Duro-Last Rock-Ply Membrane - Manual (Page 2)

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ROCK-PLY ® MEMBRANE
Membrane Attachment:
Mechanically Fastened – Rock-Ply membrane may be mechanically attached to a variety of roof deck and wall
materials. An appropriate slip sheet or cover board may be required. Refer to the Duro-Last Mechanically
Fastened Systems Specification for system requirements.
Duro-Bond ® System – The Duro-Bond system (inductive weld) may be used to attach Rock-Ply membrane.
Refer to the Duro-Last Duro-Bond System Specification for system requirements.
Adhered – Rock-Ply membrane may be adhered to a variety of properly prepared roof decks, walls, cover
boards and insulations including Duro-Guard™ ISO products, DensDeck
® Prime Roof Board and SECUROCK ®
Gypsum-Fiber Roof Board. Refer to the Duro-Last Adhered Systems Specification for system requirements.
Physical Properties:
Rock-Ply membrane has been subjected to the tests required by ASTM 4434 “Standard Specification for Poly
(Vinyl Chloride) Sheet Roofing” and has been classified as a Type III, internally reinforced sheet. The results of
each test as well as typical values are listed below.
Physical Property Test Method ASTM 4434 Requirement Result Typical Value
Overall Thickness ASTM D751  0.045 in. PASS 50 mil, nominal
Breaking Strength 1 ASTM D751 Grab Method  200 lbf./in. PASS 390 lbf x 438 lbf 1
Elongation 1 ASTM D751 Grab Method  15% PASS 31% x 31% 1
Seam Strength ASTM D 751 Grab Method
 292 lbf x 328 lbf
(75% of Breaking Strength)
PASS 417 lbf
Tear Strength 1 ASTM D751 Procedure B  45 lbf PASS 132 lbf x 163 lbf 1
Low Temp. Bend ASTM D2136 Must Pass at – 40 F PASS PASS
Heat Aging ASTM D3045
Conditioned for 56 days in oven
maintained at 176 F
PASS PASS
Accelerated Aging
ASTM G154
(formerly G53)
5,000 hour total test time.
Irradiance level of 0.68 W/m2-nm.
Cycle: 8 hour at 145 F,
4 hour condensation at 122 F
PASS PASS
Dimensional Stability 1 ASTM D1204
Conditioned for 6 hours in oven
maintained at 176 F.
Allowable change: ≤ 0.5%
PASS -0.30% x -0.45% 1
Water Absorption ASTM D570
Immersed in water at 158 F
for 168 hours.
Allowable Weight Change: ≤ 3%
PASS 1.7%
Static Puncture ASTM D5602  33 lbf PASS 56 lbf
Dynamic Puncture ASTM 5635  14.7 ft-lbf (20 J) PASS  14.7 ft-lbf (20 J)
1 Typical values are shown for both machine and cross machine directions. The machine direction results are listed first.
Additional Tests
Fungi Resistance ASTM G-21 No Sustained growth or discoloration
Moisture Vapor Transmission ASTM E96, Proc. B, Method A < 0.22 U.S. Perms