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Roof Insulations |
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Nailboard™ |
Description
Nailboard is a rigid roof insulation board composed of a closed cell polyisocyanurate foam core bonded in the foaming process to either
7/16" (11 mm) or 5/8" (16 mm) oriented strand board (OSB) on one side and a universal fiber glass reinforced facer on the other.
Application
Nailboard is designed for use as an insulation/nailbase underlayment for a variety of roofing systems and sidewall applications. Nailboard can
be used in new construction, reroofing and residing projects on commercial, industrial and residential buildings. Nailboard made with 7/16"
(11 mm) OSB is used in BUR, modified bitumen and metal roof systems. Nailboard with 5/8 " (16 mm) OSB is used for tile and slate roof
systems.
The OSB incorporated in Nailboard is factory routed 1/8 " (3 mm) on all four sides to allow for required spacing of the OSB sheathing while
maintaining the integrity of the insulation system.
Sizes
Nailboard is available in standard 47½ " x 95½ " (1.21 m x 2.43 m) panels and in thicknesses of 1.5" (38 mm) to 4.0" (102 mm).
Advantages
Thermally Efficient. Nailboard is a highly efficient thermal insulation with high R-value.
Strength. The OSB facer used in Nailboard offers a strong nailable base for application.
Better Handleability. Every Nailboard incorporates a seamless sheet of OSB, which eliminates potential splitting of the panel during roof
loading or handling.
Environmentally Compliant. Complies with EPA requirements and meets Clean Air Act Amendment standards. MANUFACTURED
WITH HCFCs (HYDROCHLOROFLUOROCARBONS). Nailboard is produced with chemicals currently accepted as replacements
in the CFC phase-out process, chemicals that significantly reduce the ozone depletion potential. Nailboard is manufactured with
141b blowing agents using only HCFCs. Nailboard is in compliance with EPA requirements governing all materials produced
after May 15, 1993. Nailboard meets the standards of the Clean Air Act Amendments of 1990.
Thermal Values
The thermal values of Nailboard were determined in accordance with PIMA Technical Bulletin 101 and ASTM C 1289. Recent investigations
have indicated that reduction in foam thermal performance will continue to occur after the PIMA six-month conditioning period. The ultimate
R-value of these products will depend on individual installation circumstances.
When calculating the anticipated thermal performance over the expected life of these products, JM suggests the use of an
R-value of 5.56 per inch of foam thickness (0.98 m2 - °C/W).
Thermal Values
Installation
Tile, Slate, Metal and Membrane Roofing
Nailboard is installed, wood side up, over metal, wood or other structural roof decks. Factory Mutual Approved roof insulation screws (with 2"
[51 mm]) plates for UL 90 wind uplift rated systems) are used to secure Nailboard to the roof deck. Fastener type and size are determined by
the type of roof deck. Consult Johns Manville for recommendations. Wood blocking, equal in thickness to Nailboard, is installed along the
eaves and rake edges of the roof. The roofing system is then installed, according to the manufacturer’s recommendations, to Nailboard.
Vapor Retarder
1. The need for a vapor retarder, as well as type, placement and location of a vapor retarder should be determined by an architect or engineer.
The following situations may require a vapor retarder:
a. Projects where outside average January temperatures below 40°F (4°C) are anticipated and where average winter interior
relative humidity of 45% or greater is expected.
b. Building usages with high humidity interiors, such as:
i. Indoor swimming pools
ii. Textile manufacturing operations
iii. Food, paper plants and other wet-process industrial plants
