665 Waterproofing Membrane

665 Waterproofing Membrane is self-adhering membrane consisting of rubberized asphalt laminated to a strong woven polypropylene mesh backing to form a minimum 65 mil membrane. 665 Membrane is 4 feet wide by 50 feet long. The membrane is delivered on a silicone release liner that serves as a carrier. The release liner is removed prior to application of the membrane. 665 Membrane is completely cold-applied and requires no special adhesives or heating equipment. It is suitable for projects where overlay temperature does not exceed 325°F and a tack coat is used prior to overlay.

Companion Products:

650 RC Liquid Adhesive

95 Liquid Membrane

650 Mastic

Membrane Installation Cart (Optional)

SURFACE PREPARATION: Pavement surfaces must be clean and dry prior to application. A smooth surface will improve adhesion. Surfaces must be free of voids, sharp projections, and debris or aggregate. New concrete must be cured a minimum of 7 days, and surfaces must be free from form release agents, curing agents, and other contaminants. Form release must be the self-dissipating type. Curing compounds containing oil, wax, silicone, or pigments should not be used.

Polyguard Membranes are equally effective on both bridges and pavement surfaces...however, there are different installation procedures for each.


Joint and Crack Repair

If liquid adhesive is required, the adhesive should be applied 1" wider than the membrane. The membrane should be centered over the joint or crack within a 2" tolerance. Transverse joints and cracks should be sealed first, starting at the outside edge of the pavement and extending the full length of the joint. The outside edge of the joint should be sealed after transverse joints. All laps should be made in such a manner that the paver does not encounter the exposed edge of the lap first. Transverse membranes should be extended 4" to 6" beyond each pavement edge. Cracks that connect with a transverse joint should be sealed with a minimum if 2-1/2" lap at the intersection with the joint. End laps in both the transverse and longitudinal membrane should have a minimum overlap of 3". The membrane should be installed straight and wrinkle free with no curled or uplifted edges. Any wrinkles over 3/8" in width shall be slit and folded down. Roll membrane thoroughly to improve adhesion.

Bridges, Parking Decks, and Parking Lot Area Repairs

The membrane should be installed straight and wrinkle free with no curled or uplifted edges. Any wrinkles over 3/8" in width should be slit and folded down. The properties of our membrane enable the material to act as a permanent seal, even under cracked pavement. The same properties also help to reduce the amount and severity of cracking in the overlying pavement.

On horizontal surfaces apply membrane from low to high pitch to provide tight seal. Side laps should be a minimum of 2-1/2". End laps should be 3". Pressure roll all membrane. A fillet or cant strip made from 95 Liquid Membrane should be applied to the clean dry deck and curb to avoid a sharp angle when applying the membrane flashing. Flashing strips should be applied at least 6" out on the deck and extend up the vertical face of the curb. The flashing should be applied to a point just below the planned height of the asphalt overlay. Press firmly to eliminate all gaps, openings or fish mouths. Seal curb or flashing terminations with 650 Mastic. Curb treatment should follow prevailing contract details. On non-working joints or cracks over 3/16" width, double ply by applying a narrow width of membrane prior to the full width membrane. Membrane surface must be rolled after application to improve adhesion.


Paving mix should be applied as specified. However, a minimum compacted thickness of less than 1-1/2" is not recommended. DOT or agency specifications regarding tack coat should be followed. If no agency specification exists, Polyguard requires a tack coat if 665 is being used. If NW-75 is being used, a tack coat is recommended. It is difficult to guarantee that the paving mix will be applied sufficiently hot due to the type of scheduling or equipment problems common to paving operations. Use of a tack coat reduces the possibility of problems resulting from overlay with a too cool mix.

Features & Benefits

  • Polypropylene mesh backing
  • 65 mils thick
  • "Peel and Stick" release liner
  • Waterproofs & Protects
  • Puncture resistant up to 200 lbs.
  • Strip Tenisle Strength of 50 lbs./in. Width
  • Grab Tensile Strength 150 lbs.
  • Permeance 0.05 max.
  • 20% Elongation at break of fabric
  • Pliability at low temperatures