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Karnak 78 Cold Process Cement Bituminous Adhesive Sealant, Black, 5 Gallon
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Karnak 78 Cold Process Cement Bituminous Adhesive Sealant, Black, 5 Gallon
Karnak 78 Cold Process Cement is a black, bituminous-based adhesive sealant designed for applying and repairing rolled roofing and bituminous single-ply membranes. One unit is a 5-gallon pail applied at 2 to 3 gallons per 100 sq. ft. It adheres the membrane and seals laps to prevent water intrusion, and works with Karnak Cold Process Roofing Systems such as P-21 and P-22.
Key Features:
- Adheres and seals: Adheres the membrane and seals the laps to prevent water intrusion when properly utilized.
- Cold process: Bituminous-based adhesive sealant requiring no heating for application and repair of rolled roofing membranes.
- System compatible: Can be used with Karnak Cold Process Roofing Systems such as P-21 and P-22.
- Works with felts: Also compatible with other manufacturers' coated fiberglass felts and base sheets.
- Repair capable: Suitable for both new application and repair of rolled roofing bituminous single-ply membranes.
Specifications Table:
| Specification | Details |
|---|---|
| Brand | Karnak |
| Sell unit | 1 pail, 5 gal |
| Product line | Karnak 78 |
| Material | Bituminous-based adhesive sealant |
| Color / finish | Black |
| Nominal size | 5 gal pail |
| Application rate | 2 to 3 gallons per 100 sq. ft. |
| Intended use | Application and repair of rolled roofing bituminous single-ply membranes; cold process roofing systems |
| System compatibility | Karnak Cold Process Roofing Systems (P-21, P-22), other manufacturers' coated fiberglass felts and base sheets |
Coverage & How Much You Need:
Apply at 2 to 3 gallons per 100 sq. ft.; one 5-gallon pail therefore covers roughly 165 to 250 sq. ft depending on application rate.
Fit and Compatibility:
Use with Karnak Cold Process Roofing Systems (P-21, P-22) or with other manufacturers' coated fiberglass felts and base sheets. Confirm substrate condition and temperature range before application.
Frequently Asked Questions (FAQ):
Q: What is included?
A: One sell unit is a 5-gallon pail of Karnak 78 Cold Process Cement in black.
Q: How much area does one pail cover?
A: At the stated rate of 2 to 3 gallons per 100 sq. ft., a 5-gallon pail covers roughly 165 to 250 sq. ft.
Q: What is it used for?
A: Applying and repairing rolled roofing bituminous single-ply membranes; it adheres the membrane and seals laps against water intrusion.
Q: Can it be used in full roof systems?
A: Yes, it can be used with Karnak's Cold Process Roofing Systems such as P-21 and P-22, or with other manufacturers' coated fiberglass felts and base sheets.
Q: Does it need heating?
A: No, it is a cold process cement applied without heating.
Q: What color is it?
A: Black.
Expert Verdict — Reviewed by the SuperArbor Pro Desk
Karnak 78 is a go-to cold-applied adhesive for laps and repairs on rolled roofing and single-ply bituminous membranes when hot asphalt or torch work is not practical. Spread it at the stated 2 to 3 gallons per 100 sq. ft. rate, embed the membrane while the cement is still workable, and roll or press laps firmly to eliminate voids. Verify substrate is dry and clean so the bituminous bond can develop fully.
Bituminous cements contain solvents; use in ventilated conditions, follow the safety data sheet, and keep ignition sources away during application.
Order Karnak 78 Cold Process Cement in the 5-gallon pail for membrane application and lap sealing.
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