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Oldcastle Materials Inc. is a supplier of asphalt, concrete, and other building materials, and also offers construction and paving services. The Atlanta-based company is a subsidiary of CRH plc, a publicly traded international group of diversified building materials businesses, [2] [3] and has approximately 18,000 employees at 1,200 locations, as of March 2018.
CRH entered the United States in 1978 by buying Amcor, a concrete products group in Utah which would then form the basis of the company's U.S. division, which is now called Oldcastle Inc. Subsequent large purchases in the US included Callanan Industries, a New York State based aggregates and asphalt producer in 1985.
Oldcastle glass was created through the merging of multiple glass manufacturers, including Hordis Brothers (marketed as "Arm-R-Clad"), HGP Industries, [1] United Tempering Systems, North American Glass, O&W Glass, Downey Glass, Glass Distributors of America, General Glass, Tempglass, Armourguard Glass Products, Wescan Glass Industries, Free State Glass Industries, and Oldcastle Specialty Glass.
Precast concrete is a construction product produced by casting concrete in a reusable mold or "form" which is then cured in a controlled environment, transported to the construction site and maneuvered into place; examples include precast beams, and wall panels, floors, roofs, and piles.
Studcast walls are prefabricated, ready-to-erect, high-performance concrete walls that weigh half as much as standard concrete walls. A hybrid between architectural precast concrete and panelized light-gage cold-formed steel framing, studcast walls combine the best features of each material in a way nullifies each material's weaknesses.
The precast concrete slab has tubular voids extending the full length of the slab, typically with a diameter equal to the 2/3–3/4 the thickness of the slab. This makes the slab much lighter than a massive solid concrete floor slab of equal thickness or strength. The reduced weight also lowers material and transportation costs.
Construction materials commonly used include wood pilings, commercially developed vinyl products, large boulders stacked to form a wall, or a seawall built of concrete or another hard substance. Coastal property owners typically seek to develop bulkheads in an attempt to slow large landslide erosion caused by wave action.
Headwall and corrie lake Cwm Idwal. In physical geography and geology, the headwall of a glacial cirque is its highest cliff.The term has been more broadly used to describe similar geomorphic features of non-glacial origin consisting of a concave depression with convergent slopes typically of 65 percent or greater forming the upper end of a drainage valley.