Built-Up Roofing Systems
Submittal Data Sheets

Glas Ply^® Premier

Description

GlasPly Premier is a specially constructed, asphalt-coated, fiberglass ply felt for use in hot applied built-up and modified bitumen roofing systems. It is produced by first impregnating a special high strength Johns Manville (JM) fiber glass mat with a quality asphalt.  Next, it is treated with a unique liquid parting agent that eliminates sticking when the felt is unrolled. Before the product is wound into rolls, it is imprinted with laying lines on the top surface so the roofing mechanic can install the felt with the proper exposure and provide the correct number of plies.

Use

GlasPly Premier is intended for use as an integral part of any built-up or modified bitumen roofing system, over nailable and non-nailable roof decks and over approved types of roof insulation.  When installed over nailable decks, a fiber glass base sheet, such as JM GlasBase™, is typically used as the first ply and is usually mechanically fastened to the deck. Subsequently, layers of GlasPly Premier are set in hot asphalt to "build-up" the applicable number of plies. Non-nailable decks and approved insulations usually have multiple layers of GlasPly Premier adhered directly to them with hot asphalt.  GlasPly Premier has good flexibility, conformability, and superior strength in both the machine and cross machine directions.  "Brooming-in" is not necessary, but use of a squeegee on GlasPly Premier after laying in hot asphalt will help ensure full contact is made with the asphalt.

Advantages

• High tensile strength resists splitting that can be caused by roof-top stresses
• Low moisture absorption, excellent dimensional stability and resistance to rot makes it an ideal replacement for organic felt
• Easy to handle, lays flat, minimizes workmanship related problems
• Excellent porosity providing flexibility and conformability, minimizing fishmouths, wrinkling and ridging

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Typical Physical Properties

Material meets the requirements of ASTM D 2178, Type VI.

Breaking Strength (min.) lbf/in. (kN/m)

Longitudinal (With the Fiber Grain).................................60.0 (10.5)
Transverse (Across the Fiber Grain) .............................60.0 (10.5)
Pliability, ½ in (13 mm) Radius Bend ...........................No Failures

Net Dry Mass of Asphalt-impregnated Glass Felt (min.) lbs./100 ft² (g/m²)

Average of All Rolls .............................................................7.0 (342)
Individual Rolls .....................................................................6.0 (293)

Moisture at Time of Manufacture (max.) ............................................1.0%
Mass of Desaturated Glass Felt (min.) lbs./100 ft² (g/m²) ...........1.9 (93)
Bituminous Saturant (Asphalt)  (min.) lbs./100 ft² (g/m²) ...........3.0 (146)
Ash ................................................................................................... 70-88%
Parting Agent and Stabilizer (max.) (min.) lbs./100 ft² (g/m²) .. 3.0 (146)

Refer to the Material Safety Data Sheet and Product Label prior to using this product. For an identical copy of this data sheet ask for RS-2022.  GlasPly Premier is classified by Underwriters Laboratories as a Type G-1 Coated Ply Sheet. See the UL Roofing Materials and Systems Directory for acceptable Class A, B or C roof constructions employing GlasPly Premier. Factory Mutual has approved the use of this product in numerous constructions. Refer to the current edition of the FM Approval Guide for details.

Sizes

Roll size .............................5 squares (46.5 m²)
Roll weight ...............................40 lbs. (18.1 kg)
Roll length .....................................180' (54.9 m)
Roll width ........................................36" (0.92 m)

Glas Ply^® IV

Description

GlasPly IV is a specially constructed ply felt that is formed by coating a JM wet-process fiber glass mat with a light film of asphalt which is then surfaced with a liquid parting agent that prevents sticking in the rolls while providing a clean, easy-to-mop surface. Laying lines are applied on the top surface of the felt so it can be installed with the exposure needed to provide the correct number of plies required by the specification.

Use

GlasPly IV is intended for use as an integral part of any built-up or modified bitumen roofing system, over nailable and non-nailable roof decks and over approved types of roof insulation. When installed over nailable decks, a fiber glass base sheet, such as JM GlasBase™ , is typically used as the first ply and is usually mechanically fastened to the deck. Subsequently, layers of GlasPly IV are set in hot asphalt to "build-up" the applicable number of plies.   Non-nailable decks and approved insulations usually have multiple layers of GlasPly IV adhered directly to them with hot asphalt.  GlasPly IV has good flexibility, conformability, and superior strength in both the machine and cross machine directions.   "Brooming-in" is not necessary, but use of a squeegee on GlasPly IV after laying in hot asphalt will help ensure full contact is made with the asphalt.

