[Strawbale] Tire footing

[JUAN MANUEL SUAREZ RIVAS]

Hello

I bought and read the Book of Rikki, documentándome with everything I see
the net, but still I have doubts that I hope can help please

If I make two rows of tires filled with gravel to build
Nebraska plant system with hipped roof is it necessary to
some kind of foundation or enough with the tires?

If in the future extend the roof to get up another plant with the same
system still valid the plinth tire?

The house is 5 x 5 meters inside, 6 x 6 exterior.

Thank you very much for your help.
Juan Manuel
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