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.
Video thumbnail showing a residential flat top roof.

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
Thumbnail of video showing GAF LIBERTY™ Self-Adhering Roofing System step by step

LIBERTY™ step-by-step installation video

Step-by-step instructions show you how to install a LIBERTY™ low-slope roofing system.
Illustration showing how a Class 4 shingle passes an impact-resistance test while a standard shingle fails.

The LibertyTM Roll Roofing System has a UL 2218A Class 4 rating

UL 2218 impact testing involves dropping various sized steel balls onto tested materials from different heights and evaluating whether there are any cracks, tears, or fractures on the back surface of the product. Products that withstand the impact of a 2-inch steel ball dropped from 20 feet receive the highest rating, UL 2218 Class 4.
About impact resistance

Product Documentation

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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.

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