To obtain a wall underlayer material of a wooden fibrous board type having a high wall bearing force, which does not cause the decrease in the humidity adjusting capability and heat insulation property that are characteristic of the wooden fibrous board and which, as a result, does not bring about the bedewing in the wall inside, using an economically excellent method, and to obtain its manufacturing process.
The wall underlayer material is obtained by providing the strip-like reinforcing boards, which consist of wooden fibrous boards having a density of 0.40-0.80 g/cm3, at least for the marginal longitudinal portions of the rear surface side of the substrate, which consists of a wooden fibrous board having a density of 0.30-0.40 g/cm3, so that the strip-like reinforcing boards become flush with the rear surface of the substrate.
ISHII MASAMITSU
OSHIMA KATSUTO
IRIYAMA TOMOYUKI
MIURA MASAHIRO
