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FAQ - Frequently Asked Questions  




> Can it be applied to wood?


POLYNOR blends perfectly with wood, forming a monolith with it, which excludes the penetration of moisture inside, which promotes the formation of fungus and mold.

The wood does not rot!

You can see the account of one of our first customers who inspected insulated wood after 5 years:



> What are the advantages over polystyrene / XPS and wool?


With POLYNOR you don't need:

- a flat surface,

- wind / moisture resistant film,

- membranes,

- mechanical fasteners,

- glue,

- cutting the insulation to the desired shape and size,

- oversized transport,

- qualification for insulation installation,

- a large room for the one-time purchase of insulation material.




> Why is Polynor so expensive?

The choice of insulation often starts with a comparison to the cheapest, the lowest quality products and often does not take into account the overall cost, which includes additional materials necessary for proper installation. As a result, the final cost of insulation is much more than the price of a square meter of insulation on a store shelf. It is also worth mentioning the very significant cost, which consists of assembly. Traditional insulation methods are often very time-consuming, which in times of construction boom translates into a very high cost of installation and problems finding a good contractor.

To sum up, in the end, Polynor foam insulation is at least equal to the cost of other methods, and in most cases much cheaper and more effective.



> Is it safe and environmentally friendly? Does it attract rodents and insects?


Absolutely ecological! (biologically inert material). It does not react with water, air, cold or heat in the range from - 80 to 121ºC.

It does not contain freon, formaldehyde or other harmful substances.

Foam is an unattractive environment for rodents and insects.



> What is the yield of 1 can?

The capacity of one can per square meter at a thickness of 30mm is up to 2m2, observing the principles of the instructions for use.

In one pass, you can apply a layer from 1cm to 4cm. Layers are applied 20 minutes apart from the previous one. The number of layers is unlimited, and the thickness of one layer is regulated by the time the foam is sprayed on a given fragment of the insulated surface.

We recommend applying several layers, first the first contact layer 1.5 - 3cm, and then subsequent layers up to 4cm depending on the desired thickness of insulation, which will correct the defects of the first layer and ensure the best tightness.


> Is this mounting foam?


With superficial similarity, they are two completely different products in terms of properties, purpose and characteristics. Unlike assembly foam, Polynor has a low water absorption coefficient, closed cell structure, does not shrink and remains flexible, adheres completely (without gaps) to the insulated surface. In addition, the mounting foam cannot be applied using the wide jet from the nozzle, which is included with the Polynor foam. More on this topic in the article:




> Can I handle the application of Polynor foam?

Yes of course! You don't need to have any special skills to use it. All you need is an ordinary polyurethane foam gun and a special nozzle that is next to each can of Polynor. Polynor 3D has two nozzles for straight and angular application.


> How much does Polynor cost?

The retail price recommended by the manufacturer is EUR 9.70 / item.

When buying large quantities, discounts is possible. You can get more detailed information about the offer from Polynor distributors:




> Can I use Polynor as waterproofing?


No, Polynor foam is not waterproofing and is not used to stop leaks in the roof or walls.


> Can I use the product on steam and waterproofing foils?




No, because they do not have rigid attachment to the surface. In a situation where, for example, the attic has already been fitted, there are two exits:

tear off the foil and spray the foam directly on the decking / roof tile / roof tile,
if we want the film to remain, we can put 2 / 3cm sheets of XPS styrodur between the rafters, use Polynor foam as the adhesive, and then cover the XPS sheets with the desired layer of foam. EPS attic should not be used on attics, because it is not very resistant to high temperatures occurring in summer, which causes it to shrink and form thermal bridges.




> What building materials can I apply to POLYNOR?


POLYNOR is a unique insulation that combines with all building materials except membranes and films.


> What is the product lifetime?


POLYNOR is a polyurethane foam with closed cells, whose service life is 50 years, depending on the operating conditions.




> Is it flammable?


POLYNOR is in the product group according to GOST 30244-94 - "G3". This class of flammability defines the product as flammable, non-saturated fire.

To obtain a better flammability class up to G2, a dedicated flame retardant POLYGUARD is used, which is applied to freshly applied foam (about 1 liter per 10 m2)

POLYNOR foam flammability test:



> What is the density per m3?



19 - 25 kg / m3 at 22ºC and 65% relative humidity


> Is Polynor afraid of water?

No, Polynor does not absorb water. The coefficient of water vapor penetration and water absorption is close to zero. Of course, remember that Polynor is not waterproofing and submerged in water in the long run will eventually absorb water.


> I'm afraid of condensation. What will happen when I use Polynor?


