Patent ID: 8404331
Filing Date: 2013-03-26
Classification: B05D,E04F,Y10T

Abstract:
1. A building material comprising: a building board having a front surface, a rear surface, a top surface having a shiplap portion, a bottom surface having lap portion, and side surfaces, the side surfaces each vertically extending from the front surface to the rear surface and having no shiplap portion; a coating film formed on the front surface; and a coating film formed on the side surface, wherein the side surface is irradiated by a laser so that an upper portion of the side surface of the building hoard adjacent to the front surface is exposed in a longitudinal direction of the building board from the top surface to the bottom surface, the coating film on the side surface is located at a lower portion of the side surface adjacent to the rear surface and extends in the longitudinal direction of the building board from the top surface to the bottom surface, and a sealing material optionally disposed directly on the exposed portion of the side surface of the building board, the exposed portion of the side surface extends along a corner between the side surface and the front surface in the longitudinal direction of the building hoard from the top surface to the bottom surface and has at least 5 mm of width in the thickness direction from the front surface to the rear surface.