Home Fire Safety – Home Elevator Design, Fire Safety Guidelines A home elevator shaft, or hoistway shall be framed with lightweight, or cold-formed, steel – not wood, where exterior surfaces are available for wallboard application, exterior walls. It shall be finished with not less than 1 layer-5/8” Type-X gypsum wallboard glued, screwed and taped and shall be mudded not less than 3 coats, paying particular attention to screw pocks which shall be taped, too.
This article is about a unique approach to custom home design involving fire safety for a home elevator.
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Decreases the toxic effect of NaCl salinity: Calcium from gypsum has a physiological role in inhibiting the uptake of sodium by plants. Thus plant are mitigate the sodium toxicity, which is more pronounced in the salt affected soils.
Gypsum is chemically calcium sulfate dihydrate (CaSO4.2H2O). When dissolved in water, it yields calcium ions (Ca2+) and sulfate-sulfur ions (SO42-). Both of these ions are essential major nutrients for growing plants. In addition to this, calcium also plays a vital role in establishing and maintaining good chemical balance in soil, water and plants. Gypsum is one of those rare materials that perform in all three categories of soil treatment: an amendment, conditioner, and fertilizer. The usage of gypsum in agriculture can be grouped into following heads:
Some gypsum plaster systems can be applied directly to drywall with the use of bonding agents. This type of plaster, known as ”veneer plaster”, is typically applied in one thin coat. Gypsum veneer plaster is fast and usually less expensive than traditional gypsum plaster. When applying a veneer plaster, all joints in the drywall must be prepared with joint compound or with the manufacturer’s recommended joint treatment materials. Once the joints are treated, a bonding agent is required. This is a water based PVA (polyvinyl acetate) or an acrylic bonding agent. PVA bonding agents are for interior use only because they re-emulsify when they get wet. PVA bonding agents are the most popular because they can be dry before the plaster coat is applied (as opposed to an acrylic bonding agent, which must still be wet when the plaster is applied, forcing the applicator to rush the process). A controlled environment is also important when applying a gypsum veneer finish, although some veneers are modified with acrylics, cement and chemicals, providing a better bond, higher compressive and tensile strengths, crack resistance, color retention and crack resistance. These modifications may make the product easier to work with and will give the applicator more flexibility. Once the finish coat is dry and completed, it should be sealed with a water based sealer.
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