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Ideally verifying multiple lifts during spray foam application would be a good idea to ensure proper adhesion and to check for air pockets but the CEC has left that out when complying with QII. The Rater will need to check for surface contact and that it meets the minimum depths if used as an air barrier and overall R-value thickness (see RA18.104.22.168.1 for ccSPF or RA22.214.171.124.2 for ocSPF referenced in the CalCERTS QII Handbook at the link below).
The CEC does specify SPF with multiple layers applied, each foam lift (i.e. spray application) adheres to the substrate and foam interfaces. But they do not specify how this needs to be accomplished. Having to witness each lift would require lots of extra time and coordination with the installers. The Rater would also need safety equipment (respirator, body suite, etc.).
- The installer shall determine and the HERS Rater shall verify that the manufacturer's nominal insulation thickness has been installed and certified and that all requirements of the Certificate of Verification have been met.
- The installer shall determine and the HERS Rater shall verify that insulation is in substantial contact with the assembly air barrier. When SPF insulation is being used to provide air barrier control, the SPF insulation must cover and be in contact with the entire surface of the framing, filling the cavity to a distance away from the framing specified in "Filling of Framed Assemblies" above.
- SPF insulation shall be spray-applied to fully adhere to assembly framing, floor and ceiling, the joists, and other framing surfaces within the construction cavity. When multiple layers of SPF material are applied, each foam lift (i.e. spray application) shall have adhesion at substrate and foam interfaces.
- SPF insulation shall not exhibit areas that:
1. Have voids or gaps in the uniformity of the insulation
2. Are extremely soft or spongy
3. Show the presence of liquid
4. Have blistering between lifts
5. Show differences in coloration of adjacent foam layers
6. Indicate the presence of other materials between lifts