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Product Information Sheet
M68 Glas RubrCap
SEBS White Glass Cap Sheet

USES: M68 Glass RubrCap is used as a mineral glass cap membrane in the construction of built-up roofing and waterproofing membranes. These membranes form a water shield over such structures as roofs, foundations, and decks.

DIRECTIONS: Store M68 Glass RubrCap on end. Keep protected from damage and humidity. To install base sheets with Glass RubrCap, the substrate is required to be firm, clean, dry, and smooth. Use any of the following as a base sheet: M60 RubrPoly, M64 RubrPoly2, F50 PolyShield, F55 PolyShield2, M62 RubrGlas, M66 RubrGlas2, or F52 GlasBase2. Apply the base sheet so that the flow of water is over or parallel to the seams. Lap the base sheet 2" on the side laps and a minimum of 4" on the end laps. Extend the base sheet to the head of all cants. Secure the base sheet to the substrate by either nailing or adhering. For nailed base sheets, use nails with 1" heads and nail the base sheet 9" on center, on both the outside edges and the seams. Also, nail two rows 12" in from each edge on 18" centers, and alternate the nails in each row so that they are offset from each other. For adhered base sheets, apply either Fields hot asphalt or ambient asphalt and lightly broom the base sheet into the asphalt as it is unrolled. For hot asphalt installations, apply either MT3 RubrPac or T3 MeltPac at the rate of 25 lbs per 100 square feet. For ambient asphalt installations, use either M150 RubrSeal, M100 RubrCoat, or F100 PowrCoat at the rate of 5 gallons per 100 square feet. Install an extra base sheet in valleys and waterways. This extra sheet shall extend at least 8" up the inclines of valleys and be applied as specified for adhered base sheets. To install ply sheets with Glass RubrCap, the base sheet or substrate is required to be firm, clean, dry, and smooth. Apply any one of the following as the ply sheets: M60 RubrPoly, M64 RubrPoly2, F50 PolyShield, F55 PolyShield2, M62 RubrGlas, M66 RubrGlas2, F52 GlasBase2, F56 GlasPly6, or F54 GlasPly4. Install the ply sheets parallel to the base sheet so that the flow of water is over or parallel to the seams. Apply 1, 2, or 3 ply sheets in shingle fashion on the correct laylines. Start by cutting and installing the starter strips and continue by installing the ply sheets in a uniform interply application of either MT3 RubrPac or T3 MeltPac hot asphalt at the rate of 25 lbs per ply sheet per 100 square feet: Or apply M150 RubrSeal, M100 RubrCoat, or F100 PowrCoat ambient asphalt at the rate of 5 gallons per ply sheet, per 100 square feet. Make end laps a minimum of 4". Adjacent end laps shall be offset at least 12" apart. Lightly broom the ply sheets into the asphalt as they are unrolled. To install the cap sheet with Glass RubrCap, the ply sheets are required to be firm, clean, dry, and smooth. Adhere an extra base flashing strip on all flashings at the same rate of asphalt as required for adhering base sheets. Extend the extra base flashing a minimum of 2" above the head of the cants and a minium of 4" beyond the toe of the cants. Then, use any one of the following as an adhesive to secure the Glass RubrCap: MT3 RubrPac, T3 MeltPac, M150 RubrSeal, M100 RubrCoat, F100 PowrCoat, M700 RubrGard, or F700 PowrGard. For hot asphalt coatings, apply 25 lbs per 100 square feet. For ambient asphalt coatings, apply 5 gallons per 100 square feet.

DESCRIPTION: M68 Glass RubrCap is an asphalt coated fiberglass sheet. Select raw materials have been formulated into an SEBS mineral glass cap membrane. Glass RubrCap protects from weather, acid rain, ozone, and chemicals. The SEBS rubber in Glass RubrCap provides maximum elastic performance against thermal shock, the daily expansion and contraction of a membrane caused by temperature changes. Membranes made weak from the assault of thermal shock cycles begin to break apart. Glass RubrCap is your best defense against these attacks. With Glass RubrCap, your roofing and waterproofing membranes will perform much longer. Glass RubrCap has an Underwriters Laboratories (UL) Class A Fire Rating when installed in specified systems.

SPECIFICATIONS: M68 Glass RubrCap exceeds the standards of the American Society for Testing and Materials ASTM D 6163 Grade G.

PHYSICAL PROPERTIES:
Number of Rolls Per Pallet 20
Roll Dimensions and Size 36" x 36' = 108 sf
Typical Finished Roll Weight 99 lbs
Thickness min. mils 95
Net mass/unit area, min lbs/100 sf 65
Max load at 0°F, md and xmd, min, lbf/100 sf 70
Elongation at 0°F md and xmd, min % 1
Max load at 73.4°F, md and xmd, min, lbf/100 sf 30
Elongation at 73.4°F md and xmd, min % 2
Tear strength at 73.4°F, min, lbf 35
Low temp flex, max, °F 0
Compound stability at 215°F No failures
Granule embedment, max loss, g 2

 

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