[CCMC 14152-R] CCMC Canadian code compliance evaluation

From: National Research Council Canada

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Code compliance opinion

It is the opinion of the Canadian Construction Materials Centre that the evaluated product, when used as a soil gas (radon) barrier in accordance with the conditions and limitations stated in this evaluation, complies with the following code:

National Building Code of Canada 2015

ID Code provision Solution type
09-13-04-02-00-0- All wall, roof and floor assemblies sepa ...Acceptable
09-25-03-06-00-0- Materials used to provide a barrier to t ...Alternative

Ontario Building Code

Ruling No. 21-01-364 (14152-R) authorizing the use of this product in Ontario, subject to the terms and conditions contained in the Ruling, was made by the Minister of Municipal Affairs and Housing on 2021-03-12 pursuant to s.29 of the Building Code Act, 1992 (see Ruling for terms and conditions). This Ruling is subject to periodic revisions and updates.

The above opinion is based on the evaluation by the CCMC of technical evidence provided by the evaluation holder, and is bound by the stated conditions and limitations. For the benefit of the user, a summary of the technical information that forms the basis of this evaluation has been included.

Product information

Product name

WALLTITE® CM01 (Radon Control)

Product description

The product is an under-slab barrier designed to restrict naturally occurring radon gas from migrating through the ground and concrete slab. It is a closed-cell, spray-applied rigid polyurethane foam of medium density, evaluated under CCMC 14100-L, and consists of two components that must be labelled as follows:

  • Isocyanate (Component A): Elastospray® 8000A isocyanate; and
  • Resin (Component B): Walltite® CM01 resin

The two components are mixed on site by BASF Canada Inc.-qualified installers (see Qualified installers section below) with fixed-ratio positive displacement equipment. The colour of the final cured product is purple.

Qualified installers and site quality assurance program (SQAP)

WALLTITE® CM01 for radon control is a site-manufactured product, whereby BASF Canada Inc. requires that only specific qualified installers be authorized to install their proprietary spray polyurethane insulation in buildings. In accordance with the BASF Canada Inc. site quality assurance program (SQAP), the certification organization (CO) Caliber Quality Solutions Inc. (Caliber) has been commissioned to license the specified installers and issue them the requisite Caliber identification card. Note that the training and installer certification to install WALLTITE® CM01 for radon control is in addition to the base Caliber/BASF Canada Inc. training for the spraying of polyurethane foam as a thermal insulation only in accordance with CAN/ULC-S705.2-05(R2016), “Thermal Insulation – Spray Applied Rigid Polyurethane Foam, Medium Density – Application”). As part of their SQAP, BASF Canada Inc. also stipulates site audit inspections be conducted by site inspectors licensed by Caliber. Upon completion of the site audit, Caliber will report the product’s conformity results and any corrective action required, if necessary, to BASF Canada Inc. Building officials who would like site-audit inspections to be conducted on specific building sites can contact Caliber (see details in CCMC 14100-L).

All specified installers must present a Caliber identification card to the building official that indicates the installer is certified to install the spray foam for both intended functions; that is, as a thermal insulation (CAN/ULC-S705.2-05(R2016)) and as an air/radon barrier.

Thickness – spray foam and gravel drainage layer

The WALLTITE® CM01 for radon control requires a minimum of 50-mm spray polyurethane to be installed. The spray polyurethane may be sprayed directly over the NBC-specified 100-mm gravel bed or onto a geotextile. When applied directly over the gravel bed, the foam resin may penetrate up to 15 mm into the cavities between the surface gravel. For direct gravel applications, the gravel bed shall be increased to 115 mm to ensure a minimum 100-mm gravel bed as the gas-permeable layer to evacuate the radon gas.

Radon resistance

It should be noted that Sentence of Division B of the NBC 2015 requires an effective air barrier system be installed as a barrier to soil gas. WALLTITE® CM01 has been evaluated beyond the qualification as an air barrier system required by the NBC 2015 for soil gas, as outlined in the "Other technical evidence" section of this Report, as WALLTITE® CM01 has qualified as an effective barrier to, specifically, radioactive radon. WALLTITE® CM01, when installed at 50 mm, shows better resistance to radon than 6-mil polyethylene (that is, the NBC 2015 benchmark acceptable solution).

