ACFoam CrossVent RB improves the thermal efficency of standard CrossVent by including a radiant barrier on the underside of the OSB nailing surface. It consists of a polyiso insulation board with 1.0", 1.5" or 2.0" vent spacer strips separating 7/16" APA/TECO rated radiant barrier OSB from the polyiso foam insulation to create a cross-ventilating air space.The radiant barrier diminishes heat transfer, and the spacer strips allow air to flow through the air space, thereby reducing radiant heat transfer, helping to futher dissipate heat build-up beneath the OSB. CrossVent RB is made to order in 4´ x 8´ (1220mm x 2440mm) size panels and in normal thickness of 2.5" to 6.5". Non-standard vent spaces are available on special order.  Long Term Thermal Resistance (LTTR) Values & Thicknesses  Typical Physical Properties (Foam Portion)  Net Free Area of Ventilation Per Linear Foot

CODES & COMPLIANCES Federal Specification HH-I-1972/GEN has been cancelled ASTM C 1289, Type V Miami-Dade County, Florida Product Control No. 00-0208.04 (with 19/32" plywood) State of California, License #TC 1231 IBC, NBC, UBC and SBC Sections on Foam Insulation (Chapter 26).  FHA minumum property requirements ARMA insulated deck requirements APA/TECO rated OSB nailable surface FM Standard 4450/4470 Approval (1-105, 1-90, 1-60) ACFoam CrossVent RB Insulation is approved for Class 1 insulated roof deck construction. Refer to FM Approval Guide for details. UL Standard 1256 Classification Insulated metal deck construction assemblies - Construction #120 and #123. UL Standard 790 Classification (ASTM E108) For use with Class A, B or C shingles, metal or tile roof coverings. UL Standard 263 Fire Resistance Classification (ASTM E119) Some classifications for fire resistance are P225, P230, P259, P508, P510, P514, P701, P717, P719, P723, P728, P732, P734, P739, P801, P815, and P819. See UL Fire Resistance Directory. CrossVent RB is covered by one or more claims of Patent #5,433,050. Spec this Product   Net Free Area of Ventilation Per Linear Foot	RECOMMENDED USES ACFoamCrossVent and CrossVent RB have been designed for use over sloped unventilated roof decks. Slopes must be appropriate for the type of roof system specified. The primary purpose of CrossVent and CrossVent RB is to provide a thermally efficient insulation with uniform cross venting that promotes air circulation required by many shingle manufacturers.CrossVent and CrossVent RB allow heat to dissipate while providing a nailable surface and efficient insulation in a one-step labor saving process. Note: Ventilation design is solely the responsibility of the project designer. Designer should consider size of air space,ventilation capabilities of soffit and ridge vents,and length of run,among possible considerations. Atlas recommends a staggered double-layer of ACFoam-II and CrossVent or CrossVent RB for additional energy savings.
WARRANTY In response to valid concerns of building designers regarding thermal efficiency of roof assemblies and the long-term insulating value of roof insulation, Atlas offers a 20-year, limited thermal warranty. The "ACFoam" Limited Warranty places Atlas ACFoam products above all others and supports the building owner, designer and contractor by backing up thermal performance. This warranty is available to the building owner at the time the building is completed and is transferable to any subsequent owner for the duration of the 20-year period. 20 Year Limited Warranty	INSTALLATION Atlas Roofing CrossVent RB General Installation Instructions Atlas recommends a staggered double layer application of ACFoam-II as the first layer and CrossVent or CrossVent RB as the top layer.This application will improve thermal performance and limit moisture and airflow through the roof system.Atlas CrossVent or CrossVent RB should be installed directly over the vapor/air retarder that has been applied over the approved substrate. CrossVent or CrossVent RB should be installed with the 8 ft.dimension parallel to the eave and with the vent spacer strips running up the slope of the roof. CrossVent or CrossVent RB shall be fastened directly through the vent spacer strips in accordance with fastening patterns contained in the Atlas publication, Guide Details (Current Edition) for Nail Base and CrossVent Insulation.   Complete Instructions
STORAGE Storage/Precautions: Factory-applied packaging is intended only for protection during transit. When stored outdoors or on the job site, packages should be stacked on pallets at least four inches above ground level and completely covered with a weatherproof covering such as a tarpaulin. The temporary factory-applied packaging should be slit or removed to prevent accumulation of condensation. Roof insulation which has become wet or damaged should be removed and replaced with solid, dry insulation. Warning! Do Not Leave Exposed: This product is a polyiso organic plastic foam and will burn if exposed to an ignition source of sufficient heat and intensity, or open flame, such as a welder´s torch. Like other organic materials, this product will release smoke if ignited. Do not apply flame directly to ACFoam roof insulations. This product should be used only in strict accordance with Atlas recommended uses and application instructions.	SALES OFFICES Camp Hill East Moline Northglenn LaGrange Diboll Phoenix Toronto Sales Offices

Features & Benefits

ACUltra Technology means ZERO HCFC´s

Excellent
R-values reduce energy demand

Superior performance in fire tests

Approved for installation directly on the roof deck without a thermal barrier

Cost-effective, environmentally friendly solution for any roof