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Vent-Top Thermacal and Vent-top Thermacal X are composite ventilated roof insulation panels combining (standard) OSB sheathing, an air space made by solid wood spacers, and polyisocynurate or extruded polystyrene respectively. The standard 1" vent space layout leaves over 92% open vent area for maximum airflow. 7/16" O.S.B. is standard and 5/8" or 3/4" O.S.B. or plywood and fire/pressure treated sheathing is available for special applications. Vent-Top Thermacal = "The Original Ventilated Roof Insulation", performing on roofs all over America since 1987!

• The largest vent cross section available-
  10 sq.in. per ft. run
• Over 86% open for up the slope ventilation
• Over 50% open area for lateral ventilation
• Allows air flow in all directions to give improved cooling and ventilation throughout
  the roof area, especially at hips and valleys

• Over 92% open area - spacers occupy only 8% of panel area
• Solid wood spacers less than 12" apart in both directions to minimize deflection of top sheathing
• Sheathing is pre-spaced for thermal expansion

• Perfect for Cathedral Ceilings, Glue Lam and Post & Beam structures.
• Ideal solution for a conditioned attic space to protect HVAC and sprinkler systems
• Reroofing applications
• Viable in green and sustainable building designs
  

• Provides insulating value while ventilating the roof assembly
• Cools shingles in hot weather, allows moisture to escape
• Reduces snow melt in winter due to cold roof surface, retarding ice dam formation
• Satisfies the standard or extended warranty requirements of many shingle products
• Machined panels fit tight, minimizing heat loss
• Helps you get the most value form your roofing investment