Radiant Barrier On Top Of Roof Decking

This allows the radiant barrier to remain dry while also achieving the 3 4 air space requirement.

Radiant barrier on top of roof decking. But on the bright side. A radiant barrier can be effective with an asphalt shingle roof only when installed inside the attic either to the underside of the roof decking or to the underside of the roof rafters. This reflection insulation also has high mechanical properties making it perfect for load bearing applications in construction. Your radiant barrier makes the roof deck sheathing invisible from the attic.

Attics heat up when the sun s radiant energy heats the shingles and the heat is transferred to the interior attic space through the roofing materials via conduction. You are getting a new roof so why not scrape off the shingles put down roofing felt thenradiant barrier foil and thenshingles right on top. The reason is simple when the inside roof deck surface emissivity is lowered from 95 bare wood to a lower value the result is a hotter substrate hence the logic behind the radiant barrier. 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.

The temperature of the attic space increases and that heat is transferred to the building below. It reduces attic temperatures by up to 30 degrees fahrenheit and it blocks up to 97 of radiant heat. Also any water leak will fall onto the backside of the radiant barrier and roll down the slope until it reaches the eaves soffits. Radiant barriers are utilized to reduce summer heat gain in attics.

At first it sounds reasonable. The osb techshield radiant barrier osb is engineered to improve energy efficiency. Radiant barrier under shingles scams bad information foil under shingles will not create a radiant barrier unless there is an airspace on one side of the foil. April 19 2019 posted in.

In these attic space applications there is an air space below the radiant barrier. Placing a radiant barrier directly under the roof decking as illustrated above raises the attic temperature and energy consumption between 2pm and 8pm. If the roofing material is watertight installing the radiant barrier on top of the felt with the batten on top of it would be sufficient. Increasing summer energy consumption and cooling costs.

Some products are fiber reinforced to increase durability and ease of handling. This basically allows for wood rot to continue and inspectors have a more difficult time finding areas of concern.