Old longhouses in Asia were made of tree trunks as structure members, long leaves as the roof cover, split bamboo or small tree trunks as the flooring and tree bark as the wall coverings. In the past, longhouses were primarily made out of wood like that from the eusideroxylon zwageri tree (Bornean Ironwood) so the longhouses were able to stand firm and durable. In modern times many of the older longhouses have been replaced with buildings using more modern materials, like brick or cement, but of similar design.