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Product Information Sheet
F58 GlasCap
White Glass Cap Sheet

USES: F58 GlasCap is used as a mineral cap sheet in the construction of built-up roofing and waterproofing membranes. These membranes form a water shield over such structures as roofs, foundations, and decks.

DESCRIPTION: F58 GlasCap is an asphalt coated fiberglass sheet. Select raw materials have been formulated into a mineral surface cap sheet. GlasCap is your best defense against attacks from weather, acid rain, ozone, and chemicals. With GlasCap, your roofing and waterproofing membranes will perform much longer. GlasCap has an Underwriters Laboratories (UL) Class A Fire Rating when installed in specified systems.

DIRECTIONS: Store F58 GlasCap on end. Keep protected from damage and humidity. Install base sheets with GlasCap, 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, M62 RubrGlas, M66 RubrGlas2, F52 GlasBase2, or F55 PolyShield2. 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. 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. Adhered base sheets, apply either Fields hot asphalt or ambient asphalt and lightly broom the base sheet into the asphalt as it is unrolled. Hot asphalt installations, apply either MT3 RubrPac or T3 MeltPac at the rate of 25 lbs per 100 square feet. 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. Install ply sheets with GlasCap, 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, M62 RubrGlas, M66 RubrGlas2, F56 GlasPly6, F52 GlasBase2, F54 GlasPly4, or P55 PolyShield2. 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. Install the cap sheet with GlasCap, 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 minimum of 4" beyond the toe of the cants. Then, use any one of the following as an adhesive to secure the GlasCap: MT3 RubrPac, T3 MeltPac, M150 RubrSeal, M100 RubrCoat, or F100 PowrCoat. For hot asphalt coatings, apply 25 lbs per 100 square feet. For ambient asphalt coatings, apply 5 gallons per 100 square feet.

SPECIFICATIONS: F58 GlasCap exceeds the standards of the American Society for Testing and Materials ASTM D 3909.

TYPICAL TEST DATA:
Number of Rolls Per Pallet 30
Roll Dimensions and Size 36" x 36' = 108 sf
Typical Finished Roll Weight 72 lbs
Moisture % max time of manufacture 1.0
Mass of desaturated glass mat min (lb/100 ft) 1.7
Ash % (glass mat only) 70 to 88
Mass per unit area of granule-surfaced sheet min (lb/100 ft2) 63.2
Mass per unit area of desaturated glass sheet min (lb/100 ft2) 1.7
Mass per unit area of mineral matter passing a 3.35-mm (No. 6)
sieve and retained on a 212-um (No. 70) sieve min (lb/100 ft2)
24
Mass of mineral matter passing a 212-um (No. 70) sieve based
on the mass of the coating asphalt and the mineral matter passing
the 212-um (No. 70) sieve max %
55

PHYSICAL REQUIREMENTS:
Pliability (1/2 in) radius maximum failures, 10 specimens 0

 

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