There’s a chance your home-reno could keep you from selling your house. 

A couple in the UK was recently unable to sell their home after installing spray foam insulation. 

The way the foam is installed and how much ventilation it has could cause damage to roofing timber, particularly in colder climates, and New Zealand installers have to produce a statement saying the work complies with the building code. 

Healthy Homes Cooperation Director Damian McGill told Ryan Bridge that there’s nothing wrong with spray foam per se, and it can be a great product when used correctly. 

But he said that when you add retrofit insultation, you have to improve the ventilation as well, otherwise there’s a risk moisture could build up in the cavities.  

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