Failed Spray Foam Removal And Replacement In Chatham, Ontario

Off-Ratio Foam, The Usual Cause

Spray foam is two chemical components mixed at the gun in a precise ratio. Get that ratio wrong and the chemistry does not complete.

Off-ratio foam does not cure properly. It stays soft or turns brittle, it does not bond, and it keeps releasing compounds long after it should have stopped.

Causes are equipment not properly maintained, incorrect temperatures at the gun, or an installer who was not trained to spot it happening.

It is the single most common reason we get called to a failed job, and it is not repairable.

What Failure Looks Like

A chemical smell that never fades. Properly installed foam stops smelling within the manufacturer's re-entry window. One that still smells weeks or months later was sprayed off-ratio.

Foam pulled away from rafters, purlins or studs, sometimes by half an inch or more. That gap is a continuous air channel, which cancels out the air sealing you paid for.

Crumbly, brittle or powdery texture instead of firm and consistent.

Discolouration, or foam that varies noticeably in colour and density across the same surface.

Foam peeling off sheathing or steel, which means it was sprayed onto a surface that was dirty, damp or too cold.

Sprayed Too Cold

The other common cause, and a real risk in this climate.

Every product has a minimum substrate temperature. Spray below it and the foam will not bond or cure properly, and it will shrink as it fails.

In an unheated barn or shop in a Chatham-Kent winter, hitting that temperature means bringing heat into the building first. That costs money and takes time, so it is exactly the step a rushed job skips.

We measure substrate temperature rather than air temperature, and we price the heat in.

Why It Cannot Be Sprayed Over

New foam bonds to what it is sprayed onto. If that is failing foam, the new layer fails with it.

Spraying over an off-ratio layer also traps whatever is still off-gassing underneath, which makes the smell problem worse rather than better.

The only honest answer is mechanical removal back to clean substrate, then reinstallation with the cause addressed.

Anyone offering to fix a failed foam job by adding more foam is telling you something useful about how they work.

What The Rework Involves

Removal, mechanically, back to clean framing or cladding. This is the labour-intensive part and it is most of the cost.

Assessment of the substrate underneath, including any moisture damage that occurred while the failed foam was in place.

Identification of why it failed, so the replacement does not repeat it.

Then reinstallation to a written specification, with thickness verified and documented.