Long House's are made out of tree bark, reed and grass
A longhouse might start out short, but it could easily be made longer to accommodate more capacity. The walls are made out of saplings, tree bark, reeds, and grass mats.
Samplings, tree bark, reed and grass mat
They are made out of a tree bark that is flaky and sticks and grasses I hope this is the right answer for your question.
Right now in school we are learning about this subject and they are mostly mad out of saplings, treebark,and grass, and sometimes also straw
Bark, hickory, trees, and grass
Tree bark, reed. And grass
Bark ceder and buffalo hides
Redwood and cedar
Cedar and elm