The cost of insulating your complete house with spray foam insulation can be estimated by our Spray Foam Cost Calculator. Your estimated cost for spray foam insulation is determined by the size, thickness, depth of the wall and roof frame, required R-value, and other factors of the house. The most energy-efficient type of home insulation is spray foam insulation . It minimises heat loss and offers a tight seal of insulation. The two primary varieties of spray foam insulation include closed cell and open cell, both of which offer high R-Value. R-Value for closed-cell is twice as high as for open-cell . Ultimately, a closed cell will significantly reduce heat loss. How much does spray foam insulation cost? Prior to insulation application, a skilled installer will undertake a survey to evaluate the substrate quality, U values, and the possibility of condensation. This will influence a number of things, including how much ventilation may be needed to avoid condensation and the approp