I finally found a place where I can buy woven polypropylene bags UV protected, but I also have access to free laminated woven polypropylene bags. My understanding is that lamination facilitates the printing process on the bags. Now, my concern is I'm afraid it greatly reduces the breathability of the bags. Am I right? If yes, should I avoid them and stick with the non-laminated ones?
I'm building a 16' X 20' earth bermed cabin which will eventually have a green roof. I intend to apply the techniques used in the building of wofati 7.0 discussed in another thread (outside walls protected by poly, umbrella, etc.).
Fill material? You want an adobe soil to dry out...
Bag size? Degradation? Gusseted? Strong? Can you poke a hoe through it? Any moldy feed residue or anything inside? These would be the criteria I'd consider.
Could be ideal or not.
You could always burn, rip off the inside layer if you use a quality fill. Could look nice if you point it.
You gonna structurally lean em slightly outwards into the berm?
The laminated bags are 18 X 30, really good shape, they have been used only once for dry cow feed. They are very rigid, maybe even too much...
If I go with the laminated bags, I think I should use very dry sand only as filling. Somehow I'm really afraid that those bags won't breath. But at the same time, to be perfectly honest, I don't know if the breathing thing is more or less crucial since it is a bermed cabin. Would good ventilation be enough in such a small structure? Moreover, if I take for granted that my umbrella and the poly sheeting will stop water and that, therefore, not much humidity will assail my bermed walls from the outside, maybe the bags can be "sealed"?
The cabin will be integrated to the side of a small hill and I was wondering if it would be a good idea to build a greenhouse with raised beds on top of the cabin. I think it might be a useful for many reasons since I live in a very cold climate.
Excavated Soil composition? Climate? Easy access to other off site fill? You have drainage addresses well?
personally, use what I scrounge, and make it work. Drier mixed fill, or I'd cut/torch the inside bag faces off and point mortar lines into it.
Also, best to Buttress/post/internal wall or round out those straight walls mid span, especially if you use sand as fill. Or spike your beams good into your bags. In retaining wall applications, aa sandbag ain't a rammed tire ya know.
Boris, my wife and I are planning a cabin similar except it will be 14 ft diameter circle with a square roof, we are also in a cold northern climate. I was wondering what you had planned for your roof? That seems to be where were getting hung up.
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