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To Understand how insulation works we need to understand heat transfer in your environment. Heat transfer follows three principles:
Conduction is the capacity of heat to move through materials. Think about how a coffee cup warms up from the hot liquid and can burn your hand.
Convection is the transfer of heat by movement of the heated parts of liquid or gas. This is why your coffee cools down by adding cream.
Radiation is the process in which heat is emitted and transferred as waves. This is how we receive heat from the sun.
Heat flows from the warmer environments to cooler ones.
In winter, heat moves from heated spaces to unheated rooms and eventually outside. Heat moves through walls and closed windows as radiation. Heat loss through closed windows is most prevalent at night and called the black body effect. Closing your blinds will ensure that your insulated house work at peak efficiency.
During hot summer months, heat moves from outside to inside.
The proper insulation provides resistance to the excessive heat transfer.
Insulation resistance to heat transfer is rated according to thermal resistance or R-value. A higher R-value means better insulation efficiency.
The R-value varies with the type of insulation, density, thickness, moisture and the age of the material.
Of all the types of insulation, spray foam insulation offers the highest r-value per thickness. Professional spray foam insulation has several benefits for any project.
Spray foam also reduces air leaks better than other insulation types. It fills awkward spaces easily and completely. Spray foam insulation is simply better at reducing heat loss through both conduction and convection.