Which Spray Foam Insulation is best?

Which Spray Foam Insulation Is Best?

Open-Cell vs Closed-Cell

Although we install both Open and Closed-Cell products, not all spray foams are created equal, therefore we are always careful to respect the application uses for both products in achieving the correct install for your building.

Open Cell

Open Cell is a low density, sponge like foam, which makes it an effective barrier against noise transmission whilst adding good thermal performance to a building. When used in areas that are susceptible to moisture intrusion, Open Cell foam could absorb this moisture which can create issues within the building or structure it is applied to. We are careful to fully assess a property before we choose whether it’s suitable for Open Cell and we would generally only recommend it’s use when there is no evidence of impact from damp and moisture. Due to it’s density, we would not recommend Open Cell Spray Foam Insulation in instances where you are trying to strengthen or bond a structure together. If your property is dry, has a good structure and is not showing any major signs of degradation, Open Cell Insulation could be the perfect choice for you as it is more cost effective than the Closed Cell equivalent and also lasts for the life of the building with no degradation or loss of performance.

When To Choose Open Cell:

  • Your Roof or Walls Are Structurally Sound
  • The Roofing Membrane is in Good Condition
  • Your Roof Or Walls Are Not Damp Or Condensating
  • If You Require Good Prevention Against Noise Transmission
  • When You’re On A Budget (Cheaper Than Closed Cell)
  • When You Have a Non-Breathable or Breathable Roof Membrane

When Not To Choose Open Cell:

  • Never Choose It To Be Applied Direct To Tile
  • You Shouldn’t Choose It To Combat Roof Leaks
  • Don’t Choose It For Structural Integrity

Closed Cell

Closed Cell is a high density rigid foam, that acts as a very good vapour barrier whilst adding great thermal performance, airtightness and structural improvement. It can be installed to just about any breathable surface or membrane and is used extensively as a solution for bonding roof tiles and extending the life of a degrading roof. It’s density means that it does not expand to the same depth as Open Cell Foam and is therefore more expensive per square metre. We would recommend Closed Cell in instances where you want to add structural improvement to the roof or walls structure and where you have concerns over moisture. It is not so good for soundproofing as it is a rigid and dense structure that offers little support to noise transmission. Closed Cell Foam is the perfect choice when you want exceptional thermal performance, airtightness and a truly future-proof solution for your property.

When To Choose Closed Cell:

  • When You Have No Roof Membrane But Don’t Want A Roof Replacement
  • If Your Rafters Are Degrading & You Need To Add Structural Integrity
  • When You Don’t Have Much Room For Insulation But Want Good Thermal Performance
  • If You Have a Moisture-Rich Environment
  • When You Have a Breathable Roof Membrane Or Surface To Apply To
  • If You Have a Cavity Wall (Closed Cell is Flood Defence Approved)

When Not To Choose Closed Cell:

  • Don’t Use It On Non-Breathable Surfaces
  • Don’t Use It If You Would Want To Remove It (It Bonds To Everything It Touches!)
  • Don’t Choose It For Soundproofing

The Takeaway

Both types of Spray Foam Insulation are extremely good at providing an airtight, thermal seal of your property to help to combat heat loss or prevent solar gain. The type of Spray Foam you choose should be based on whether it’s suitable for your property and will achieve what you expect it to. As a professional installer of Spray Foam Insulation, we have the experience to offer our guidance to ensure that the end result is one that works the best for you and your property.It’s always worth getting a second opinion when you get quoted for Spray Foam Insulation. Open Cell Foam is cheaper and easier for us to install but that doesn’t mean it’s a one size fits all.

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