HeatBloc-ULTRA is a Radiant Barrier Coating, water-based, low emissivity (Low-E) product and an excellent replacement for foil or metallized plastic film radiant barriers. In many situations, HeatBloc-ULTRA is the only economical way to retrofit a radiant barrier since it may be safely applied in enclosed areas at a low cost.
How it Works
HeatBloc-ULTRA has the lowest e-factor of all spray applied radiant heat barriers at .19. It blocks 81% of the radiant heat trying to come into your home or building.
Effects on Roof Shingles
There is no harmful effect to roof shingles and will not invalidate a shingle warranty, however, you should check your warranty and contact the manufacturer to verify their particular warranty requirements.
HeatBloc-ULTRA is designed to be applied to the underside of the roof deck and any gable ends of a house. Applying a thin, even coat to these surfaces creates an effective radiant heat barrier that will stop around 81% of potential radiant heat transfer into the attic.
This process can effectively cut the amount of radiant heat entering your attic. Less heat in the attic equals less heat entering the living space. HeatBloc-ULTRA works just like tree shade, keeping your home dramatically cooler. HeatBloc-ULTRA will also keep attic mounted HVAC ducts cooler. Cooler ducts means that your A/C will not need to work as hard when it is running.
- Low Emissivity, High Reflectivity
- Permeable, does NOT trap moisture
- Easily installed using standard airless or air atomization spray equipment; or rollers
- Does not block cellular, or antennae signals as can occur with foil products
- Improves efficiency of existing insulation
- Only economical way to retrofit Radiant Barrier to existing structures
- This Can increase the value of your home
WHAT IS HeatBloc ATTIC HEAT BARRIER?
HeatBloc is an aluminum colored, water-based, low emissivity (low-e) coating. When applied to building materials such as plywood, OSB or plasterboard, HeatBloc lowers their surface emissivity to 0.25 or lower, thereby blocking over 75% of the radiant heat trying to enter the home. It is classified by ASTM as an Interior Radiation Control Coating (IRCC).
HOW DOES HeatBloc ATTIC HEAT BARRIER WORK?
HeatBloc radiant heat barrier works by changing the emissivity of the surface where it is applied. Building products such as wood, brick, and plasterboard have high emissivity (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 lowers their surface emissivity to under 0.23, lessening their ability to radiate heart and therefore letting less heat penetrate the roof into the attic.
WHAT IS A RADIANT HEAT BARRIER?
Heat penetrates building 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 travels 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. These barriers address heat flows by radiation and a is a low-e surface placed in the path of thermal radiation that blcoks heat transfer.
WHAT IS EMISSIVITY?
Emissivity is the ability of a surface to radiate or emit energy in the form of long wave electromagnetic radiation. It is represented by a value from 0 to 1. The closer the value is to 1, the less effective the surface is at impeding radiant heat transfer. Wood has an emissivity of 0.90. Thus, when wood is heated above the temperature of surrounding surfaces, it will tend to transfer 90% of it’s heat energy by radiation. heatBloc, when applied to most non-porous surfaces, will decreas the surface emissivity to 0.25 or lower, allowing less thatn 25% of the heat energy to be transfered by radiation.
DOES HeatBloc DEGRADE OVER TIME? WHAT IS THE PRODUCT LIFESPAN?
HeatBloc does not lose its effectiveness over time like some products. Foils can tear and require the staples to penetrate the barrier. Foil chips can accumulate dust, which diminishes their effectiveness. HeatBloc will last as long as the surface area it is applied to is not damaged or disturbed and nothing is coming in contact with the product.
DO RADIANT HEAT BARRIERS LOWER HEATING COSTS?
While they are most effective at lowering cooling costs, studies performed by the University of Kansas have showed a 15% reduction in heat loss through the attic when radiant barriers are used.
WHAT IS THE COVERAGE RATE FOR HeatBloc-ULTRA?
Recommended coverage for HeatBloc-ULTRA is 325 – 500 square feet per gallon depending on the porosity of the substrate.
CAN HeatBloc-ULTRA BE USED ON SIDEWALLS?
Yes. HeatBloc-ULTRA is normally more effective when used under roofs. Roof surfaces are generally much hotter than sidewalls. Up to 80% of the summer heat gain is from above. Low e-surfaces become more effective in controlling radiant heat transfer as the temperature of the radiant heat source increases. however, in tropical climates where no insulation is used in sidewalls, HeatBloc-ULTRA can substantially help increase interior comfort levels.
CAN HeatBloc-ULTRA BE USED IN VENT-SKIN CONSTRUCTION?
Yes. In vent-skin roofs HeatBloc-ULTRA should be applied on the underside of the outer roof skin facing down into the vent channel. On vent-skin sidewalls HeatBloc-ULTRA should be applied on the inside of the outer skin facing into the vent channel.
CAN HeatBloc-ULTRA BE USED WITH RADIANT HEATING SYSTEMS?
Yes. It is an effective heat reflector when used behind wood stoves or on walls adjacent to ceiling mounted radiant heaters in commercial applications.
IS ATTIC VENTILATION IMPORTANT?
Absolutely! Radiant heat barriers only control radiant heat loads. Good attic ventilation helps control convection loads. Together they raise the comfort levels and lower cooling costs. Venting allows 2.5 air changes per hour should be specified as a minimum.
DO RADIANT HEAT BARRIERS HAVE AN “R” VALUE?
No. R-values apply only to solid insulation or to insulating systems that control heat flows other than radiation. In independent testing of the product at the University of Kansas, the R-value of the insulation, after applying HeatBloc-ULTRA-75 to the roof deck, increased by 87% to 98%.