A panel comprises a board having a front face and a back face. The back face has a first edge and a second edge that is aligned with the first edge. A first set of tabs and a second set of tabs are attached to the back face, the first set of tabs being positioned along the first edge of the back face and the second set of tabs being positioned along the second edge of the back face, each individual tab being oriented transversely to the respective edge and protruding from the respective edge. The positions of the individual tabs on the first edge of the back face are offset from the positions of the individual tabs on the second edge of the back face.

A building face material with printed indications is provided, where, even when any part of the building face material is cut in a cutting process in a manufacturing process, each first printed indication is marked at an allowable distance from an end side of the building face material that is rectangular in a plan view, and printed indications are preliminarily marked at predetermined intervals, in a given column.

The building face material 10 with printed indications includes printed indication strings each including one string group that is repeated in cycles, the string group being formed, in a plan view, on a rectangular flat face of the building face material, and the strip group consisting of multiple printed indications that are arranged, at regular first intervals, in a predetermined order along at least one straight line driven to a first side 11 or a second side 12 of a rectangle.

The invention relates to a fibrous mat facer for preparing a gypsum board, to a gypsum board comprising said mat facer and to a system comprising said gypsum board. The fibrous mat comprises at least one ply of a non-woven fabric, and a binder composition, wherein the binder composition represents from 10 to 40 wt % of the total weight of the mat. The binder composition comprises a copolymer comprising a co-monomer unit of a vinyl ester of an alpha branched aliphatic monocarboxylic acid, said copolymer being present in an amount from 25 to 100 wt % of the binder composition weight.

A partition for a building structure comprises a support frame and a plasterboard affixed to the support frame. The support frame comprises a plurality of elongate timber members. The plasterboard comprises a gypsum matrix having fibres embedded therein in an amount of at least 1 wt % relative to the gypsum, as well as a polymeric additive that is present in an amount of at least 1 wt % relative to the gypsum.

A partition for a building structure comprises a support frame and a plasterboard affixed to the support frame with a plurality of screws. The plasterboard comprises a gypsum matrix having fibres embedded therein in an amount of at least 1 wt % relative to the gypsum, as well as a polymeric additive that is present in an amount of at least 1 wt % relative to the gypsum. The support frame comprises a plurality of elongate timber members and the average spacing between nearest-neighbour screws is greater than 400 mm.

A plasterboard comprises a gypsum matrix having a polymeric additive distributed therein in an amount of at least 1 wt % relative to the gypsum, the gypsum matrix further having a first group of fibres and a second group of fibres embedded therein, wherein the fibres of the first group of fibres have an average length that is at least three times the average length of the fibres of the second group of fibres.

Composite gypsum panels and methods of making thereof are provided. The composite gypsum panels can include one or more gypsum panel substrates having one or more urethane layers applied thereto. The urethane layers can be or can include foamed urethane layers, provided for structural integrity while being lighter than conventional gypsum panels having the same overall thickness. The panel can have a dense coating layer, a foamed coating layer, or both a dense coating layer and a foamed coating layer. The dense coating layers and foamed coating layers can each offer certain advantages over conventional gypsum panels. Additionally, in various aspects, the composite panel includes a water-resistant barrier and increased nail and screw retention.

In one aspect, a gypsum panel includes a gypsum core, a fiberglass mat, and a wetting agent deposited across an entire thickness of the fiberglass mat. The wetting agent is deposited onto the first fiberglass mat in an uncoated state of the fiberglass mat such that the wetting agent penetrates the entire thickness of the fiberglass mat.

A building board including a cementitious layer between two fiber mats. At least one fiber mat forms with a polymer film a fiber mat/polymer film laminate. The cementitious layer of the building board contains a reactive water-insoluble polymer which improves binding of the fiber mat/polymer film laminate to the cementitious layer. The building board has a low water absorption and a high level surface finish.

Provided are wallboards in which gypsum core is adhered to a paper cover sheet with an adhesive. Wallboards with laminated paper cover sheets in which an inner water-absorbent cover sheet is adhered to the outer paper cover sheet are provided as well. Methods for making these wallboards are provided as well.