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HeatBloc-75 can effectively cut
the amount of radiant heat entering your attic. Less heat in the attic
equals less heat entering the living space. HeatBloc-75 works just like shade
trees, keeping your home cooler. HeatBloc-75 will also keep attic mounted
HVAC ducts cooler. Cooler ducts means the AC will not need to work as hard
as when it is running.
What
is HeatBloc-75?
HeatBloc-75 is an aluminum colored, water based, low emissivity (low-e)
coatings. When applied to building materials such as plywood, OSB or
plasterboard, HeatBloc-75 lowers their surface emissivity to 0.25 or lower,
thereby blocking 75% of the radiant heat trying to enter the home. It is
classified by ASTM as an Interior Radiant Control Coating (IRCC) and may be
effectively used as an interior radiant barrier.
How
does Heat-Bloc75 work? HeatBloc-75 radiant barrier works by changing the
emissivity of the surface where it is applied. Building products such as wood,
brick, and plasterboard have high emissvities (0.7-0.95). When heated, they
radiate most of their heat to cooler surfaces by allowing the heat to
penetrate the roof into the attic and from the attic into the house.
HeatBloc-75 lowers their surface emissivity to 0.25, lessening their
ability to radiate heat and therefore letting less heat penetrate the roof
into the attic.
What
is Radiant Barrier? Heat penetrates buildings in three ways: conduction,
convection and radiation. Radiation is the transfer of heat by
electromagnetic waves known as thermal radiation. Thermal radiation is a
form of invisible light that ravels through the air from a warm to a cool
surface. Warm surfaces, such as roof decks warmed by the sun, will radiate
or emit their heat to cooler interior building surfaces. Radiant barriers
address heat flows by radiation. A radiant barrier is a low-e surface
placed in the path of thermal radiation that blocks heat transfer.
Does
HeatBloc-75 degrade over time? HeatBloc-75 does not loose its effectiveness
over time like some radiant barriers. Foils can tear and require the
staples to penetrate the barrier. Foil chips can accumulate dust, which
diminishes their effectiveness.
Is
HeatBloc-75 permeable to water? Yes! HeatBloc-75 allows water vapor to
permeate, and does not trap water vapor within roof decks or sidewalls.
This is very important in attic conditions.
Do
radiant barriers lower heating costs? Yes, but only modestly. They are most
effective at lowering cooling costs. For more information about this
product, please visit STS Coatings, Inc. official site, www.heatbloc.net.
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