9B-52.004 Florida Standard for Passive Radon-Resistant New Residential Building Construction, Adopted
|THREE||CONSTRUCTION REQUIREMENTS FOR PASSIVE RADON CONTROL|
|302 Sub-slab and Soil Membranes||806|
|303 Floor Slab-on-grade Buildings||807|
|304 Slab-below-grade Construction||809|
|305 Buildings with Crawl Spaces||809|
|306 Buildings with Combination Floor Systems||809|
|307 Space Conditioning Systems||809|
Exempt buildings are as follows:
CAULKS AND SEALANTS. Those materials which will significantly reduce the flow of gases through small openings in the building shell. Among those used are:
Urethane. A crystalline ester-amide used as a gelatinizing agent for cellulose acetate or cellulose nitrate. A component of polyurethane used in making flexible and rigid foams, elastomers, and resins for coatings and adhesives.
Epoxy. A thermosetting resin characterized by adhesiveness, flexibility and resistance to chemicals and used chiefly as a coating or adhesive.
Polysulfide rubber. A synthetic rubber characterized by impermeability to gases and used in adhesives, binders and sealing compositions and in coatings.
CONDITIONED FLOOR AREA. The horizontal projection (outside measurements) of that portion of space which is conditioned directly or indirectly by an energy-using system.
CONDITIONED SPACE. All spaces which are provided with heated and/or cooled air or which are maintained at temperatures over 50°F (10°C) during the heating season, including adjacent connected spaces separated by an uninsulated component (e.g., basements, utility rooms, garages, corridors).
CONTRACTION JOINT. A formed, sawed, or tooled groove in a concrete slab to create a weakened plane and control the location of cracking resulting from drying and thermal shrinkage (also sometimes called control joint).
CRAWL SPACE. The unconditioned space between the lowest structural member of the floor and the earth. The crawl space is created when the floor spans between structural supports rather than being directly supported by the earth beneath the floor.
HVAC. Heating, ventilating and air conditioning.
INFILTRATION BARRIER. A product or system designed to limit the free passage of air through a building envelope component (wall, ceiling or floor). Such products and systems may be continuous or noncontinuous discrete elements which are sealed together to form a continuous barrier against air infiltration.
MANUFACTURED SANDS. Sands resulting from the crushing of rock, gravel or slag.
MITIGATE. Make less severe, reduce, relieve.
NATURAL SANDS. Sands resulting from the natural disintegration and abrasion of rock.
OCCUPANCY. The purpose for which a building or part thereof is used or intended to be used. For the purposes of determining changes of occupancy for this code, the occupancy shall be considered the major occupancy group designations established by the locally adopted building code.
OUTSIDE AIR. Air taken from the outdoors and, therefore, not previously circulated through the system.
PASSIVE RADON PROTECTION SYSTEM. Indoor radon reducing building design, material, or construction features that increase the barriers to radon entry and require no mechanical operation, operating costs, or user attention beyond normal home maintenance (such as recaulking floor cracks, etc.).
PICOCURIE (pCi). A unit of measurement of radioactivity. A curie is the amount of any radionuclide that undergoes exactly 3.7 × 1010 radioactive disintegrations per second. A picocurie is one trillionth (10-12) of a curie, or 0.037 disintegrations per second.
PlCOCURIE PER LITER (pCi/L). A common unit of measurement of the concentration of radioactivity in a gas. A picocurie per liter corresponds to 0.037 radioactive disintegrations per second in every liter of air.
RADON. A naturally occurring, chemically inert, radioactive gas. It is part of the Uranium-238 decay series. For the purposes of this standard, radon applies to Radon-222; thus, it is the direct decay product of Radium-226.
RESIDENTIAL BUILDING. A residential occupancies which includes single-family and multiple-family buildings that are three or fewer stories above grade. Hotels, motels and other transient occupancies are considered nonresidential buildings for the purpose of this standard.
SOIL GAS. Gas which is always present underground, in the small spaces between particles of the soil or in crevices of rock. Major constituents of soil gas include air and water vapor. Since Radium-226 is essentially always present in the soil or rock, trace levels of Radon-222 also will exist in the soil gas.
SUBSTRUCTURE MEMBRANE. Flexible, nondegrading material sheet placed between the soil and the building for the purpose of reducing the flow of soil gas and moisture into the building. Examples are: polyethylene, ethylenepropylene diene terpolymer (EPDM), neoprene, and cross laminated HDPE.
VENTILATION. The process of supplying or removing air, by natural or mechanical means, to or from any space. Such air may or may not have been conditioned.
Slabs and foundations shall be constructed using a slab edge detail that eliminates cracks that could connect the house interior to subslab soil and is consistent with other construction constraints such as terrain. Monolithic slab construction should be used where possible. Only the following slab edge detail options may be used:
Exception: Slab-edge vertical joints occurring in slab poured into stem wall construction [see Section B303.2(2)]. The sealant (see Section B303.6) shall be applied according to the manufacturer's instructions. (Note: most sealants require the concrete to be cured and dried.)
Plastic pipes shall be in contact with the slab along the slab's depth by casting the concrete tightly against the pipe. Where pipes are jacketed by sleeves they shall be sealed by one of the following methods:
Mix designs for all concrete used in the construction of slab-on-grade floors shall specify a minimum design strength of 3,000 psi (20.7 MPa) at 28 days and a design slump not to exceed 4 inches (102 mm). On-site slumps shall not exceed 5 inches (127 mm), provided total water added to the mix including plant, transit and site added water does not exceed the following parameters:
Slabs shall have a sub-slab membrane, conforming with Section B302 that extends to the slab perimeter, but does not vertically separate the slab from the foundation wall. The slab and membrane shall be placed in accordance with Section B303, or may use a floating slab design with all of the following conditions: