Adobe walls are load bearing, i.e. they carry their own weight into the foundation rather than by another structure, hence the adobe must have sufficient compressive strength.
ɐdˈoʊbi wˈɔːlz ɑːɹ lˈoʊd bˈɛɹɪŋ, ˈaɪ.ˈiː. ðeɪ kˈæɹi ðɛɹ ˈoʊn wˈeɪt ˌɪntʊ ðə faʊndˈeɪʃən ɹˈæðɚ ðɐn baɪ ɐnˈʌðɚ stɹˈʌktʃɚ, hˈɛns ðɪ ɐdˈoʊbi mˈʌstɐv səfˈɪʃənt kəmpɹˈɛsɪv stɹˈɛŋθ.