CC-1000_2018

CC-1000 Companion Guidance (1-2018) CC-1000 Companion Guidance CG Page of 12 Informational 2 CC-1000 Discussion SECTION 1: SCOPE 1.1 General 1.2 Significance of use 1.3 Applicability 1.4 Non-normative provisions 1.5 Limitations The scope of CC-1000 addresses structures that are more diverse in size and design than single family-style structures. Advisory — Larger buildings are more prone almost unpalatable expense after construction for controlling hazardous soil gas. Advisory — Radon or other hazardous soil gas can be found in any location regardless of existing surveys or maps. Optional non-normative provisions: Local jurisdictions or clients can require inspections verify effectiveness. SECTION 2: TERMS AND DEFINITONS Definitions observe air handling systems and air barriers are needed to control the migration path of soil gas. SECTION 3: REQUIREMENT SUMMARY 3.1 General 3.2 Soil gas vent systems required 3.3 Air pressure within the building 3.4 Materials and specifications Overall Design Basics Soil gas venting design must provide with no less capacity than needed to allow a fan-driven mitigation system to control the migration path of soil gas. While fans are not required during construction under CC-1000, reliance on the long history of the proven effectiveness for Active Soil Depressurization (ASD) helps ensure a cost-effective remedy when needed. Air pressures , both natural and induced by HVAC, must be accounted for. Materials and specifications must be compatible for the building while maintaining the design capacity required by CC-1000. SECTION 4: SOIL GAS COLLECTION PLENUMS 4.1 General Initial Specific Design Basics Effective venting or control for the destination of soil gas relies upon a gas permeable cavity surrounded by closed surfaces. This cavity under the building represents a return air plenum used in heating or cooling systems. Closure of outer plenum surfaces and strategic location of vent pipe air inlets are required to control the migration path of soil air. 4.2 Plenum size calculations 4.3 Vent systems per plenum size The size of each gas permeable cavity is restricted due to the limits for air volume that any single vent pipe can transport. Calculating the size of each plenum is therefore needed to design vent pipe sizes and locations. Advisory — Buildings constructed in accordance with CC-1000 will passively reduce soil gas entry. However, fans are often needed to achieve reductions to below national action levels. 4.4 Collective expanses Apply CC-1000 to the entire expanse under all slabs or membranes. Only 10% of each expanse is allowed to remain unaddressed. 4.5 Joined plenums One vent pipe system is allowed to address multiple plenum areas 4.6 Joined soil gas vent systems One exhaust pipe is allowed to vent multiple individual systems. 4.7 Limiting plenum size Limits on plenum size are sometimes needed for the safety. 4.8 Garages not required Certain ventilated garages do not require soil gas vent systems.