CC-1000_2018

CC-1000 Companion Guidance (1-2018) CC-1000 Companion Guidance CG Page of 12 Informational 9 5.7.2 Inlets under soil gas retarders in crawl spaces Air transfer openings to soil gas under the membrane must also be twice that of the cross-sectional area of the duct pipe specified for the plenum and more than a foot away from the membrane edge. 5.7.3 Whole system minimum inlet capacity The total size of all air transfer openings to the face of aggregate or soil must also be twice that of the cross-sectional area of the system exhaust pipe. 5.7.4 Inlet obstructions (perforated pipe). 5.7.4.1 Perforated pipe shall be oriented or augmented to provide unobstructed inlet openings while also providing water drainage 5.7.5 Geotextile mat products 5.7.4.1 The void space within the mat 5.7.5.2 Woven geotextile The void space within the matting represents duct piping. 5.8 Transition to exhaust vent piping 5.8.1 General 5.8.2 Air volume and pressure loss 5.8.3 Future Connections The piping connection from inlet openings to soil gas to the exhaust piping above the slab or membrane must not crimp airflow. It must retain air volume capacities required in 5.7 and not be inadvertently obstructed with debris. 5.8.4 Sump inlets not permitted 5.8.5 Collection wells or pits The open inlet for pipes that connect to soil gas are often configured within pits below a slab. However, such pits must not be designed as water control pits. 5.9 Test ports Design and install test ports where drilling diagnostic test ports after the slab is cast might not be desired, practical or even possible. 5.10 Prior to placement of concrete or soil gas retarders. 5.10.1 Secure the ducting 5.10.2 Inspect the open plenum Advisory — This is a critical point in time . If mistakes are not corrected before membranes and slabs are placed, there is no going back for repair. SECTION 6: CLOSE THE TOP OF THE PLENUM 6.1 General 6.2 Closure of concrete floors 6.3 Crawl space earthen floors 6 . 4 Materials and installation for all soil gas retarders A continuous sealed barrier is required between soil gas and the interior of the building. This process starts with preparation before casting slabs and continues with closing openings before finishings and future ongoing maintenance plans. 6.5 Inspect plenum closure prior to indoor finishings Advisory — This is another important juncture in time. If sealing is not complete, walls and floors, may not be accessible to inspect or seal. SECTION 7: PRESSURE FIELD EXTENSION EVALUATION 7.1 General 7.2 Test port locations 7.3 Test port design 7.4 The PFE evaluation These actions verify if the quality of both design and construction have achieved the capacity to control the destination of soil gas. If not, this is the time for augmenting designs with more vent pipes than initially planned.