If there is no insulation between the sheetrock and the roof deck between the rafters then you should definitely add insulation before putting a new roof on.
Radiant barrier roof sheathing reviews.
Here are instruction on how to install a radiant barrier under a metal roof.
Up to 97 of radiant heat from the sun is reflected by solarbord so the attic can be up to 30 cooler.
Cooler attic cooler house.
This means the rest of the house will be cooler too.
Radiant barrier sheathing emits 3 5 of the heat it absorbs and can reducesummer heat gain in the roof from 16 to 42.
As the original 1 brand of radiant barrier sheathing lp techshield panels vaporvents technology prevents moisture buildup during and after construction while blocking up to 97 of radiant heat in roof panels.
A radiant barrier must have an emissivity of 0 1 or less to be effective.
Some of thefacts they list are.
It reduces attic temperatures by up to 30 degrees fahrenheit and it blocks up to 97 of radiant heat.
The osb techshield radiant barrier osb is engineered to improve energy efficiency.
The energy star rated sheathing blocks up to 97 of solar radiant heat carries a limited lifetime warranty and can contribute towards ngbs nahb green approved leed and earthcraft home certifications.
Radiant barrier applied either under the roof rafters or under the roof sheathing is probably the most common application of a radiant barrier but many homeowners shy away from it because they don t fully understand what radiant barrier is or how it works.
The hot roof material then radiates its gained heat energy onto the cooler attic surfaces including the air ducts and the attic floor.
Thermostat radiant barrier sheathing is available in sfi certified plywood and osb panels for roof and gable wall sheathing.
Installed in over 2 million homes in the united states lp techshield panels also lower attic temperatures up to 30 f.
As for the metal roof i would install atticfoil radiant barrier below the metal roof.
A radiant barrier works best when it is perpendicular to the radiant energy striking it.
Foil backed osb is applied mostly in attics.
A cooler attic space means less heat moving to the cooler space below the attic.
A house protected by solarbord radiant barrier sheathing has a head start on comfort.
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.
There is a misconception that if the heat is coming in through the roof shingles and.
Specifications in selecting your radiant barrier sheathing make sure that the label indicated that the productemittance is less than 0 1 as measured by astm 1371.
Benefits of radiant barrier sheathing.
Oriented strand board osb with a thin layer of low emitting aluminum foil attached to one side is a common type of thermal radiant barrier sheathing.