Manufacturing plants

This evaluation is limited to products produced at the following plants:

Product nameManufacturing plants
Blackie, AB, CAToronto, ON, CA
WALLTITE® CM01 (Radon Control)Product evaluated by the CCMCProduct evaluated by the CCMC

Product evaluated by the CCMC Indicates that the product from this manufacturing facility has been evaluated by the CCMC

  Conditions and limitations

The CCMC’s compliance opinion is bound by this product being used in accordance with the conditions and limitations set out below.

  • The system must be applied on site by qualified installers who are BASF-trained and Caliber-certified and who possess a Caliber identification card.(1) The SQAP and installation manual shall be available on site for review by the local authority having jurisdiction (AHJ).
  • The thickness of the specified medium-density spray polyurethane foam shall be a minimum of 50 mm when installed over geotextile. When sprayed directly onto the gravel, the NBC-specified 100-mm gravel bed shall be increased to 115 mm. Per Sentence, Required Installation of Granular Material, of Division B of the NBC 2015, the specified gravel shall consist of coarse, clean granular material containing not more than 10% of material that will pass a 4 mm sieve.
  • A minimum of 24 hours shall pass before the installation of the 100-mm concrete floor slab.
  • As with the 6-mil polyethylene sheet, care shall be taken to not damage the spray polyurethane surface during the installation of the concrete slab; in particular, damage from any reinforcement mesh.
  • WALLTITE® CM01 has shown ability to seal around penetrations of 100-mm ABS, PVC and steel pipes, and 6.35 mm copper pipes, without need for sealant. Other materials may require additional sealant (that is, polyethylene pipes).


Figure 1. Application of WALLTITE® CM01 for radon control beneath concrete slab, with geotextile/100 mm gravel or without geotextile/115 gravel bed.

  1. Exterior wall damp proofing
  2. Flexibile sealant (as per NBC)
  4. 100 mm granular fill with geotextile, or 115 mm granular fill
  5. WALLTITE® CM01 as a thermal break


Figure 2. Application of WALLTITE® CM01 for radon control beneath concrete slab, with geotextile/100 mm gravel or without geotextile/115 gravel bed.

  1. Exterior wall damp proofing
  3. 100 mm granular fill with geotextile, or 115 mm granular fill

  Technical information

This evaluation is based on demonstrated conformance with the following criteria:

Evaluation requirements
Criteria number Criteria name
CCMC-TG-072623.01-15CCMC Technical Guide for Medium Density (MD) Spray Polyurethane Foam Insulation (SPUF) for Soil Gas (Radon) Control beneath Concrete Slabs-on-Ground

The Report Holder has submitted technical documentation for CCMC’s evaluation. Testing was conducted at laboratories recognized by CCMC. The corresponding technical evidence for this product is summarized below.

Performance requirementsThe following were the key performance requirements for the evaluation:
  1. Material qualification: Medium-density spray polyurethane foam (SPUF) complying with CAN/ULC-S705.1, and installation as per CAN/ULC-S705.2. Confirmed through possession of active CCMC Listing;
  2. Air barrier system: The air barrier system for floors-on-ground qualification through testing. The NBC 2015 benchmark is 6-mil polyethylene as per Sentence of Division B of the NBC 2015;
  3. Soil gas barrier: The barrier performance against soil gas, specifically radon, based on qualification testing, small-scale and large-scale. The NBC 2015 benchmark is 6-mil polyethylene as per Sentence of Division B of the NBC 2015, referring to Sentence;
  4. Resistance to mechanical damage: Repeat small-scale radon-barrier testing with indented SPUF by simulated concrete pour/workman load damage.
  5. Dampproofing: The dampproofing function as a requirement for the SPUF beneath the slab is optional, as dampproofing is waived when 100 mm of coarse, clean granular material is installed beneath the slab as per Clause, Required Damproofing, of Division B of the NBC 2015. See the Other technical evidence (optional testing) section.
Table 1. Material qualification
SPUF product CAN/ULC-S705.1 compliance Thermal insulation in field (CAN/ULC-S705.2) site quality assurance program (SQAP) Radon barrier in field WALLTITE® CM01 site quality assurance program (SQAP)
CCMC 14100-L (WALLTITE® CM01) BASF-trained and Caliber-certified installers BASF-trained and Caliber-certified installers
Table 2. Air barrier system performance
Material Test procedure Unit Requirement Result
SPUF product CCMC 14100-L sealing around pipe penetrationsTable footnote (1) ASTM D 2178/D 2178M-13Table footnote (1) L/(s∙m2 ) 0.02Table footnote (2) 0.0074 – 0.0099Table footnote (3)
6-mil polyethylene NBC 2015 Table A- footnote (1) L/(s∙m2 ) NBC-acceptable solution benchmark negligible
Table 3. Radon barrier performance for BASF SPUF product CCMC 14100-L at 50-mm thickness
Property Unit RequirementTable footnote (1) Result
Small-scale tests
Radon diffusion coefficient (D)Table footnote (2) m2 /s < 8.05 × 10-12 m2/s
6-mil polyethylene NBC benchmark
negligibleTable footnote (3)
Radon resistance (Rradon)Table footnote (4) s/m ≥ 1.90 × 107 s/m
6-mil polyethylene NBC benchmark
Table footnote (3)Table footnote
Radon diffusion coefficient (D) after mechanical damage m2 /s < 8.05 × 10-12 m2/s
6-mil polyethylene NBC benchmark
1.59 × 10-10Table footnote (5)
Radon resistance (Rradon) after mechanical damage s/m ≥ 1.90 × 107 s/m
6-mil polyethylene NBC benchmark
8.48 × 109
Large-scale tests
Radon infiltration (BASF WALLTITE® CM01 and floor assembly) % < 6.6 % (RnR/RnD)Table footnote (6)
6-mil polyethylene NBC benchmark


