Recovered Materials

be mechanically fastened. Check individual

manufacturer requirement prior to application.

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[e.

Polystyrene Board:

Shall be in accordance with ASTM C 578, Type

II, IV, or X.]

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NOTE: Specify high density type wood fiberboard

where the board is used as an overlayment and

fully-adhered single-ply roofing is specified.

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NOTE: Grade 1 insulating board is primarily for use

under built-up roof systems. Grade 2 board is

primarily for use under single-ply roof systems.

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[f.

Wood Fiberboard: ASTM C 208[, high density], except 4 by 4 feet

maximum board size.

ASTM C 208 Type II, Grade 1 or 2, roof insulating board, treated with

sizing, wax or bituminous impregnation. Bituminous impregnation shall be

limited to 4 percent by weight when used over steel decks. Maximum board

size: 4 feet by 4 feet.]

2.1.2

Mineral-Fiber Insulation Board

ASTM C 726.

2.1.3

Recovered Materials

Provide thermal insulation materials containing recycled materials to the

extent practical. The required minimum recycled material content for the

listed materials are:

Perlite Composition Board:

23

percent

postconsumer paper

Polyisocyanurate/polyurethane:

9

percent

recovered material

Phenolic Rigid Foam:

5

percent

recovered material

Wood Fiberboard

[ ]

percent

recovered material

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NOTE: Whenever possible, provide insulation which

has a minimum of 4 percent post consumer waste or 20

percent recycled material by weight of installed

products as defined by (NIBS) September 1999.

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2.1.4

Insulation Thickness

As necessary to provide a thermal resistance (R value) of [_____] or more

[for average thickness of tapered system]. Thickness shall be based on the

"R" value for aged insulation. [Insulation over steel decks shall satisfy

both specified R value and minimum thickness for width of rib opening

recommended in insulation manufacturer's published literature].

SECTION 07220

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