Spray polyurethane systems have gained popularity due to their numerous advantages as a thermal insulation
material. Homeowners, residential developers and businesses alike are looking to this material to improve the
thermal conditioning of their properties. When choosing polyurethane insulation, there are two basic types: open
cell and closed cell. Below are the key differences and properties of each type.
Open cell PUR polyurethane is predominantly open cell, which allows for diffusion. It is light and spongy, has a high expansion generally making it ideal for indoor applications (walls and under decks). It is applied by spraying with specifi c equipment that ensures a uniform structure and effi cient coverage. Some advantages of open cell foam include the absence of cold bridges, excellent adhesion to the substrate, air permeability and protection against overheating.
On the other hand, closed-cell PUR polyurethane has more than 90% closed cells, which gives it a lower permeability to air and water vapour. It is also applied by spraying, completely sealing the substrate and eliminating thermal bridges. It is mainly used in foundation structures, paving, tanks and as an anti-condensation barrier, although it needs to be waterproofed with adhoc systems/products.
Its advantages include increased hardness, long-term stability and the formation of an additional protective layer.
The choice between open-cell and closed-cell technologies depends on a thorough analysis of the
performance required for the project in question. In general, open cell foam is more suitable for indoor applications due to its light weight and fl exibility, while closed cell foam is mainly used in outdoor applications due to its stiffness and water resistance.
In summary, when choosing polyurethane insulation, it is important to consider the characteristics and properties of each type of foam (open cell and closed cell) to determine which is most suitable for the project in question.
In summary, when choosing polyurethane insulation, it is important to consider the characteristics and properties of each type of foam (open cell and closed cell) to determine which is most suitable for the project in question.