For external or internal insulation, the dew point will be inside the insulation and thus no condensate will form. The formation of condensate is a reaction to the contact of warm air with a cold surface during high humidity.

Inside - the foam contact surface will have the same temperature as the wall - no condensate will occur.

Outside - the contact surface of the foam with the wall will have the same temperature as the wall - no condensate will occur.

Of course, remember to keep sufficient layer thickness.




> What layer thickness do I need?


Recommended thicknesses of the POLYNOR foam layer envisaged for Polish climatic conditions are:

  • walls - 5cm
  • attic - 8cm
  • foundations - 10cm



> What is the difference between POLYNOR and POLYNOR 3D?



POLYNOR 3D has 2 nozzles for each container (angular and standard) and has an improved formula and can cover a larger area (1m2 with a layer of 6cm).




> Can I apply plaster?



Plastering the POLYNOR foam outdoors is not recommended because closed cell foams tend to expand due to the temperature rise.

You can plaster POLYNOR foam from the inside, however it is recommended to use thermal plaster for this purpose.



> What is the technology for outdoor use?


Foam not protected against UV radiation will oxidize and degrade in a short time, so it is necessary to protect it by closing it, e.g. under siding, panels, imitations of wood, etc. The technology of using the product on the facade looks as follows:

  • guides should be attached to the building, to which siding or other finishing materials will then be attached
  • moisten the insulated surface and apply the product according to the instructions. Leave a gap of 3-5 cm between the solidified foam and the panels, because closed-cell foams tend to expand due to the increase in temperature.
  • 24 hours after applying the product, you can cover the foam with panels.

> How to apply on smooth galvanized steel?



The use of POLYNOR foam on galvanized sheets is possible, however it is critical to comply with the instructions and follow the procedure below:

  • clean surfaces from dirt and dust,
  • degrease
  • wipe dry thoroughly.



> Should I leave a gap between the foam and the lining?



It is necessary. POLYNOR is a polyurethane foam with closed cells, therefore, as the temperature increases, it is possible to expand it, so it is required to leave a 2-3 cm gap between the solidified foam and the cladding.



> How to protect the foam against UV and on foundations?

It is necessary to protect the foam against UV radiation by covering it with a cladding (osb board, siding, G / K board etc.) or protecting it with water-based paint.

When using foam to insulate foundations that are located in damp areas, it is recommended to use additional waterproofing. Water-based bituminous masses (usually with the symbol "ST") are used to waterproof foundations. After 24 hours, bituminous mass can be applied directly to the foam.

> Should I wet surfaces before application?



Before applying foam, moisten porous building materials such as: brick, aerated concrete, gypsum, concrete, wood.

Smooth and non-absorbent surfaces such as glass, metal, plastic - do not wet.

In both cases, it is recommended to wet the foam after application, no later than in the first 8 minutes.


> Which gun is right and where to buy it?




Almost every professional polyurethane foam gun fits into the nozzle that comes with every POLYNOR foam container. The main thing is that the nozzle tightly adheres to the tip of the gun barrel.

The guarantee of compatibility and quality of the gun is the purchase of a dedicated, professional POLYNOR gun with a set of 3 angular nozzles.





> Can I apply Polynor into voids?


Yes, but only between rigid materials (concrete, brick) to eliminate the risk of them being pushed out by the expanding product.



> At what temperatures can I use it?


Surface temperature from + 5 ° C to + 30 ° C

Container temperature - from 18 ° C to 25 ° C





> How fast does it dry?

Surface film formation - 4 min.

Cure speed (time between successive layers) 20-40 min.

Full polymerization - 24 hours.


> Can I use it as sound insulation?


You can get an absorption coefficient of up to 55db.

Difficult to understand ? See movies:





> Can it be applied to polystyrene / wool?



POLYNOR blends perfectly with polystyrene, forming a monolith with it, which excludes penetration of moisture inside, which promotes its corrosion and the formation of fungus and mold. However, it should be remembered that foamed polystyrene is a heat-shrinkable material and for applications such as attics is not the best idea. In summer, the roof temperature can exceed 80ºC, and this is the temperature that will cause the foam to shrink and cause thermal bridges, which is why it is better to use XPS styrodur for this type of application.


Foam spraying on wool is not possible because Polynor requires a rigid / solid surface to foam and bind.




> Will my house breathe?



Already many years ago the ATLAS laboratory described hygroscopicity, that is, the so-called "wall breathing". Referring to their study we quote the summary:


"Building breathing does not exist in today's construction!"

The topic of wall breathing has been broadly described in the article on our website:


We also encourage you to read the development of the portal construction and other studies available on the Internet about the "breathing walls":,5766,oddychanie-scian---mit-czy-rzeczywistosc,d_sciany