A construction board includes a foam body having first and second planar surfaces, said foam body including a polyisocyanurate foam matrix defining a plurality of closed cells, said closed cells being at least substantially devoid of hydrocarbon blowing agents, and said foam body being characterized by a density, pursuant to ASTM C303, of at least 2.5 lbs/ft.sup.3; and a facer disposed on a planar surface of said foam body, said facer including a glass substrate having an internal planar surface proximate to said foam body and an external planar surface opposite said foam body, a first coating disposed on said external surface, and a second coating disposed on or proximate to said internal surface, where said first coating disposed on said external surface includes an inert filler, and where said second coating disposed on or proximate to said internal surface includes intumescent material.

A geopolymer cement and a method of producing the same are provided. A geopolymer cement binder may be provided including a geopolymer precursor and magnesium oxide as an alkali activator. The geopolymer cement binder may be mixed with water using high shear mixing.

In the present disclosure, a gypsum panel is disclosed. The gypsum panel comprises a gypsum core having a first gypsum layer surface and a second gypsum layer surface opposite the first gypsum layer surface and a fluted layer having a first fluted layer surface and a second fluted layer surface opposite the first fluted layer surface wherein the first fluted layer surface facing the first gypsum layer surface. The present disclosure is also directed to a method of forming the aforementioned gypsum panel.

Composite door systems that are configured for providing safety, security, and resistance to physical impacts or threats (natural and man-caused), and which can be utilized in barrier structures, such as for doors. The composite door systems may include one or more layers, each of which may have one or more fiber layers, such as fabric layers or plastic layers. The composite door systems may further include one or more additional layers of a sheet material, a fill material, or the like. The composite door systems are infinitely customizable and configured to be adapted to a variety of applications, and scalable levels of protection.

Provided is a panel suitable for forming a floor covering. The panel has a substantially planar top side, a substantially planar bottom side, and at least four substantially linear side edges. The linear side edges have at least one pair of opposite side edges. The linear side edges may be provided with a locking means.

Reinforced concrete structures and assemblies, building systems, and methods of fabrication.

Disclosed is a composite gypsum board comprising a board core comprising set gypsum sandwiched between face and back cover sheets. The composite gypsum board also comprises an intermediate sheet between the board core and the face cover sheet, with a thin, dense gypsum layer disposed between the intermediate sheet and the face cover sheet. Optionally, a second dense gypsum layer can be disposed between a first major side of the board core and the back cover sheet. Also disclosed is a method of preparing a composite gypsum board in which an intermediate sheet is applied over a dense gypsum layer disposed on a face cover sheet. A back cover sheet is applied to the other major side of the board core, with a second dense gypsum layer optionally disposed therebetween.

Disclosed is a method and system for blending a foam modifier with foaming agent on-line, e.g., as may be particularly useful for gypsum or cement slurries. The foam modifier comprises a fatty alcohol that is added to a gypsum or cement slurry that includes foaming agent, such as an alkyl sulfate surfactant. The fatty alcohol can be a C.sub.6-C.sub.16 fatty alcohol in some embodiments. The use of such a foam modifier can be used, for example, to stabilize the foam, reduce waste of foaming agent, improve void size control in the final product, and improve the gypsum board manufacturing process.

A trestle mat construction panel configured for use with building equipment and a method of manufacture and use thereof. The trestle mat construction panel is preferably formed of a partially hollow core body and strong support material to allow the construction panel to be easily placed and moved and to support various materials, such as construction equipment including cranes and the like, when in use.

A trestle mat construction panel configured for use with building equipment and a method of manufacture and use thereof. The trestle mat construction panel is preferably formed of a partially hollow core body and strong support material to allow the construction panel to be easily placed and moved and to support various materials, such as construction equipment including cranes and the like, when in use.