A d v a n t a g e s

• Consistent tensile strength and tear resistance
• Controlled porosity allows the product to readily accept hot asphalt and disperse it throughout the entire felt and to stabilize the asphalt after cooling
• Readily accommodates gassing by venting volatile materials and moisture during application
• Low moisture absorption, excellent dimensional stability and resistance to rot makes it an ideal replacement for organic felt
• Easy to handle, lays flat, minimizes workmanship related problems
• Flexibility and conformability minimizes fishmouths, wrinkling and ridging

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Typical Physical Properties

Material meets the requirements of ASTM D 2178, Type IV.

Breaking Strength (min.) lbf/in. (kN/m)

Longitudinal (With the Fiber Grain)...........................44.0 (7.7)
Transverse (Across the Fiber Grain) .......................44.0 (7.7)

Net Dry Mass of Asphalt-impregnated
Glass Felt (min.) lbs./100 ft² (g/m²)

Average of All Rolls ....................................................7.0 (342)
Individual Rolls ............................................................6.0 (293)
Moisture at Time of Manufacture (max.) ..................1.0%

Mass of Desaturated Glass Felt (min.)
lbs./100 ft² (g/m²) ..................................................................1.7 (83)
Bituminous Saturant (Asphalt) [min.]
(min.) lbs./100 ft² (g/m²)........................................................3.0 (146)
Ash .........................................................................................70-88%
Parting Agent and Stabilizer (max.)
lbs./100 ft² (g/m²) .................................................................8.2 (400)

GlasPly IV is classified by Underwriters Laboratories as a Type G-1 Coated Ply Sheet. See the UL Roofing Materials and Systems Directory for acceptable Class A, B or C roof constructions employing GlasPly IV.   Factory Mutual has approved the use of this product in numerous constructions.   Refer to the current edition of the FM Approval Guide for details.

Sizes

Roll size ........................................5 squares (46.5 m²)
Roll weight ..........................................38 lbs. (17.2 kg)
Roll length ................................................180' (54.9 m)
Roll width ...................................................36" (0.92 m)

Refer to the Material Safety Data Sheet and Product Label prior to using this product. For an identical copy of this data sheet ask for RS-2073.

Glas Base™ Plus

Description

GlasBase Plus is an SBS rubber modified, asphaltic base sheet that incorporates the features of a strong fiber glass mat with a coating of blended synthetic rubber and a high quality asphalt.  The modified asphalt blend lends elasticity and flexibility to the product. This coating is designed to help the sheet lay flat in built-up and modified bitumen roofing specifications that require the use of mechanical fasteners on nailable decks. GlasBase Plus employs a unique fiber glass mat to aid in the reduction of wrinkling that can occur in nailed specifications.

Use

GlasBase Plus is designed to be used as a base ply in built-up roofing systems and as a base or intermediate ply in modified bitumen systems. GlasBase Plus may be mechanically attached (to a nailable substrate) or mopped in hot asphalt. Because of its non-porous composition, it can also be used as a ply sheet in cold applied systems that utilize JM MBR^® Bonding Cement or Cold Application Adhesive.

Advantages

• Virtually eliminates wrinkling, resulting in fast, efficient applications
• Fully coated mat, with no pinholes prevents asphalt bleed-through, eliminating splitting problems associated with excessive membrane attachment to nailable decks
• Excellent nail retention properties and resistance to uplift forces
• Low moisture absorption, excellent dimensional stability and resistance to rot make it an ideal replacement for organic base sheets

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Typical Physical Properties

Material meets the requirements of ASTM D 4601, Type I.

GlasBase Plus is classified by Underwriters Laboratories, Inc. as a Type G-2 Coated Base Sheet. See the UL Roofing Materials and Systems Directory for acceptable Class A, B or C roof constructions employing GlasBase Plus. Factory Mutual has approved the use of this product in numerous constructions. Refer to the current edition of the FM Approval Guide for details.

Sizes

Roll size .................................................................... 3 squares (27.9 m²)
Roll weight ...................................................................... 85 lbs. (38.6 kg)
Roll length.......................................................................... 108 ft. (32.9 m)
Roll width ............................................................................ 36 in. (0.92 m)

Refer to the Material Safety Data Sheet and Product Label prior to using this product. For an identical copy of this data sheet ask for RS-2023.

Glas Base™

Description

GlasBase is a true 28 pound, non-porous base sheet that is manufactured by coating a Johns Manville wet-process fiber glass mat with a heavy layer of weathering grade asphalt which is then surfaced with a fine mineral parting agent. GlasBase employs a unique fiber glass mat to aid in the reduction of wrinkling that can occur in nailed specifications.

