What Is Spray Foam Insulation?

Spray foam insulation is an option for conventional building insulation like fibreglass. It is a mixture of two components including Isocyanate and polyol resin which emerge from the tip of the gun and creates foam that can be used to spray on roof tiles, concrete slabs and wall cavities. It can also be used through holes which are drilled inside the cavity of the finished wall. Polyurethane is the most used type of spray foam insulation that was produced back in 1940s and was used to apply on aeroplanes. The high-pressure technique is commonly used in new home construction as it is the quick form of spray foam. Another type of spray foam is low-pressure foam that is used for remodelling jobs. This is also recognised by the names of rise formula and injection foam.

Spray Foam Insulation

Types of Spray Foam Insulation

Spray foam insulation can be characterised into two distinguished categories:

  1. Open cell: Open cell is a category of foam where the minute cells are not totally closed. Open cell is less costly because it uses smaller amount of chemicals. It is a very superior air obstruction but does not present any kind of water vapour barrier. It is more like a sponge in look. It is frequently used for internal walls because it provides sound diminution. It is not suggested for outdoor applications.


  1. Closed cell: Closed cell foam insulation is much thicker than open cell. It has a minor and much-condensed cell structure. It is a very good air barrier as well as a water vapour barrier. It is repeatedly used in roofing projects or other outdoor applications, but can be used everywhere in the home.


There are several advantages of Spray foam insulation:

  • It saves on energy costs and also reduces service bills.
  • It has been studied that almost 40% of home energy is lost due to air infiltration through walls, windows and doors.
  • The buildings which are treated with spray foam insulation normally insulate almost 50% better than the conventional insulation products.
  • The insulation shields against moisture and provides benefit of reducing the chance of harmful mould and mildew.
  • It eliminates the growth of mould and also reduces the odds of rotting wood at homes and also from harmful allergic reactions to mould spores.
  • It builds a normal temperature for your home and also controls moisture.
  • It is also sometimes used to reduce noise as it acts as a barrier against airborne sounds and diminishes airborne sound transfer through the roof, floor and walls of a building.

Resistance to heat

R-value is the term which is given to the thermal resistance. Higher the R value; more is the effect of insulation. 1.8-2 pound polyurethane foam has the uppermost R-value of readily available insulation used in homes and buildings. Accordingly to the high thermal resistance of the gas, spray polyurethane insulation normally has an R-value around R-5 to R-6 per inch.

Ecological Effects

Insulation of all the types stops at a good deal of energy loss. Some types of insulation including spray foam are used to seal air from escaping out. Insulation can also save energy in hot climate as it can reduce air conditioning use. The level of insulation varies and it can be up to an R value of 6.7 per inch.