Of the ceiling insulation to allow ventilation air to flow between the roof decking and the top surface of the radiant barrier, and have a minimum of six (6) inches (measured horizontally) left at The radiant barrier (except for radiant barriers laminated directly to the roof deck) shall be installed to have a minimum gap of 3.5 inches between the bottom of the radiant barrier and the top The material should be cut to allow for full airflow to the venting. Ridge vents or gable end vents are recommended to achieve the best performance. Provide no less than 30 percent upper vents.Provide a minimum free ventilation area of not less than one square foot of vent area for each 150 sf of attic floor area.Conform to the radiant barrier manufacturer's instructions.The radiant barrier shall be installed to cover all gable end walls and other vertical surfaces in the attic. The radiant barrier shall be laminated and perforated by the manufacturer to allow moisture/vapor transfer through the roof Attached (laminated) directly to the underside of the roof decking.A minimum air space shall be maintained between thetop surface of the radiant barrier and roof decking of not less thanġ.5 inches at the center of the truss/rafter span. Secured (stapled) to the bottom surface of the truss/rafter (top chord).Spanning between the truss/rafters (top chords) and secured (stapled) to each side.Draped over the truss/rafter (the top chords) before the upper roof decking is installed.Other methods of installing a Title 24 compliant radiant barrier include: The sheathing is installed with the radiant barrier (shiny side) facing down toward the attic space. Oriented strand board (OSB) is the most common materialĪvailable with a factory-applied radiant barrier. The most common way of installing a radiant barrier is to use roof sheathing that has a radiant barrier bonded to it in the factory. The performance approach does not require a radiant barrier in any climate zone. The Title 24 prescriptive compliance approach requires a radiant barrier in climate zones with significant cooling
Gain to air distribution ducts and insulation located below the radiant barrier. A radiant barrier is a reflective material located in an attic beneath the roof deck that reduces radiant heat transfer caused by solar heat gain in the roof.
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