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  2. Internal Revenue Code - Wikipedia

    en.wikipedia.org/wiki/Internal_Revenue_Code

    The Internal Revenue Code of 1986 (IRC), is the domestic portion of federal statutory tax law in the United States. It is codified in statute as Title 26 of the United States Code . [ 1 ] The IRC is organized topically into subtitles and sections, covering federal income tax in the United States , payroll taxes , estate taxes , gift taxes , and ...

  3. Concrete slab - Wikipedia

    en.wikipedia.org/wiki/Concrete_slab

    Suspended slab under construction, with the formwork still in place Suspended slab formwork and rebar in place, ready for concrete pour.. A concrete slab is a common structural element of modern buildings, consisting of a flat, horizontal surface made of cast concrete.

  4. Underlayment - Wikipedia

    en.wikipedia.org/wiki/Underlayment

    Underlayment may refer to: Underlay, a material placed underneath floor carpet, other flooring materials, or mattress bedding; Underlayment, a water-resistant or waterproof layer used beneath many types of commercially available roofing material. Bituminous waterproofing, systems designed to protect residential and commercial buildings

  5. Underlay - Wikipedia

    en.wikipedia.org/wiki/Underlay

    Underlay or underlayment [1] generally refers to a layer of cushioning made of materials such as sponge rubber, foam, felt, crumb rubber, or recycled plastic; this material is laid beneath carpeting to provide comfort underfoot, to reduce wear on the carpet, and to provide insulation against sound, moisture, and heat. [2]

  6. Bituminous waterproofing - Wikipedia

    en.wikipedia.org/wiki/Bituminous_waterproofing

    The underlayment also sheds any water which penetrates the roof covering from an ordinary leak, a leak from wind-driven rain or snow, wind damage to the roof covering, or ice dams. However, the application of underlays may increase the roof temperature, which is the leading cause of ageing of asphalt shingles. Not installing an underlay may ...

  7. Gypsum concrete - Wikipedia

    en.wikipedia.org/wiki/Gypsum_concrete

    Gypsum concrete is a building material used as a floor underlayment used in wood-frame and concrete construction for fire ratings, sound reduction, radiant heating, and floor leveling. [1] It is a mixture of gypsum plaster, Portland cement , and sand .

  8. Building envelope - Wikipedia

    en.wikipedia.org/wiki/Building_envelope

    Typically residential, pitched roofs are covered with an underlayment material beneath the roof covering material as a second line of defense. Domestic roof construction may also be ventilated to help remove moisture from leakage and condensation. Walls do not get as severe water exposure as roofs but still leak water.

  9. International reply coupon - Wikipedia

    en.wikipedia.org/wiki/International_reply_coupon

    An international reply coupon (IRC) is a coupon that can be exchanged for one or more postage stamps representing the minimum postage for an unregistered priority airmail letter sent to another Universal Postal Union (UPU) member country. IRCs are accepted by all UPU member countries.