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VaproBond is a single component 100% silicone sealant designed to function as an adhesive sealant and an all-weather silicone liquid flashing material.


VaproBond is appropriate for above-grade applications to concrete, masonry, natural stone, structural sheathing, architectural metal panels, painted metals, glass, PVC, FRP, EPDM, all VaproShield WRB/Air Barrier membranes, and most other building materials.


  • Approved for use as a flashing material with metal framing systems. Not recommended for wood applications. VaproShield recommends VaproLiqui-Flash™ with wood applications.
  • Usable over a wide temperature range. -50 ° to 300 °F (-45° to 149 °C)
  • Cured service temperatures: -50 ° to 300 °F (-45° to 149 °C)
  • Excellent weatherability, UV stable for extended exposure
  • Remains flexible under extreme temperatures
  • Compatible with an extensive list of materials from various manufacturers, view list here.


VaproBond is available in 20 fl oz (592 g/ml) sausages

Sealant Flashing

¼” (6 mm) bead will adhere 125 ft. (38 m) of overlapping membrane

30-45 wet mils (0.76 – 1.14 mm) covers 6-8 ft2 (0.56-0.74 m2) Not recommended for wood applications.


  • Apply using a professional caulking gun.
  • Use a DRY joint knife, trowel, or spatula to spread.
  • Do not use soapy water or alcohol when tooling or spreading.


  • Store VaproBond unopened sausages at temperatures lower than 80 °F (27 °C).
  • Do not open sausage until preparation work has been completed.
  • Do not alter or mix with other chemicals.
  • When stored at or below 80 °F (27 °C) VaproBond has a shelf life of 12 months after the date of manufacture.
  • Do not double stack pallets.
  • Dispose of unused product and container in accordance with local, state and federal regulations.


  • Immediately remove all excess VaproBond in undesired areas with mineral spirits.
  • Clean tools and equipment with mineral spirits or similar solvent immediately after use.
  • Observe all manufacture’s safety precautions.
  • Remove cured VaproBond using a sharp-edged tool.
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1. Install WrapFlashing SA Self-Adhered into sill with 2.75” folded into Rough Opening (R.O.) 9” left on face, with bottom 6” of release film to remain attached.

2. Install jamb pieces with 2.75” folded into R.O. 9” to be left on face. 
 3  VaproBond Flashing Installation 1 install
3. Install head piece with 2.75” folded into R.O. 9” to be left on face. Roll all WrapFlashing SA (orange) sections with weighted roller to ensure full contact.

4. Using the sausage gun, apply VaproBond in a zigzag pattern on the wall face surrounding the rough opening.

 VaproBond Flashing Installation 2 installation  VaproBond Flashing Installation 3 install
5. Immediately spread the applied material with a putty knife creating a 1” (25 mm) border around the rough opening.

6. Apply additional VaproBond in zigzag pattern on all inner surfaces of the rough opening.

VaproBond Flashing Installation 4 install VaproBond Flashing Installation 5 install

7. Immediately spread until all surfaces are completely covered and substrate below is no longer visible (approximately 30-45 wet mils (0.76-1.14mm)).

8. Allow VaproBond to set, then inspect for voids and apply additional VaproBond as needed to achieve complete coverage. RO is now ready for window and head flashing installation (by others).

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*Roll all WrapFlashing SA (orange) sections with weighted roller to ensure full contact.

Sealant Between Membrane

VaproBond Sealing Installation 1

Overlap vertical seams by 12” (305 mm) minimum. Apply VaproBond adhesive sealant bead just below Integrated Tape line at the vertical seam joint.


Use hand roller to seal the seam for an air and water tight seal.

Tear and Abrasion Repair

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Typical installation tears or abrasions Remove excess membrane from tear until smooth with substrate. Cut and apply a patch of self-adhered field membrane or VaproFlashing SA Self-Adhered, remove release film, smooth over with hand pressure.
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Use hand roller to ensure complete adhesion. Abrasion Repair: apply VaproBond over abrasion and tool with a DRY joint knife, trowel or spatula. Hole Patch Repair: seal the reverse lap (at top) with VaproBond to ensure a water and air tight seal.
Reverse Lap Sealant
Bond INstall 1 Bond INstall 2
Apply 3/8” (9.5mm) minimum bead line of VaproBond to the reverse lapped membrane. Use a DRY joint knife or trowel to tool VaproBond to shed water.
Other Typical Sealant Uses
Bond INstall 3 Bond INstall 4
Head flashing sealant Sealing VaproSilicone Transition Materials
Bond INstall 5 Bond INstall 6
Penetration Sealant Interior Air Seal
Bond INstall 7 Bond INstall 8
Outward Floorline Movement Joint Inward Floorline Movement Joint