b'CAN/CGSB-149.11-2019ACHIEVING SAFE RADON LEVELSFIGURE 3. LEVEL 2 FULL PASSIVE VERTICAL STACK (CAN/CGSB 149.11).Figure 7.2bLevel 2Full passive vertical radon stackenvelope and vents above themeasure to incorporate at the time Guide for Radon Measurements 7.2.6Radon testing devices in Public Buildings (Schools,of construction.roof is one of the acceptable approaches referenced. Hospitals, Care Facilities, Detention Centres) (HealthDesign professionals can also7.2.6.1A C-NRPP certified listed and approved long-term radon testing device and testing instructions shall be 4.2. Part 5Canada); and reference AARST/ANSI Standard provided by the builder to the homeowner at the time of occupancy. CC-1000: Soil Gas Control in Newn Part 5, the language around radon Imirrors the National Building CodeConstruction of Buildings. This stan-Radon Prevention in the Design of Canada 2020, which gives direc- and Construction of Schools anddard provided more complete guid-NOTEFor more information, please refer to Annex G. It is recommended that a long-term radon test be conducted during the tion in Clause 5.4.1.1.(1)(e) that airance in developing radon mitigation first heating season after occupancy. Other Large Buildings (EPA barrier systems shall minimize the625/R-92/016). systems for buildings outside the ingress of airborne radon and other soilscope of Part 9.7.3Level 3Full active soil depressurization systemgases from the ground with an aim to t is not clear where design profes-controlling the indoor concentrationsI 4.3.Existing Buildings & Retrofits of these gases to an acceptable level.sionals can find regional information n recent years, there has been much I7.3.1Includes level 1 and level 2 on radon levels. With the deletionfocus and discussion in the construc-Further guidance on radon barriersof Table C4, it is suggested that and other measures to reduce the radon risk map provided bytion industry related to addressing radon concentrations is provideddecarbonization of existing building 7.3.1.1The construction for a full active soil depressurization (ASD) system (Level 3) requires compliance with with the references to the BCCDC can be used to help informstock to address the climate crisis. the provisions of 7.1 (Level 1), 7.2. (Level 2), in addition to the requirements in 7.3.following documents: professionals on radon risk. WhenInterventions required to make in doubt, it is recommended that abuildings more energy efficient Radon: A Guide for Canadianpassive vent pipe is implemented at ainclude improving airtightness of theNOTELevel 3 includes the installation of an active soil depressurization system (ASD) that uses the installed piping, as Homeowners (CMHC); minimum, as this is a low-costenclosure. At the same time, there is installed in Level 2 and includes installation of a radon fan, as required in 7.3. The system relies on the radon fan to induce a pressure difference to draw radon from beneath the building and exhaust it outdoors in order to reduce indoor radon levels. An 22 BCBEC ELEMENTSA BCBEC PUBLICATIONactive system can be used to mitigate a concrete sub-slab area or a dirt crawlspace area.24CGSB 2019All rights reserved'