231 Flashing Cement

231 Flashing Cement

231 Flashing Cement

A professional-grade, all-weather, cold-applied flashing cement ideally suited for use with many types of asphalt roofing membranes.

  • Can be used to repair conventional built-up roofs, asphalt shingles, metal roofs, and masonry surfaces.
  • Seals leaks and openings around all types of flashings, including chimneys, vents, skylights, metal joints, gutters, and similar components of built-up flashings.
  • Can be used for positive-side damp-proofing of concrete, masonry walls, and foundations.

  • ModBit
  • M&R

  • Heavy, trowel-grade consistency
  • Excellent sag resistance when used on vertical surfaces, even at high temperatures
  • Exceptional durability and performance over a wide range of challenging temperatures and weather conditions. Will not mud crack and will remain highly resilient and durable through all seasons
  • Highly flexible to accommodate the temperature-related expansion and contraction of the roofing system
  • Interlocking fiber matrix ensures uniform, excellent adhesion
  • Does not damage conventional asphalt-based roofing membranes
  • Will not separate
  • Easy to use. Ready to apply right out of the container. Smooth texture for hassle-free application with a pointed trowel, wide-edged putty knife, or gloved hand
  • Meets  Miami-Dade-County Standards



Item ID Description Packaging Qty per Ctn Weight per Ctn Cover Rate
16MH2313 MH 231 FLASHING CEMENT 3 GAL Metal Pail 1 27 8 gallons per 100 sq. ft. for 1/8"
16MH2315 MH 231 FLASHING CEMENT 5 GAL Metal Pail 1 42 8 gallons per 100 sq. ft. for 1/8"


Application Example Image


Mule-Hide #231 Flashing Cement differs from #241 and #251 in that it is a non-modified flashing cement. This product is easily spread and used to repair leaks, cracked spots, and holes in shingles as well as polymer-modified bituminous roofs (APP, SBS). Contractors seeking a refined and premium, non-modified asphalt flashing cement choose this product for all residential or commercial, low-sloped or steep-sloped roofing applications.
The coverage rate for Mule-Hide #231 Flashing Cement is approximately 8 gallons per 100 sq. ft. for a 1/8-inch (3 mm) coat applied to both surfaces. (All values are approximate and may vary with ambient temperature and job conditions.)
Mule-Hide #231 Flashing Cement can be applied using a pointed trowel, a wide-edged putty knife, or a gloved hand.
No. Mule-Hide #231 Flashing Cement is NOT RECOMMENDED for use with modified bitumen (APP, SBS) roofing membranes.
No. DO NOT USE Mule-Hide #231 Flashing Cement with PVC, TPO, EPDM or other single-ply roofing membranes.
With proper storage, the shelf life of Mule-Hide #231 Flashing Cement is 24 months from the date of manufacture.
Mule-Hide #231 Flashing Cement should be stored at a temperature of at least 45°F but not above 120°F. It should be stored at room temperature for at least 24 hours prior to application.
Mule-Hide #231 Flashing Cement should only be applied when the ambient temperature is at least 45°F and rising. Cold weather can result in uneven application and improper curing, and it will cause the product to stiffen, making application more difficult. Application is not recommended if the substrate temperature is above 140°F.

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