DynaClad® AP
All Purpose Roofing Underlayment

DynaClad® AP is a light-weight synthetic roofing underlayment. It is a woven polyprobylene fabric that is coated on both sides with a textured anti-slip surface (patent pending).



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Fabric Specifications

  • Weave: Woven white PP scrim (UV Stabilized)
  • Coating: 1.2 mil/1.0 mil average (28/24 g/m2/side)
  • Color: Grey
  • Weight: 3.6 oz/yd2 (122g/m2) +/- 5 % (25 lb per roll)
  • Thickness: 8 mil (0.20 mm)

ASTM D1777

Roll Specifications

  • Roll Size:  10 Squares
  • Cores:  2-inch cardboard
  • Width:  48″
  • Length:  250 ft/roll (76 m)
  • Rolls Per Pallet:  30 Rolls

These Values are typical data and are not intended as limiting specifications.

Other sizes available upon request.

Comp. Products

  • DynaClad Ultra HT Wind & Water Seal
  • Butyl Tape & Sealants
  • Poly-iso Insulation
  • Continuous Gutter Systems
  • ES-1 Rated Edge Metal Systems
  • Total System Warranties



The following is typical based on ASTM and other standard testing. It should not be considered a specification.

  • Grab Tensile – Warp 140 lb, 620 N / Weft 125 lb,555 N
    • ASTM D-5034-09
  • Strip Tensile –  (N/5cm) Warp 90 lb/in (800) / Weft 80 lb/in (701)
    • ASTM D-5035-11
  • Tensile Elongation – Warp 24% / Weft 21%
    • ASTM D-5035-11
  • Tongue Tear – Warp 35 lb, 155 N / Weft 35 lb, 155 N
    • ASTM D-2261-07a
  • Trapezoidal Tear – Warp 40 lb, 177 N / Weft 30 lb, 133 N
    • ASTM D-4533-04
  • Mullen Burst – 215 psi 1481 kPa
    • ASTM D-3786-01
  • Moisture Vapor Transmission – 0.04 perms (0.30 g/day-m²)
    • ASTM E-96-00
  • Pliability – No cracking (pass)
    • ASTM D-146-04
  • Water Ponding – No dripping (pass)
    • CAN/CSA A220.1
  • Low Temperature Flexibility – -15°C (5°F) No cracking (pass)
    • ASTM D-1970-01
  • Puncture – 4.7 joules
    • T803
  • UV Weathering – UV stabilizer added to coating for improved UV resistance
  • Class A Fire Resistance Rating
    • ASTM E-108(2007)
  • Meets the requirements of CAN/CSA A220.1
  • Florida Building Code FL6645

AIA Continuing Education

DMI is committed to providing you with high-quality expert-level education in accordance with the AIA/CES standards. The courses we offer are designed to meet the needs of architects and typically run one hour in length. All Attendees will earn 1 Learning Unit. Some of the courses offered will meet the Health, Safety, and Welfare (HSW) requirements as well as the Green Building Certification Institute (GBCI) credits.

information on available courses

Our Warranties are Second to None

DMI total system warranties protect "all aspects" of your metal envelope system. Whether that be the watertighness, the material or the finish. When looking at the warranties for your system it is important to note that not all warranties are created equal. Be sure to read the fine print to find out about any limits or exclusions. Are you truly getting a warranty or is it just a glorified maintenance agreement? Is the warranty covering all aspects of your Metal Envelope system? Is it guaranteeing that your project is being installed with the best quality? With DMI Total System Warranties you can feel confident that you are getting the best quality and guarantee in the industry!

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