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Frequently asked questions:

What is "SPF" (Spray Polyurethane Foam)?
The product which InTehBuild install, is a Closed-Cell, Rigid Polyurethane version of 'SPF', With superior Thermal Insulation performance, when compared to other 'SPF' formulations. Applied 'in-situ' with a special Blending Machine and Spray Gun, 'SPF' provides seamless Thermal Protection, onto virtually any surface.


How long does it take for the 'SPF' to form?
The two PU components mix in the last stage as it leaves the Spray Gun, and starts to react immediately. It is still a liquid when it hits the surface onto which it is sprayed, but rapidly rises to its designated thickness. A couple of factors determine the final rise of the foam, of which Temperature and Moisture is the most important. If sprayed on a floor or roof, it can generally be walked on after about 20 minutes (depending on the thickness sprayed). Full design-properties, e.g. Compression Strength, are reached after about 24 hours.

How does 'SPF' Adhere to the Substrate?
'SPF' is self-adhesive onto most clean surfaces, with only a few requiring an 'adhesion primer', e.g. Bitumen waterproofing and fresh Galvanised Steel.
During the 'liquid-state' the mixed material locks mechanically onto the surface at molecular level, creating an exceptionally strong bond.


What does "Closed-Cell" mean?
It refers to the Internal Structure of the foam. The gas which forms in the foaming process is permanently encapsulated in the tiny cells, with closed structures.
It is this trapped gas, which affords the product its exceptional resistance to Thermal Transmission through the foam. The Closed-Cell nature of the foam also makes it water-resistant.


What does "Rigid PU-foam" mean?
A PU-foam variant which cures to form a Rigid Structure, but still retains a certain amount of flexibility.

What is the Thermal Conductivity of 'SPF' material?
With a maximum aged Thermal Conductivity ('Lambda'  0.028 W/(m•K)

What is the WEIGHT of 'SPF'?
The product  which INSUSEAL install, has a Density of about 35 - 45 kg/m3
(but higher densities can also be specially ordered if required)It is very light for the strength it offers, e.g. 1m2 installed at 25mm thick weighs only 1,125 kg.

Can 'SPF' be installed onto substrates of any shape?
Yes, as it is liquid when applied, 'SPF' can take any shape. The only limitation would be the practical accessibility of the spray equipment and operator.


Can 'SPF' easily be shaped after it has formed?
Yes, the cured foam can easily be sculpted with simple tools.
Edges of foam which will remain visible on e.g. a roof, can be trimmed.

It is often used on Film sets, to create large sculptured objects, which are light and robust.
Cured 'SPF'is similar to PU-foam blocks used to shape surfboards.


Can you walk on it after installation?
Yes, the Density (45 – 60 kg/m3) and Compression Strength (0,20 – 0,40 N/mm2), is designed for it to be installed on Floors and Roofs, where it must be capable of withstanding occasional foot traffic. Only if heavier traffic is anticipated (e.g. regular maintenance of roof equipment with heavy tools etc.) do we recommend bonding an additional walkway mat (various options) on top of the foam, to protect it from excessive impact.


Is 'SPF' affected by Moisture?
No, the Closed-Cell structure makes the foam water-resistant. Closed-Cell 'SPF' is the only insulation approved in the US as "flood-resistant".

Can 'SPF' be used as a Vapour Barrier?
Yes, Closed-Cell 'SPF' is approved in US and Canada as a vapour barrier.

Can 'SPF' be used underground?
Yes, long-term studies in Canada have indicated that Closed-Cell 'SPF' can be very effective to insulate and enhance waterproofing of Basements.


What happens if the 'SPF' is damaged?
Even in the unlikely event of being accidentally penetrated e.g. by flying debris hitting a roof during a severe storm, due to the Closed-Cell Structure, it is not compromised and very easy to repair.

What Temperatures can 'SPF' tolerate?
The product  which InTehBuild install, is frost- and heat-resistant from -50°C to +100°C.

How Durable is 'SPF'?
Roofs insulated with 'SPF' have been lasting well over 30 years in places like the US, where the technology was first implemented, but should last as long as the building onto which it is installed.
Buildings with SPF Roofs, have superior performance in severe weather, as was shown during events like Hurricane Katrina.
Not only is the 'SPF' Material itself extremely durable, but it also protects and preserves the building components it covers.


Is 'SPF' affected by Sunlight?
Yes, if 'SPF' is to be left exposed to sunlight, it needs to be screened with a coat of paint, e.g. a good quality Roof Paint is usually sufficient to protect the foam.
'SPF' in these exposed situations will last almost indefinitely, as long as the protection coating over it is maintained.
Time intervals between re-coating on Roofs vary depending on the specific product, from about 8 years for good quality Acrylic Roof Paint, to almost 30 years for a good quality Polyurea coating.
White and lighter coloured coatings will generally last longer than the same in a pigmented version, but it doesn't affect the 'SPF' foam underneath.

Is 'SPF' a good Soundproofing Material?
Closed-Cell 'SPF' effectively reduce noise from outside sources by sealing cracks and gaps that allow sound to travel through the walls, floors and ceilings into the building.
Closed-Cell 'SPF' generally absorbs more sound from the lower frequencies.
To a degree they are effective against noise caused by vibration, but this is where the Density of the foam plays a bigger role.
An Open-Cell 'SPF' version is available for special order which can absorb a wider range of Sound Frequencies, but this can only be used for Internal applications.

At what point in the construction should spray polyurethane insulation be applied?
Normally spray polyurethane insulation is installed at the same point in the construction cycle as other types of insulation. That is, it should be installed after the rough plumbing, electrical wiring, and heating and air conditioning ducts have been installed. If you decide to seal the entire exterior shell with spray polyurethane, spray insulation may need to be applied in some areas before the ductwork is installed.

Can a building owner apply spray polyurethane insulation?
Not practically. Spray polyurethane application requires complex equipment and a skilled installer with training in the safe and proper installation of the polyurethane system.

Won't sealing my building with spray polyurethane foam lead to indoor air quality problems?
Your building does need to be ventilated in order to maximize the quality of indoor air (moisture levels and contaminant levels). Most design professionals will advise you to seal the structure as tight as possible and provide the necessary ventilation through the heating and air conditioning system. Many systems employ a highly energy efficient "air exchanger" which is designed to pre-condition (either warm or cool) the incoming outside air with the outgoing exhaust air. In this manner, you can build an extremely energy efficient exterior shell using high performance spray polyurethane foam while still providing controlled and energy efficient ventilation.

Is spray polyurethane insulation code approved?
Yes. Building codes provide for the use of spray polyurethane insulation in the Foam Plastic section. This section of the code also describes the use of thermal barriers.

Does spray foam gives off any VOC gases?
Sprayfoam is not considered to be a VOC emitter as are a lot of adhesives and solvent based paints. During application some VOCs may be released but after curing the it is very difficult to measure any chemical emissions from the foam. Many suppliers have performed testing on their foams. All of the foams in Canada are required to have testing for VOCs. Check with the foam supplier for additional data.

Which is better, closed or open cell?
Both systems offer significant advantages over fiberglass batting: ability to air seal; ability to fill cracks and conform to odd shaped cavities; and ability to hold their shape over time and under adverse conditions.
But only closed-cell foam has the thermal insulation value (R-value) to bring your home up to Energy Star® standards with only one-half the thickness required for fiber insulations. In addition, closed-cell foam products increases the strength of you wall system (it's approximately doubled) and increase the water resistance of your home's exterior. Open cell insulation is less expensive and provides supplier sound deadening characteristics.