisidro@hotmail.com and http://www.proyectosanisidro.com.mx/
GOOD LUCK!!!