CC-1000_2018

Soil Gas Control Systems ANSI/AARST CC-1000 2018 in New Construction of Buildings 14 7.3 Test port design Test ports required for evaluating PFE and/or soil gas concentrations are most commonly created by drilling 1/4- to 1-inch (6 mm to 2.5 cm) diameter holes through the slab with care to vacuum debris from each hole to achieve unobstructed air transfer of soil gas. The test ports shall be: a) closed at the top during and after construction but reasonably accessible for future measurements without destructive or significant disassembly of building components or finishes; b) installed in a safe manner so as not to present hazards to future occupants; and c) prominently documented in as-built diagrams. 7.3.1 Preinstalled test port design Each port opening above the slab shall be in an accessible location in accordance with Section 5.9 and either: a) replicate a vertically drilled 1/4- to 1-inch (6 mm to 2.5 cm) diameter hole through the slab; or b) connect with tubing that is 1/4- to 1-inch (6 mm to 2.5 cm) inner diameter (ID) to a remotely located port opening within the gas permeable layer(s). 7.3.1.1 Open ends of the port tubing within the gas permeable layer(s) shall be inserted into a constructed void space in a manner that achieves an unobstructed inlet for air transfer that will not be compromised during construction. For example, 1/2- inch (1.3 cm) ID tubing should be inserted into a constructed void space not less than 1 pint (0.5 L) in size or into perforated pipe not less than 1 foot (30 cm) in length for equivalent air transfer capacity. 7.3.1.2 Port tubing shall extend from the port inlet(s) to above a slab or membrane in accordance with Section 5.8.3 and result in being unobstructed with durable qualities associated with tubing in conduit. The tubing shall be resistant to rust degradation and if chemical contaminates are known to be in the soil, an environmental engineer shall be consulted for choosing products that are resistant to chemical degradation. 7.4 The PFE evaluation The pressure measurements shall be recorded and compared for evidence of: a) Poor effectiveness (i.e., unexpectedly low vacuum at all test ports associated with the same exhaust vent pipe ); and b) Inconsistencies (i.e., unexpected differences between vacuum at one test port compared to another test port that is associated with the same exhaust vent pipe .) If poor effectiveness or inconsistency is indicated, a qualified professional shall conduct an investigation to identify unclosed openings in the soil gas collection plenums(s) and any changes that may be needed for number and locations of soil gas inlets and exhaust vent pipes . SECTION 8: SOIL GAS EXHAUST VENT PIPE 8.1 General Exhaust vent pipes (i.e., vent pipe, riser pipe, primary trunk or ma in trunk ) shall be sized and conf igured to comply with Sections 4.2 , 4.3 , 5.6 an d 5.8 . 8.2 Slope Exhaust vent piping shall have a slope of not less than 1/8 inch per foot (3.2 mm per 30 cm) that slopes downward towards the soil. Sloped sections of horizontal pipe in excess of nominally 15 feet (5 m) shall be avoided to the extent practicable. When the required slope or drainage cannot be achieved, other methods for draining collected water shall be provided. 8.3 Prevention from air and water leakage All exhaust vent piping, except the intake and exhaust locations, shall result in an air and water tight duct system. 8.3.1 Conditioned Space Exhaust vent piping that extends between the location designated for an ASD fan and the point of exhaust outside the building shall not be installed in, or pass through or under, the conditioned space of the building. 8.4 Pipe routing and thermal optimization 8.4.1 Routing duct pipe within the building When ASD fans are not installed concurrently with the soil gas vent system , exhaust vents : a) shall not adjoin exterior building walls or traverse other locations, except attics, where the piping is exposed to temperatures that can be colder than indoor air, and b) shall be provided with insulation that has an R- value of no less than 4 or greater where exhaust piping extends through attics or other areas that are outside the heated and cooled envelope of the building. 8.4.2 Insulation required As required by codes or climate conditions, duct piping shall be provided with insulation. 8.4.2.1 Where it is likely on a regular basis (e.g., annually or every few years) that freezing temperatures will result in ice buildup within duct piping that would adversely affect long-term system performance, duct piping shall be provided with insulation that is protected from the elements and has an R-value of no less than 4 or greater depending upon climate extremes.