Other technical evidence  

Additional performance data requested by the Report Holder

Data in this section does not form part of CCMC's opinion in the code compliance opinion section.

Dampproofing (optional)

Table 4. Dampproofing performance of SPUFTable footnote footnote (1)
Property Unit Test procedure Requirement Result
Coefficient of water absorption @ 24-h Table footnote footnote (1) kg/(m2 ·s1/2) ISO 15148:2002 < 0.0040 0.0002
Water vapour permeance ng/(Pa·s·m2 ) ASTM E 96/E 96M, Procedure B (wet cup method)  ≤ 43 46.08Table footnote footnote (2)Table footnote footnote (3)


NRC Construction Research Centre Radon Testing Facilities

(1) Small-scale Tests Radon Diffusion Test Chamber (RDTC)

Schematic of Radon Diffusion Test Chamber
Figure 3. Schematic of RDTC
  1. Receiving compartment
  2. Radon monitor
  3. Test sample
  4. Dosing compartment
  5. Radon source

(2) Large-scale Tests Radon Infiltration Building Envelope Test Systems (RIBETS)

Conceptual design of the Radon Infiltration Building Envelope Test Systems
Figure 4. Conceptual design of the RIBETS
  1. Sub-slab radon (Rn) exhaust stack (100 mm PVC pipe)
  2. Make-up air stack
  3. Exhaust stack
  4. Control damper
  5. In-line fan
  6. Baseboard heater
  7. Radon source
  8. Dosing compartment
  9. Receiving compartment
  10. Concrete pad
  11. Perforated stainless steel plate
  12. Gravel (100 mm), specification as per NBC 2015
  13. Air barrier (6-mil polyethylene or spray foam products)
  14. Concrete slab (101.6 mm)
  15. Copper tubing for pressure measurement

Administrative information

Use of Canadian Construction Materials Centre (CCMC) assessments

This assessment must be read in the context of the entire CCMC Registry of Product Assessments, any applicable building code or by-law requirements, and/or any other regulatory requirements (for example, the Canada Consumer Product Safety Act, the Canadian Environmental Protection Act, etc.).

It is the responsibility of the user to confirm that the assessment they are using is current and has not been withdrawn or superseded by a later version on the CCMC Registry of Product Assessments.


The National Research Council of Canada (NRC) has evaluated only the characteristics of the specific product described herein. The information and opinions in this evaluation are directed to those who have the appropriate degree of experience to use and apply its contents (such as authorities having jurisdiction, design professionals and specifiers). This evaluation is valid when the product is used as part of permitted construction, respecting all conditions and limitations stated in the evaluation, and in accordance with applicable building codes and by-laws.

This evaluation is provided without representation, warranty or guarantee of any kind, expressed or implied, and the NRC provides no endorsement for any evaluated product. The NRC accepts no responsibility whatsoever arising in any way from any and all use of or reliance on the information contained herein or the use of any evaluated product. The NRC is not undertaking to render professional or other services on behalf of any person or entity nor to perform any duty owed by any person or entity to another person or entity.


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© His Majesty the King in Right of Canada, as represented by the National Research Council of Canada, 2023

All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording or otherwise, without the prior written permission of the CCMC.

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