When spray foam fails - lingering odour, shrinkage, pulling away, soft spots - the cause is almost always the installation, not the material. Foam applied on-ratio, at the right temperature, to a clean substrate, in correct lift thickness, performs for decades. Here's what goes wrong and how to avoid it.
The common failure modes
- Off-ratio mixing - the two parts must meter exactly; wrong ratios leave foam that never cures right and keeps emitting.
- Wrong temperature - substrate or chemical too cold (a real Alberta risk) ruins the reaction and adhesion.
- Too thick per pass - overheats and cures poorly; closed-cell must go on in controlled lifts.
- Poor prep - dust, moisture or frost on the substrate kills adhesion, causing pull-away.
How to hire so it doesn't happen
- Use a CUFCA-certified installer working to CAN/ULC-S705 - the certification exists precisely to prevent these errors.
- Ask about substrate temperature and lift thickness; a pro has a clear answer.
- Get the warranty and the standard in writing.
The lesson: the product is reliable; the installer makes or breaks it. See certifications and how to choose a contractor.
Thinking about spray foam? Get a free quote from a vetted Alberta installer.