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2. Door - Wikipedia

   en.wikipedia.org/wiki/Door

   Core material: Material within the door used simply to fill space, provide rigidity and reduce druminess. Hollow-core – Often consists of a lattice or honeycomb made of corrugated cardboard, extruded polystyrene foam, or thin wooden slats. Can also be built with staggered wooden blocks. Hollow-core molded doors are commonly used as interior ...

3. Hollow-core slab - Wikipedia

   en.wikipedia.org/wiki/Hollow-core_slab

   Hollow-core slabs and wall elements without prestressed steel wire can be formed by extruders. The size of these elements will typically range in width from 600 to 2400 mm, in thickness from 150 to 500 mm, and can be delivered in lengths of up to 24 m. [1] The voids of the hollow core can be used as conduit for installations.

4. Voided biaxial slab - Wikipedia

   en.wikipedia.org/wiki/Voided_biaxial_slab

   Hollow-core slabs, also known as voided slabs, initially appeared as one-way elements in Europe during the 1950s, and are still commonly manufactured in precast form for applications where fast construction and low self-weight are required. [2] [6] Waffle slabs are

5. Precast concrete - Wikipedia

   en.wikipedia.org/wiki/Precast_concrete

   The interior and exterior wythes of concrete are held together (through the insulation) with some form of connecting system that is able to provide the needed structural integrity. Sandwich wall panels can be fabricated to the length and width desired, within practical limits dictated by the fabrication system, the stresses of lifting and ...

6. Safe room - Wikipedia

   en.wikipedia.org/wiki/Safe_room

   The most basic safe room is simply a closet with the hollow-core door ... Safe rooms in the basement or on a concrete slab ... Sections of either interior or exterior ...

7. Structural clay tile - Wikipedia

   en.wikipedia.org/wiki/Structural_clay_tile

   End pressure arch construction is composed of hollow tiles laid perpendicular to I beams. This method enjoyed popularity after it was discovered to be fifty percent more efficient than side pressure arches. [3] [4] Electrical wiring being installed in structural clay tile block used for interior partitions in the vertical application, 2008.