Spray Foam - The myth that it rots your rafters

The Myths Of Spray Foam

Introduction:

As a nation, we are often dubious when it comes to new solutions that are designed to offer an upgrade on an outdated product or technology. Many of us like to play it safe with something that we know or trust, even if it’s not the best choice!

It’s important that you retain this level of caution when considering an alternative product or solution, it’s also important that you don’t discount something simply because you don’t understand it.

In this article we are looking at the myths surrounding Spray Foam Insulation so that we can help you to make an informed decision when choosing a better insulation solution for your home.

Whats the Myth?

You may have heard through a local roofing contractor that spray foam is a bad product that causes the timber roof rafters to rot.

When spray foam insulation was introduced into the UK in the 1980’s, it’s benefits were not primarily used for its excellent thermal performance. Instead, the closed cell variant of spray foam was used as a bonding solution, sprayed direct to roof tiles to hold them in place.

The trouble is that for a homeowner to seek a spray foam application direct to roof tiles, the roof must have been in bad condition otherwise you wouldn’t necessarily look to fix something that’s not broken. When we say “bad condition” we mean a roof with damaged and rotting rafters, pencil thin battens whose structural integrity was failing and slipped or cracked roof tiles.

Why the Myth isn’t true:

An application or closed cell insulation is something that is designed to last the life of the property, therefore, eventually when a roof is replaced, it’s natural for a roofing contractor to assume that the foam itself had caused the roof to deteriorate. Quite the reverse is true.

Removing roofing tiles bound with closed cell spray foam is virtually impossible without cutting the tiles with heavy duty tools. It’s no wonder that roofers dislike spray foam insulation but the facts are, it’s that good at adhering to the surface it’s sprayed to that it will undoubtedly prolong the life of a roof for decades.

The closed cell spray foam is the antidote to preserving the roof for the long term, saving homeowners with the significant worry of a costly total roof replacement. If installed correctly by an approved applicator, it won’t rot the rafters or deteriorate the roof structure, it will simply help to add integrity and longevity with the added benefit of fantastic thermal performance against heat loss.

The Takeaway 

We don’t want our product to be seen as a thorn in the side of roofing contractors. In fact, we always recommend that a homeowner considers a total roof repair of replacement before considering a closed cell spray foam application. For those who want a cost effective remediation of a failing roof, the closed cell spray foam is certainly an option to consider. 

You should be aware that once applied, it will be impossible to remove the spray foam without cutting the roof away. Any roofing contractor would absolutely attempt to talk you out of a spray foam solution for very good reasons but don’t be fooled by speculation that the closed cell damages and rots roof rafters, this simply isn’t the case!

You should be aware that once applied, it will be impossible to remove the spray foam without cutting the roof away. Any roofing contractor would absolutely attempt to talk you out of a spray foam solution for very good reasons but don’t be fooled by speculation that the closed cell damages and rots roof rafters, this simply isn’t the case!

Actionable Steps

• Check your roof to see if it has a membrane between tiles and rafters
• If the roof is damaged or failing, consider a repair or replacement first
• If budget doesn’t allow for a roof replacement, contact us for your free survey to see how our solution can help you.