Spray foam insulation is spray applied plastic that forms a continuous insulation and an airtight barrier on walls, roofs tiles, concrete slabs, corners and into wall cavities. It is a compound composed of two products, isocyanate and polyol resin. The two products react quickly and expand on contact to form an expanding form. The form is known to insulate heat, water vapor, air and unwanted infiltration.There are three types of spray forms,
High density used for exterior and roofing, medium density used for continuous insulation, crack filling and invented attic application. Low density used for the interior cavity filling. Sprayed form is preferred to other insulation such as wood and fiberglass because it is more efficient and more effective. Spray foam should be handled by professional commercial spray foam insulation companies as the likes of Spray foam Kings ,this help to determine the best components to use and the ratio of the mixture to be used.
There are certain things one should know about spray foam insulation;
Spray forms insulators are by-products of petroleum chemicals, they have carbon structures and just like any other product, they are flammable and will rapidly burn out in the case of a fire breakout. Houses with sprayed foam insulation are known to burn completely, and quickly.
‘Soy based’ forms and other ‘green form’ are not completely safe as they contain only seventeen percent of biodegradable content and the rest being petroleum based contents.
Sprayed foam insulation does not protect against moisture, instead; it repels water and this is not as good as it sounds. The form directs the water to the closest wood or metal that leads to corrosion of the metal and rotting of wood. Application of cellulose content to the wood and metal help in dispersing the moisture, and prevents corrosion and rotting.
A lot of energy is used to make foam insulation, it takes close to 28 joules to produce a single pound of form insulation, yet it takes only 0.7 joules to produce a single pound of cellulose insulation. This greatly increases the cost of form insulation compared to other insulation.
The R- Value of form insulation is better than R- 3.8 per inch of cellulose, however, form insulation are not very effective in filling wall cavities, where the form is used, then cellulose is used to fill the cavities.
Low-density foam insulation creates large air bubbles and voids as the form expands, Cellulose, on the other hand, is densely packed without gaps and voids.
Due to climatic conditions, the world is adopting recycle products, form insulation is not recycled, Cellulose insulation, on the other hand, is 83% recyclable.
Form insulation does not detect molds and parasites, cellulose insulation has natural occurring minerals that prevent the growth of mold and also kills pests.
whenever form insulation is used, then houses need to have good ventilation systems, this is because foam blocks all air paths and can cause health problems and humid environment.