Let Henry^® simplify your next membrane installation with Henry Low-VOC Water Cut-Off Mastic. Low-VOC Water Cut-Off Mastic is a one-component, low-viscosity, self-wetting, butyl-blend mastic designed to be used in conjunction with roofing and waterproofing systems. It is primarily used as a sealing agent between various membranes and is applicable when the membrane is being terminated using a compression-type seal.

Low-VOC Water Cut-Off Mastic is an extremely tacky material and will remain as such when used with compression-type terminations.

This product meets the <250 g/L VOC content requirement of the SCAQMD 1168 Model Rule for Sealants which complies with the following California counties’ VOC regulations: Alameda, Contra Costa, El Dorado, Los Angeles, Marin, Napa, Orange, Riverside, Sacramento, San Bernardino, San Diego, San Francisco, San Mateo, Santa Clara, Solano, Sonoma and Tehama. 

Features and Benefits

• Extremely tacky
• Provides a durable compression-type seal between various membranes and parapet wall constructions
• SCAQMD 1168 Compliant

Size available

• 11 fl. oz. cartridge

Color available

• Gray

Complete the system

Lap Sealant - EPDM & TPO

Single-Ply Sealant - EPDM & TPO

• Installation and Technical Literature

  Low-VOC Water Cut-Off Mastic - Sealant TDS Sheet  

  Low-VOC Water Cut-Off Mastic - Sealant SDS Sheet  

  TPO Installation Guide  

Tools