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Vent-Top Nailbase Insulation
Cornell Corp.
Cornell Corp. offers Vent-Top ThermaCal® - an improved nail base roof insulation with a built in ventilated air space. Shingles, shakes or metal roofing are installed over the installation.
  • Two layers of oriented strand board sheathing.
  • 95% open air space for ventilation. Air flow in all directions.
  • Edges of sheathing cut back to allow for expansion.
  • Isocyanurate foam insulation.
  • Used over structural deck - steel, wood, concrete, etc.
Johns Manville
Nailboard is designed for use an insulation/nailbase underlayment for a variety of roofing systems and sidewall applications. Nailboard can be used in new construction, reroofing and re-siding projects on commercial, industrial and residential buildings.
Its rigid roof insulation board is composed of a closed-cell polyisocyanurate foam core and bonded in the forming process to either 7/16" (11mm) or 5/8" (16mm) oriented strand board on one side and a universal fiber glass reinforced facer on the other. Nailboard meets the physical property requirements of ASTM C 1289 and Federal Specification HH-I-1972/Gen and HH-I-1972/2.
Glu-Lam Beams, Treated Glulams, Cedar Glulams® | Parallam® Beams | LVL Beams and Headers
Timbers and Long Length Dimension | I-Joist | Trim-JoistTM | Roof Decking
Nailbase Insulation | Scaffold Plank | Real Post


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