No, that type of foam installation is called injection foam. While the product injected can be of similar quality there are many different methods and products on the market.

Spray foam application is a lot different. The installer can see and verify the quality of what’s been insulated when using spray foam.

Containers – Provides the best insulation for shipping containers. Applied directly to the steel, it eliminates condensation, adds structure, and maximizes internal space.

New Build Homes – An outstanding insulation option for walls, roofs, and underfloors. Delivers airtightness, moisture control, and long-term energy efficiency.

Existing Homes – Ideal for retrofitting under suspended timber floors or insulating roof cavities. Greatly reduces drafts, heat loss, and moisture issues.

Commercial Buildings & Workshops – Perfect for warehouses and workshop environments. Closed cell foam reduces hot radiant heat, improves comfort, and forms a continuous thermal and moisture barrier on steel, concrete, or ply. Multi-level buildings.

Agricultural Buildings – Effective in sheds, barns, and processing facilities. Handles high humidity, deters pests, and adds structural strength. Perfect for climatizing storage sheds, processing facilities and pack houses for potatoes, kumara, fruit & vegetables.

Transportable Units / Tiny Homes – Maximizes R-value in limited wall cavities. Closed cell foam reduces weight while offering excellent insulation performance.

Roofs (Steel or Ply) – Can be sprayed directly to the underside of roofing to control condensation and stabilize internal temperatures reducing hot radiant heat from above in working environments.

Concrete Slabs – Used below or above concrete floors to reduce heat loss through the ground. Also improves slab performance in cold climates.

Vehicles / Specialty Projects – Used in food trucks, mobile homes, or refrigeration trailers where moisture resistance and temperature control are critical.

The right choice depends on your needs. Closed cell foam provides maximum insulation, moisture resistance, and structural strength. It is ideal when space is limited because it offers more insulation in a thinner layer.

Open cell foam is a more affordable option that works well for soundproofing and filling irregular spaces. It expands more than closed cell foam but is not as moisture-resistant.

Both closed cell and open cell spray foam can be used for walls and roofs, but they serve different purposes. Closed cell foam is the better choice when maximum insulation, moisture resistance, and structural reinforcement are needed. Open cell foam, on the other hand, is often used for walls and roofs where soundproofing, flexibility, and cost-effectiveness are the main priorities. The best option depends on the specific needs of the project.

In most cases, No. Closed cell spray foam does not require a ventilation gap*.

Other insulation materials (like fiberglass batts or polystyrene) rely on ventilated cavities to help moisture escape and dry the building out. That’s because they don’t block air or moisture, so the wall or roof system is designed to “breathe” through gaps and vents.

Spray foam works differently.
Closed cell foam is a vapour barrier and insulation layer in one. It bonds directly to timber, steel, or concrete and prevents moisture from entering in the first place – eliminating the need for a ventilation gap. In fact, adding an unintended air gap can reduce performance and reintroduce condensation risks. A spray foam envelope seals out air and moisture, helping control condensation and improve energy performance.

Want a ventilated cavity anyway?
If your project requires or prefers a ventilated build-up, we can install spray foam in combination with a service cavity or ventilated cladding cavity – as long as it’s framed to allow this. Just let us know during planning and we’ll tailor the install to your build.

It depends on the situation & design specifications.

In a typical timber-framed home using batts or polystyrene, building paper (wall or roof underlay) is used behind the cladding to catch and redirect condensation.

Warm air from inside the home passes through the wall and hits the cold cladding — which causes condensation. The building paper stops this moisture from reaching the timber or insulation, and allows limited vapour to escape.

Generally wrap is not needed with closed cell spray foam acts as both an insulation layer and a moisture barrier.

Because it seals the entire cavity and prevents warm air from entering, condensation doesn’t occur in the first place. The wall or roof doesn’t need to “breathe” the same way because foam stops the moisture at the source.

However, if your project is designed with a ventilated cavity or drainage layer (e.g., ventilated cladding or service cavities), we can apply foam in a way that respects that — as long as the frame allows it.

Spray foam makes your home airtight – and that’s a good thing. It stops heat loss, moisture ingress, and uncontrolled airflow through gaps in your walls or roof.

But ventilation and insulation go hand in hand. Modern homes are designed to be sealed for efficiency, and ventilated on purpose – The new way of the house “breathing” is through ventillation systems such as extractor fans, passive vents, or mechanical systems (MVHR/ERV/HRV) to bring in fresh air and remove moisture.

Airtight means energy-efficient – and with proper ventilation, your home still “breathes” the right way.

Once a blower door test is done, the difference is astounding.

A blower door test is used to measure how much air leaks in and out of a house. It works by temporarily sealing the front door and using a fan to pressurize or depressurize the building, then measuring how many times the entire volume of air inside changes per hour — known as ACH (Air Changes per Hour).

• A typical new build with standard insulation and building wrap might test around 5–9 ACH, which still allows a lot of heat and air to escape.

• A well-sealed home using closed cell spray foam often tests between 1.5–2.5 ACH — a major improvement.

• Passive Homes aim for less than 0.6 ACH, but that requires very specific design.

The lower the number, the better the airtightness — and the more energy efficient and comfortable the home becomes.

When a home is properly sealed with spray foam:

– There are fewer drafts, less dust, and reduced pollen or outdoor pollution sneaking in through walls or roof cavities.

– It’s much easier to control temperature and humidity, so the home stays cooler in summer and warmer in winter.

– People with asthma, allergies, or chemical sensitivities often notice a big difference in air quality.

Airtightness isn’t about trapping air — it’s about controlling it properly for a healthier, more comfortable home.

Our codemarked Closed cell spray foam has an RSI value of 1.1 per 25mm of thickness.

The RSI value (thermal resistance) measures how well a material resists heat flow—the higher the value, the better the insulation.

In New Zealand, typical application thicknesses and RSI values are:

• Walls: 50mm  (R2.2)
• Roofs: 75mm to 150mm (R3.3 to R6.6)
• Underfloors: 30mm to 40mm (R1.3 to 1.76)

Thickness may vary based on climate zone and specific building requirements.

*Please note:

RSI values are metric, while R-values (used in the US and other regions) are imperial. To compare NZ’s RSI value with overseas R value use the following caluculation, RSI = R ÷ 5.678.

Example R21(US) = RSI3.7(NZ)