

H&B Flex-Flash is a 40-mil thick polyester scrim reinforced flashing product formulated with Elvaloy Kee, offering exceptional durability and superior performance in both thru-wall and surface-mount applications. Flex-Flash combines the best features of traditional flashing materials, providing excellent resistance to impact, tears, and environmental extremes, while preventing issues like drooling often seen in typical "peel-and-stick" flashings.
NO MORE DROOL!
FEATURES
- Extremely tough with excellent impact and tear resistance
- Maintains flexibility in all weather environments, including extreme heat or cold
- Highly resistant to oils and repels most chemicals
- Compatible with most silicone and urethane sealants
- Suitable for both thru-wall and surface-mount applications
- Pre-formed seamless corners and end dams available upon request
- Not susceptible to degradation by UV exposure
- Pressure-sensitive, clear adhesive will not drool when exposed to UV or heat
BENEFITS
- Ideal solution for preventing moisture infiltration at sills, projections, recesses, intersections, and mortar joints
- Prevents unsightly marks and leaching that can occur with traditional rubberized asphalt flashings
- For surface-mount applications, apply to clean, dry surfaces, and use H&B Primer SA for additional adhesion if necessary
- For effective moisture management, extend Flex-Flash beyond the wall face and cut flush with the brick
- Optional Drip Plates can be used to direct moisture to the exterior
- Carrying a 10-year limited warranty for added peace of mind
NOTES
- U.S. Pat. No. 6,584,746
- Other patents pending
- Elvaloy is a registered trademark of DuPont Company
COMPATIBLE WITH
- Silicone and urethane sealants
- H&B Primer SA for additional adhesion
SIZES AND PRODUCT PACKAGING
Width | Length | Rolls/Box | LF/Box |
12" | 75' | 3 | 225' |
16" | 75' | 2 | 150' |
18" | 75' | 2 | 150' |
24" | 75' | 1 | 75' |
36" | 75' | 1 | 75' |
FLEX-FLASH SEALANT COMPATIBILITY CHART
There are various locations in a wall system where the thru-wall flashing and a construction sealant are used together to form a weather-tight seal, i.e. relief angles, soft joints, door and window perimeters. Hohmann & Barnard's Flex-Flash Membrane is compatible and has been tested for adhesion and compatibility by various sealant manufacturers.
The listing below gives a selection of both silicones and urethanes that have been evaluated. In all cases, the sealant manufacturers application procedure should be followed and they recommend that field adhesion testing should be continued throughout all projects.
POLYETHER
Company | Product |
Hohmann & Barnard |
HB Sealant |
SILICONES
Company | Product | Primer Required |
Dow Corning |
790 791 795 (Dark colors only; Black, Charcoal, or Bronze) |
1200 Prime Coat 1200 Prime Coat 1200 Prime Coat |
G.E. Silicones | Silpruf | SS4179 |
Pecora |
864NST 890NST 895NST AVB |
None (P-120 may be used if desired) |
Tremco | Spectrum 2 | #10 |
URETHANES
Company | Product | Primer Required |
SIKA |
Sikaflex-1A |
#260-205 |
Sonneborn | Sonolastic NP1 | #733 |
NOTE: When using with insulation, please verify the compatibility with the manufacturer.

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