About LIBERTY™ Flashing Cement

Seal a variety of roof materials with LIBERTY™ Premium Flashing Cement. This bonding agent works with shingles, metal, built-up asphalt, SBS modified bitumen membrane end laps and perimeter edges, metal-edge flashing, gutter seams, and air conditioning ducts. This product provides bonding strength and flexibility while being easily applied with a 1/4” notched trowel or squeegee.

Installation based on applicator type:

  • Membrane flashing: Apply cement at 1 to 2 gallons per square (.4 – .8 L/m2) to substrate only.
  • Coursing: Apply cement to surface and install glass, polyester fabric, or asphalt-coated cotton fabric into cement. Repeat as wanted. Finish with a final layer of cement.
  • Metal: Prime metal. Set metal flanges into a full bead of 1/8” (3mm) thickness. Apply cement between joints and apply pressure so that a bead of cement is visible at joint edge.
  • Sealing/repairs: Apply cement at a 1/8 inch (3 mm) to 1/4 inch (6 mm) thickness, working the cement into the opening or crack and spreading beyond repair area approximately 2” – 4” (51 – 102 mm).

This product can be used to comply with certain FORTIFIED Roof™ requirements. Visit gaf.com/fortified and current FORTIFIED Home™ Standard available at fortifiedhome.org for details. Applicable in the U.S. only.

A cold-applied bonding agent for a wide variety of roofing components

LIBERTY™ Flashing Cement is ideal for a wide variety of sealing, bonding, and repairing applications in areas where temperature-related expansion and contraction occurs.

The LIBERTY™ SBS self-adhering roll roofing system

This LIBERTY™ roofing system from GAF not only simplifies installation with convenient peel-and-stick components, it’s also available in nine popular colors to complement your Timberline® or other GAF asphalt shingles.
Roofing System Limited Warranty diamond badge.

GAF LIBERTY™ product warranty

When installed as a complete system, our LIBERTY™ Limited Warranty covers up to twenty years of manufacturing defects available on select systems.* System guarantees covering material defects and workmanship errors are also available for purchase for approved systems installed by GAF certified contractors.**
*Exclusions apply. See Limited Warranty on LIBERTY ™ SBS Self-Adhering Materials for complete coverage and restrictions.
**See Low-Slope Addendum to the System Plus Limited Warranty, Low-Slope Addendum to the Silver Pledge ™ Limited Warranty, and Low-Slope Addendum to the Golden Pledge® Limited Warranty for complete coverage and limitations
LIBERTY™ Flashing Cement

LIBERTY™ step-by-step installation video

Step-by-step instructions show you how to install a LIBERTY™ low-slope roofing system.

LIBERTY™ SBS Self-Adhering 2-Ply Roofing System Installation — Step-by-step***

  1. GAF roof contractor repairing damage

    Step 1

    Inspect the roof, and repair or replace damaged areas.
  2. GAF roofing contractors rolling on LIBERTY Asphalt Primer.

    Step 2

    Apply LIBERTY™ Asphalt Primer at a rate of a 1/2 gallon per 100 sq. ft.
  3. GAF contractors installing LIBERTY SBS Self-Adhering Base/Ply on flat roof.

    Step 3

    Install LIBERTY™ Self-Adhering Base/Ply.
  4. Contractor applying LIBERTY Flashing Cement on exposed roof flange.

    Step 4

    Install edge flashing at all eave and rake edges, and apply LIBERTY™ Flashing Cement on exposed flange.
  5. GAF roofing contractors installing LIBERTY SBS Self-Adhering Cap Sheet on a flat roof.

    Step 5

    Install LIBERTY™ Self-Adhering Cap Sheet.
  6. Close up of a contractor applying Liberty Flashing Cement.

    Step 6

    Apply LIBERTY™ Flashing Cement on end laps, on exposed sheet and set the overlap back into place when applicable.
  7. Finished flat residential roof with GAF LIBERTY system.

    Step 7

    Clean up by removing tools, unused materials, and other debris. Plan on inspecting roof annually if possible.

***See application instructions for complete details.