Spray Foam Insulation FAQs
Over ten years of spray foam expertise has given us a vast technical knowledge. Some of the most common questions are answered below.
What are the differences between closed-cell and open-cell foams?
There are three major differences. Firstly, BASF uses the versatility of chemistry to offer a closed-cell content of greater than 90 percent for all of its formulations, and open-cell foams commonly used as insulation systems have approximately 90 percent open-cell content. Secondly, closed cell content offers a thermal conductivity of between 0.028 W/mk and 0.025 W/mk, depending on the thickness applied. Open cell offers 0.039 W/mk. Thirdly, both closed cell and open cell foams are virtually impermeable to air, while open cell foam will allow far more vapour to pass through it.
We do not recommend open cell foams for treatment of condensation to any substrate that is impermeable. This includes, profiled steel roof and wall cladding and non-breathable roofing felts. The poor vapour resistivity of open cell foams can lead to interstitial condensation and subsequent waterlogging of the insulation.
How are polyurethane foams applied?
What equipment is required?
Are there any special handling considerations?
Always use personal protective equipment, avoid all contact with skin and eyes and do not inhale the vapours of the hardener. Before opening the resin, unscrew the bung slowly to release the gas pressure in the drums.
While spraying, always work with adequate ventilation. Protective gloves and face masks are mandatory. When atmospheric levels may exceed the occupational exposure limit (PEL or TLV), approved air purifying respirators equipped with an organic vapour sorbent and particulate filter can be used as long as appropriate precautions and change-out schedules are in place. Persons with known respiratory allergies must avoid exposure to the A component.
What is the insulation U-value of your systems?
What are the differences between roofing foams and wall foams?
What is an insulating air barrier system?
Does polyurethane technology control air leakage?
Can an insulation system add structural strength?
Spray-applied closed-cell polyurethane foam is the only insulation material that adds structural integrity throughout the wall system. Testing shows spray-applied polyurethane foam insulation between wood- and steel-stud wall panels, increases rack and shear strength, two to three times compared with standard timber frame components with glass fibre insulation, when sprayed onto gypsum wallboard, and increases racking strength when sprayed onto oriented strandboard (OSB).
Closed cell foam injected into a cavity, has enough strength to bond two leaves of a masonry wall together, in situations where the existing wall ties have failed.