"The Hate U Give is a 2017 young adult novel by Angie Thomas. It is Thomas's debut novel, expanded from a short story she wrote in college in reaction to the police shooting of Oscar Grant." ~google
His own scientific investigations
They consisted of clay (to be exact hayclay or mud bricks), reeds, thick timber posts and stone for the walls(and foundation). As for the roof; tree trunks, reeds, clay and hay.