Use

GlasBase is designed for use as the first ply in built-up and modified bitumen roof assemblies over a variety of nailable roofing substrates. It is ideal for applications where mechanical attachment of the membrane to the roof substrate or deck is desirable.  It is also suitable for use as a ply felt in built-up roofing and modified bitumen systems that employ cold process mastics such as JM MBR^® Cold Application Adhesive.

Advantages

• Resists wrinkling, resulting in fast, efficient application
• Fully coated mat, with no pinholes prevents asphalt bleed-through eliminating splitting problems associated with excessive membrane attachment to nailable decks
• Excellent nail retention properties and resistance to uplift forces
• Low moisture absorption, excellent dimensional stability and resistance to rot make it an ideal replacement for organic base sheets

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Typical Physical Properties

Material meets the requirements of ASTM D 4601, Type I.

GlasBase is classified by Underwriters Laboratories, Inc. as a Type G-2 Coated Base Sheet. See the UL Roofing Materials and Systems Directory for acceptable Class A, B or C roof constructions employing GlasBase. Factory Mutual has approved the use of this product in numerous constructions. Refer to the current edition of the FM Approval Guide for details.

Sizes

Roll size .......................................3 squares (27.9 m 2 )
Roll weight ............................................85 lbs. (38.6 kg)
Roll length ..................................................108' (32.9 m)
Roll width .....................................................36" (0.92 m)

Refer to the Material Safety Data Sheet and Product Label prior to using this product. For an identical copy of this data sheet ask for RS-2014. 

PermaPly^® 28

Description

PermaPly 28 is a light weight, asphalt-coated, fiber glass base felt.  It is manufactured by coating a Johns Manville wet process fiber glass mat with a weathering grade asphalt and then surfaced with a fine mineral parting agent.  PermaPly 28 is well suited as a replacement for coated organic base felts, as the fiber glass (inorganic) mat reinforcement is rot resistant and has low moisture absorption.

Use

PermaPly 28 is designed for use as the first or base ply in built-up and modified bitumen roof assemblies. It is ideal for applications where mechanical attachment of the membrane to the roof substrate or roof deck is desirable. PermaPly 28’s asphalt coating makes it suitable for use as an intermediate or ply felt in cold applied built-up and modified bitumen roof assemblies.

Advantages

• Easy to handle and lays fast
• Exceptional pliability
• Low moisture absorption, excellent dimensional stability and resistance to rot make it an ideal replacement for organic base sheets

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Typical Physical Properties

Material meets the requirements of ASTM D 4601, Type II.

Breaking Strength (min.) lbf/in. (kN/m)

Longitudinal and Transverse ....................................... 44.0 (7.7)
Moisture at Time of Manufacture (max.) ............................ 1.0%

Mass of Desaturated Glass Felt (min.)

lbs./100 ft² (g/m²) ............................................................. 1.7 (83)

Surfacing and Stabilizer (max.) ...................................................... 65%
Asphalt (min.) lbs./100 ft² (g/m²) ...............................................7.0 (342)
Ash (Glass Mat Only) .................................................................. 70-88%

PermaPly 28 has been evaluated and approved for use in a variety of fire-rated constructions and is classified by Underwriters Laboratories, Inc. as a Type G-2 Coated Base Sheet and by Factory Mutual Research Corporation for use in approved FM constructions.  Consult the current UL Roofing Materials and Systems Directory and the FM Approval Guide for specific constructions.

Sizes

Roll size .................................................................... 3 squares (27.9 m²)
Roll weight ...................................................................... 75 lbs. (34.0 kg)
Roll length ............................................................................ 108' (32.9 m)
Roll width ................................................................................36" (0.92 m)

Refer to the Material Safety Data Sheet and Product Label prior to using this product. For an identical copy of this data sheet ask for RS-2016.

Ventsulation^® Felt

Description

Ventsulation Felt is a specially constructed, heavy-duty, asphalt-coated fiber glass venting base sheet for use in hot applied built-up and modified bitumen roofing systems. It is composed of a Johns Manville fiber glass mat with a quality coating asphalt and a coarse mineral surfacing on one side. The mineral surfacing has a 1" (25 mm) grid waffle pattern embossed into it, which promotes underside venting.

Use

Ventsulation Felt may be used as a base sheet for any built-up or modified bitumen roof system to be installed over a substrate that potentially contains moisture. Examples of these types of substrates are existing roof membranes that are to be recovered, as opposed to being removed, and lightweight insulating fill or gypsum decks. The embossed channels provide a means for venting vapor pressure that can build-up under membranes that have been placed over substrates with high moisture levels. If the moisture (vapor pressure) cannot escape, serious damage can result.  When installing Ventsulation, the embossed waffle pattern is always placed facing down and is to be in contact with the old membrane or wet fill decking material.

