On placing the first wooden pillars for a house a sacrifice is made to the house-spirit. When all supporting pillars are erected the bamboo beams and joists are attached. A bamboo framework is then made for the sleeping-place. Subsequently the two ridge pillars are erected and the ridge pole laid across. The rafters and the purlins are fixed on to the roof framework which is then covered with grass mats. The ridge consists of two beams between which sharpened bamboo stakes are pierces in order to fix the grass mats on to the ridge. The ridge is adorned with turrets fixed on top of the smoke-openings. The door is set after the walls, made of plaited bamboos, are set in.