| CPC E04F 13/0898 (2013.01) [E04F 13/0846 (2013.01); E04F 13/0891 (2013.01); E04F 13/142 (2013.01)] | 13 Claims |

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1. A wall material that has a front surface and a rear surface opposite to the front surface, the wall material comprising:
a surface-side joint portion positioned in one side in a first direction of the wall material, and
a rear-side joint portion positioned in an other side in the first direction,
wherein the surface-side joint portion has:
a surface-side extension portion positioned in the front surface side of the wall material,
a first end surface formed in an end portion of the surface-side extension portion in the one side in the first direction, extended in the direction from the front surface toward the rear surface,
a first extension surface formed in the surface-side extension portion to face the rear surface, extended in the other side in the first direction, and
a first secured portion formed in the rear surface side of the wall material, positioned in a portion displaced from the first end surface in the other side in the first direction,
wherein the rear-side joint portion has:
a second end surface formed in an end portion of the wall material in the other side in the first direction, extended in the direction from the front surface toward the rear surface,
a rear-side extension portion positioned in the rear surface side of the wall material extended from the second end surface in the other side in the first direction,
a second extension surface formed in the rear-side extension portion to face the front surface, extended in the other side in the first direction, and
a second secured portion formed in an end side portion of the rear-side extension portion in the other side in the first direction,
wherein the wall material further comprises:
at least one first resin film positioned on at least one of the first end surface and the second end surface, and
at least one second resin film positioned on at least one of the first extension surface and the second extension surface,
wherein no resin film is positioned in the first secured portion and the second secured portion.
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