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 watertightness of the roof or siding, the Galvalume ® steel, or the durable PVDF KYNAR® finish. When looking at warranties for your system, it is important to note that not all warranties are created equal. DMI warranties ensure the watertightness of all flashing conditions, trims, curbs, valleys, and penetrations. Building owners are protected with a total system warranty - “from the deck up” when using DMI insulation, fasteners, and underlayment. Our warranties are backed-up by a full-service Engineering Department, generating project specific shop drawings. Quality control is monitored by a minimum of two on-site inspections by our Field Technical Inspectors. DMI Total System Warranties give building owners and design professionals confidence that they are receiving the highest quality and most complete warranty available in the industry.

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