To meet astm c1321 standards irccs must have an emittance rating less than 0 25.
Roof radiant barrier specs.
Considerable better than the doe s radiant barrier minimum classification requirements.
Radiantguard radiant barriers have an emittance of only 3 5 and a reflectance of 95 97.
When placed directly against another material these barriers actually promote heat transfer by conduction instead of blocking or reflecting it away.
To perform properly radiant barriers must be installed facing an open air space.
The radiant barrier reflects 95 of the radiant heat back to the roofing materials which then emits over 90 of the heat out the roof almost instantly.
Since radiant heat is in a waveform it can be reflected.
A radiant barrier works best when it is perpendicular to the radiant energy striking it.
A radiant barrier reduces the radiant heat transfer from the underside of the roof to the other surfaces in the attic.
The roof just keeps it dry.
Also the greater the temperature difference between the sides of the radiant barrier material the greater the benefits a radiant barrier can offer.
But there are actually many cons to radiant barriers that are not discussed.
So you want r value on your attic floor and radiant barrier at the roof.
A radiant barrier must have an emissivity of 0 1 or less to be effective.
A cooler attic space means less heat moving to the cooler space below the attic.
How do radiant barriers work.
Not just absorb or slow it down like other forms of insulation.
Installed in over 1 5 million homes in the united states lp techshield panels also lower attic temperatures up to 30 f.
Lo mit s low emissivity and high reflectivity provide paintable radiant barrier technology to a wide range of substrates and geometries.
So this begs the question are radiant barriers truly worth it.
The problem with putting any r value on a roof is that the roof is normally not really part of the thermal envelope.
Radiantguard radiant barrier foil insulation installed in an attics can reduce attic temperatures by up to 30 degrees when stapled with a staple gun to the underside of roof rafters by reflecting up to 97 of the radiant heat that strikes its surface thereby reducing heat transfer from the attic to living spaces resulting in lower utility bills.
When utilizing osb radiant barrier sheathing you can reflect up to 97 of solar radiation which translates into an attic heat reduction of up to 30 f.
The thermal envelope is usually your walls and ceiling.
How radiantguard radiant barriers benefit you.
Radiant barriers are a reflective foil insulation that reduces heat transfer into attics.
Radiantguard radiant barriers reflect block radiant heat.
This helps improve energy efficiency of the home.
High temperature tolerance superior flexibility and ease of use allow for applications in many varied industries to reflect light and heat.
