Roof cover boards can be installed over the insulation and under the roofing membrane. Their primary function is to protect, separate and support the roof membrane.

Roof cover board products function as a fire- and water-resistant substrate in new or reroof applications. They may be used with single-ply, fluid applied, built-up, spray foam, modified bitumen and standing seam metal roofing systems. In addition to providing protection for the insulation, a roof cover board can dramatically enhance fire, wind, and mold and moisture resistance, as well as add compressive strength to the entire roofing system.

Roof cover board products are extremely versatile and can be used in a variety of applications. Their key benefits include the following:

Protection and Support
With the roof board placed directly below the roofing membrane, it provides the primary support for the membrane and underlying insulation layer. The roof board also protects the insulation.

Substrate for Vapor Retarders
Here, the roof board is fastened directly to the deck and the membrane may be loose laid; attached with cold mastics, hot asphalt or adhesives; or mechanically fastened, depending on the system requirements.

Hot Mop
The roof board can be mechanically fastened, bonded with mastic or adhesives or hot mopped to foam insulation. All hot-applied roofing systems can then be mopped directly onto the unprimed roof board.

Metal or Tile Roof Thermal Barrier
The roof board provides a thermal barrier in conjunction with a standing seam metal or tile roofing system. It also provides noise reduction and hail resistance.

Roof Recover Board
The roof board is placed over the existing membrane surface, where it functions as a separator and a support layer between the old roof and the new roofing membrane.

Thermal Barrier
When installed directly to a metal deck, the roof board provides a thermal barrier for both expanded and extruded polystyrene insulation.

Fire Barrier Underlayment
The roof board can be used as a barrier board underlayment below optional rigid foam insulation on a combustible deck to achieve a Class A, B or C fire-resistance rating.