Advantages

• Helps prevent blistering of asphalt-based roofs installed over potential moisture-containing substrates
• Provides a means of venting moisture vapor that can build up within a roof system
• Low moisture absorption, excellent dimensional stability and resistance to rot make it an ideal replacement for organic base sheets

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Typical Physical Properties

Material meets the requirements of ASTM D 4897, Type II.

Sizes

Roll size ............................................................1 square (9.29 m²)
Roll weight ........................................................... 79 lbs. (35.8 kg)
Roll length ........................................................................36' (11 m)
Roll width ..................................................................... 36" (0.92 m)

Refer to the Material Safety Data Sheet and Product Label prior to using this product. For an identical copy of this data sheet ask for RS-2020.

GlasTite^® Flexible

Description

GlasTite Flexible is a durable, built-up roofing flashing felt designed around a unique reinforcing system. The reinforcing fabric has a "balanced" construction formed by laminating a polyester mat to each side of a tough fiber glass scrim core. This exceptional reinforcement mat is subsequently coated with a proven and durable weathering grade asphalt. The composite is then surfaced on both sides with a fine mineral parting agent.  The design of this reinforced base flashing offers exceptionally high tensile strength and tear resistance. These properties facilitate application and increase service life.

Use

GlasTite Flexible is used in the construction of traditional flashing systems on built-up roofs. It readily conforms to transitions at the cant and wall area. Unlike flashing products reinforced with traditional fiber glass mats, which can exhibit strong memory, GlasTite Flexible does not bridge at the cant and will not pull away from the substrate after it has been installed. Its flexibility makes it ideal for all roof terminations, including parapet walls, skylights, roof penetrations, drains, vents and roof edges.  GlasTite Flexible is installed using slightly different procedures than conventional fiber glass mat base flashings. Back mopping the sheet and the substrate to which it will be installed results in the best installation. As an alternate, GlasTite Flexible can be set in Bestile^® Industrial Roof Cement, JM MBR^® Utility Cement or JM MBR^® Flashing Cement in three or five course base flashing systems.

For guaranteed systems, JM requires that GlasTite Flexible be surfaced with a JM roof coating.

Advantages

• Excellent puncture and tear resistance prevent damage often caused by roof-top traffic
• Superior flexibility and conformability allow the mechanic to easily and quickly install a tight, durable flashing system
• Extraordinary tensile strength provides superior protection against splitting
• Low moisture absorption, excellent dimensional stability and resistance to rot make it an ideal replacement for organic flashing materials

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Typical Physical Properties

Tensile Strength (ASTM D 146) ........................ 133 lbf/in. (23.3 kN/m)
Tear Resistance (ASTM D 689)

Machine Direction........................................................ 2610 grams
Cross Machine Direction .............................................3910 grams

Puncture Resistance (ASTM D 781) .................. 42 inch- lbs. (4.7 N-m)

Sizes

Refer to the Material Safety Data Sheet and Product Label prior to using this product. For an identical copy of this data sheet ask for RS-2025.

GlasKap^®

Description

GlasKap is a mineral surfaced, asphalt coated, fiber glass cap sheet for use in hot applied built-up roofing systems. It is composed of a Johns Manville fiber glass mat with a high quality coating asphalt and a white ceramic-coated granule surfacing on the side to be exposed to the weather.

Use

GlasKap is used as the uppermost finish ply in a variety of built-up roofing systems. The ceramic-coated granule surfaced sheet provides protection to the underlying asphalt and membrane, as well as the benefit of a reflective surface when white granules are used.  When installing GlasKap, it is important that the mopping asphalt be at the appropriate temperature: 20°F (-7°C) above the asphalt’s EVT is recommended.

Advantages

• Low moisture absorption, excellent dimensional stability and resistance to rot make it an ideal replacement for organic cap sheets
• When white granules are requested, the reflective surface can provide energy savings
• Low maintenance compared to roofs that use coatings
• Should the roof be damaged, repairs are easy to make

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Typical Physical Properties

Material meets the requirements of ASTM D 3909.

GlasKap is classified by Underwriters Laboratories as a Type G-2 Coated Cap Sheet. See the UL Roofing Materials and Systems Directory for acceptable Class A, B or C roof constructions employing GlasKap. Factory Mutual has approved the use of this product in numerous constructions. Refer to the current edition of the FM Approval Guide for details.

Sizes

Roll size ........................................................................ 1 square (9.29 m²)
Roll weight ...................................................................... 72 lbs. (32.7 kg)
Roll length .................................................................................. 36' (11 m)
Roll width ................................................................................ 36" (0.92 m)

Refer to the Material Safety Data Sheet and Product Label prior to using this product. For an identical copy of this data sheet ask for RS-2019.