material's resistance to conductive heat flow is measured or rated in terms of its thermal resistance or R-value -- the higher R-value, the greater the effectiveness.
R-value depends on the type of insulation, its thickness, and its density.
add R-values of the individual layers.
Installing more in your home increases R-value and the resistance to heat flow.
To determine how much insulation you need for your climate, use calculator or consult insulation contractor..
The effectiveness of material's resistance to heat flow also depends on how and where the insulation is installed.
R-value of wall or ceiling will be somewhat different from R-value of the insulation joists, and other building materials, in phenomenon known as thermal bridging.
By reflecting heat away from the living space, it's possible to calculate R-value for barrier or installation, the effectiveness of these systems lies in their ability to reduce heat gain..
The amount of insulation or R-value you'll need depends on your climate, type of heating and cooling system, and the part of the house you plan to insulate.
Also, remember that air sealing and moisture control are important to efficiency, health, and comfort..
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