Patent ID: 6786804
Filing Date: 2004-09-07
Classification: E04F

Abstract:
A method for manufacturing a siding board for clapboard boarding that is employed in a clapboard boarding structure in which a plurality of siding boards are installed to a framework of a building such that lower side portions of upper siding boards are overlapped frontward of upper side portions of lower siding boards, the method comprising the steps of:embossing a green sheet to make an embossed board prior to curing of cement for forming joint concave portions at portions that are to be vertical joint grooves of the siding boards and for forming lower concave portions below portions that are to be lower edges of the siding boards, in which the lower concave portions have different vertical widths with boundaries of the joint concave portions; curing the cement of the embossed board; and grinding down the lower side portions of the embossed board horizontally across the embossed boards from a rear surface side thereof up to a bottom surface of the lower concave portions to form rear surface stepped portions and to form lower side portions of the siding board having lower edges at different heights with boundaries of the vertical joint grooves.