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They are calculated using the standards set forth in astm e1155 which is the standard test method for determining f f floor flatness and f l floor levelness numbers.
Elevated concrete floor code. Presented by douglas sarkkinen principal otak incorporated battle ground wa 2015 aci fall convention denver co. When you have a vertical wood post or column resting on concrete or another masonry and that concrete masonry itself rests directly on the earth then the post column must be pressure treated. Raised access floors mount concrete panels on metal posts. Occasionally however project specifications.
Aci 318 building code requirements for structural concrete ansi asce 3 standard for the structural design of composite slabs and sdi 30 design manual for composite decks form decks and roof decks do not require the use of contrac tion joints for elevated structural slabs. Refer to aci 223 for procedures for the design and construction of shrinkage compensating concrete slabs on ground. The american concrete institute indicates acceptable ranges for flatness and levelness in aci 302 1 guide for concrete floor and slab construction. Place and either building an elevated floor within the house or adding a new upper story.
Architectural specifications will identify the acceptable ff and fl numbers for the project so architects must understand the limitations of concrete slab installation. Contractor and engineer responsibilities an out of level elevated slab may be caused by. The slab has to be at least 3 5 thick and possibly thicker for expansive or other difficult soils. Effects of concrete placing and fin ishing operations on floor flatness will be discussed in a subsequent a rt i c l e.
During the elevation process most frame masonry veneer and masonry houses are separated from their foundations raised on hydraulic jacks and held by temporary supports while a new or extended foundation is constructed below. Concrete floor and slab construction 302 1r 3 the design of slabs on ground should conform to the recommendations of aci 360r. Because heights of these floors can range from 6 inches to nearly two feet echoes from footfall are heard every step of the way. The design of suspended floors should conform to requirements of aci 318 and aci 421 1r.
Concrete and another masonry unless treated or otherwise coated is highly porous. Water can pass through porous materials vertically via capillary action. The international residential code irc lays out a series of requirements for pouring a concrete slab on grade.
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