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  2. Pavers (flooring) - Wikipedia

    en.wikipedia.org/wiki/Pavers_(flooring)

    Concrete paver blocks laid in a circular pattern Concrete paver blocks in a rectangular pattern. A paver is a paving stone, tile, [1] brick [2] or brick-like piece of concrete commonly used as exterior flooring. They are generally placed on top of a foundation which is made of layers of compacted stone and sand.

  3. Permeable paving - Wikipedia

    en.wikipedia.org/wiki/Permeable_paving

    Wood paver blocks made of Black Locust provide a highly permeable, durable surface that will last for decades because of the characteristics of the wood. [33] Black Locust Lumber wood pavers exceed 10.180 PSI (pounds per square inch) and have a Janka Hardness 1,700 lbf. [34]

  4. Impervious surface - Wikipedia

    en.wikipedia.org/wiki/Impervious_surface

    In the contiguous 48 states of the US, urban impervious cover adds up to 43,000 square miles (110,000 km 2). Development adds 390 square miles (1,000 km 2) annually. Typically, two-thirds of the cover is pavements and one-third is building roofs. [2]

  5. Square foot - Wikipedia

    en.wikipedia.org/wiki/Square_foot

    Comparison of 1 square foot with some Imperial and metric units of area. The square foot (pl. square feet; abbreviated sq ft, sf, or ft 2; also denoted by ' 2 and ⏍) is an imperial unit and U.S. customary unit (non-SI, non-metric) of area, used mainly in the United States, Canada, the United Kingdom, Bangladesh, India, Nepal, Pakistan, Ghana, Liberia, Malaysia, Myanmar, Singapore and Hong Kong.

  6. Sett (paving) - Wikipedia

    en.wikipedia.org/wiki/Sett_(paving)

    In many cities besides Richmond and Philadelphia setts have often been used for pavement around street-running trolley or tram lines in the same manner as brickwork. Portland, Oregon , used Belgian block paving extensively in the 19th century, starting near the Willamette River, to stop the streets from washing away in floods.

  7. Vitamin D not recommended for preventing fractures in older ...

    www.aol.com/vitamin-d-not-recommended-preventing...

    The U.S. Preventive Services Task Force released a draft recommendation advising against using vitamin D to prevent falls and fractures in people over 60. Pharmacist Katy Dubinsky weighs in.

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