Radiant Barrier On Top Of Roof Decking

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.

Radiant barrier on top of roof decking.

This basically allows for wood rot to continue and inspectors have a more difficult time finding areas of concern. Radiant barriers are utilized to reduce summer heat gain in attics. The osb techshield radiant barrier osb is engineered to improve energy efficiency. Also any water leak will fall onto the backside of the radiant barrier and roll down the slope until it reaches the eaves soffits.

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. Increasing summer energy consumption and cooling costs. Installed in over 1 5 million homes in the united states lp techshield panels also lower attic temperatures up to 30 f. At first it sounds reasonable.

Some products are fiber reinforced to increase durability and ease of handling. In these attic space applications there is an air space below the radiant barrier. 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. This reflection insulation also has high mechanical properties making it perfect for load bearing applications in construction.

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. The temperature of the attic space increases and that heat is transferred to the building below. Your radiant barrier makes the roof deck sheathing invisible from the attic. April 19 2019 posted in.

This allows the radiant barrier to remain dry while also achieving the 3 4 air space requirement. Placing a radiant barrier directly under the roof decking as illustrated above raises the attic temperature and energy consumption between 2pm and 8pm. But on the bright side. Radiant barriers consist of a highly reflective material usually aluminum foil which is applied to one or both sides of a number of substrate materials such as kraft paper plastic films cardboard oriented strand board and air infiltration barrier material.

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. 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.