Gypsum lay-in ceiling panels should not be used in areas that are directly exposed to water. They should also not be used in swimming pools, shower dressing rooms and in areas with high humidity or moisture. Backload should be limited to 0.5 pounds per square foot. Enclosed or unheated spaces above the ceiling panels should be properly ventilated. Retainers or hold down clips must be provided in installations where sudden wind or air pressure change may uplift the panels. Use only an approved suspended system for exterior use when being installed outdoors.
Decreases pH of sodic soils: The sodic soils are characterised by the high soil pH (>8.5). Gypsum lowers the high pH of sodic soils or near sodic soils to 7.5 to 7.8. These values are in the range of acceptability for growth of most crop plants. Increased calcium uptake by roots when gypsum is applied can decrease the pH of the rhizosphere.
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The Environmental Protection Agency (EPA), Superfund program considers the amount of radon gas entering homes and buildings from reclaimed phosphate mine lands. Its decisions regarding whether to remediate man-made radioactive contamination sites are usually driven primarily by how much of the radioactive metals are present, in this case, a reclaimed Florida phosphate strip mine.
A home elevator design inherently includes a shaft, or hoistway, that could make a swell chimney, and double the peril by holding within the cab those who could be the most physically vulnerable folks in the house.
Gypsum is a substance used to help clear the chemical component of muddy waters. It is a mineral found in drywall, plaster, and fertilizers. It is pH neutral, which is important as pH is one of the factors that must be kept at the right level for the health of a lake. Gypsum works by clumping particles of clay together which then sink to the bottom as the clumps get heavier in weight.
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