The core of our popular garage door models, the
provide an insulation R-value of 10, more than twice
as much as common polystyrene insulation board the same
thickness. It's bonded to each steel section, creating a
composite structure with higher strength, greater rigidity,
improved dent-resistance and better thermal protection.
To understand how R-value and heat flow are related, it is
easier to think of your garage not as a single entity, but as
a part of a system with the external environment. As with most
everything in nature, heat will want to redistribute itself in
an effort to reach a state of equilibrium, or equal
temperatures on both the inside and the outside of your
garage. To do this, heat must pass through the garage door to
reach the other part of the system.
Door quality can impact the thermal efficiency of your
home. Your garage door is typically the largest opening in
your home. In the summer, heat is produced outside of your
garage. Thus, it is naturally hotter outside of your garage
than inside and heat will try to "get in" to even out the
system. If a garage door has an R-value of 3, 1/3 of the heat
will get through the door and into your garage. This does not
mean that the internal temperature will be 1/3 of the external
temperature, though. It just means that as more heat is
produced externally, 1/3 of it will enter your garage.
Insulating your garage door can help keep the heat out.
The opposite is true in the winter. Heat is produced inside
your garage in the winter, either by heating or by the effects
of the sun. As it is cooler on the outside of the door, heat
will try to escape to the outside through the door and other
parts of your garage to even out the system. If keeping your
garage warm in the winter is a priority, then choose a door
with a higher R-value.