Karnak Corporation has manufactured roof coatings, cements, and sealants since 1933 and remains family-owned and certified as a woman-owned business today. The catalog covers reflective roof coatings, roof cements, silicone sealants like 671 Karna-Seal, elastomeric products such as Karna-Flex for metal roof seams, and repair fabrics and tapes — all built for maintaining and restoring commercial flat and low-slope roofs.
Who Is Karnak and Where They Fit in Roofing
Karnak has been making roof coatings and cements since 1933, operating out of Clark, New Jersey for most of its history. It's still family-owned today and holds certification as a woman-owned business — a long track record for a company whose products are built around repair, restoration, and maintenance rather than new construction.
Karnak serves architects, specifiers, contractors, distributors, and building owners across the U.S. and internationally, with warranties on individual products ranging from five to twenty years depending on the system specified.
Detail-First Sealants
671 Karna-Seal is a single-component, moisture-curing 100% silicone sealant built for UV resistance and long-term flexibility at seams and penetrations.
Metal Roof Specialist
Karna-Flex is an elastomeric sealant formulated specifically for the seams, fasteners, and flashing details where metal roofs most often start to leak.
Flexible Packaging
Key products like 671 Karna-Seal now ship in 2-liter pouches and 10.1-ounce caulk tubes alongside standard 2.5-gallon buckets, matching package size to job size.
Product Lineup
- Reflective Roof Coatings — including 71 Fibered Asphalt Roof Coating
- Roof Cements & Sealants — 671 Karna-Seal silicone sealant, general-purpose cements
- Karna-Flex 502MS — rubberized thermoplastic sealant for metal roof seams and fasteners
- Fabrics & Repair Tapes — reinforcement for coating and patch applications
- Damp-Proofing & Elastomeric Products — waterproofing beyond the roof plane
Where It Fits on the Job
Karnak splits its catalog roughly between field material — asphalt coatings, emulsions, elastomeric coatings, and reflective aluminum coatings applied across the full roof plane — and detail material used at seams, fasteners, and flashings. On exposed-fastener and standing-seam metal roofs especially, leaks tend to start at the joints rather than the panel field, which is why Karnak recommends specifying a coating and its matching sealant together rather than coating alone.
Warranty length varies by specific Karnak product and system. Confirm the product data sheet and stock at your branch with our counter team before finalizing a spec — products vary by location.
FAQ
Is Karnak better for metal roofs or flat commercial roofs?
Karnak serves both. Karna-Flex is built specifically for metal roof seams and fasteners, while the reflective coatings and cements target low-slope and flat commercial roof restoration.
What warranty does Karnak offer?
Warranties range from five to twenty years depending on the specific product and system installed. Check the product data sheet for the exact coverage on the line you're specifying.
Is Karnak stocked at Murphy's?
Yes. Karnak is one of Murphy's stocked manufacturer lines. Ask our counter team which Karnak products and package sizes are on hand at your location.
