Instructions / Assembly

Quick Specs
HydroStop® PremiumCoat® Liquid-Applied Roong (LAR) – Version 1.3
26
Test Method #2: Field Peel Adhesion (Alternate to Test Patches)
Overview
ASTM D903 “Peel Adhesion” is found in all roof coang standards
and is especially well-suited to eld tesng with elastomeric
materials. Primers and enamels may also be evaluated by a similar
test called ASTM D3359 “Tape Adhesion.” It may also be important to
run the test wet; this is called “wet adhesion.”
Preparaon101
• Make a mock-up of the intended coang system on the exisng
roof surface.
• Duplicate any mechanical surface preparaon.
• Simulate cleaners and power washing.
• A worn Scotch-Brite
®
cleaning pad makes a good power washing
simulaon.
• Prime as specied.
• Apply a layer of elastomeric coang to the substrate.
• Installer should prepare no fewer than three (3) test patches at
dierent locaons on the roof for all quesonable roof substrates
to verify adhesion of the liquid-applied coang system.
Test Method
• Wet about 6” (152 mm) of a precut 1” (25 mm) wide by 12” (305
mm) long fabric strip with the coang.
• Allow the remaining 6” (152 mm) of the fabric to be available to
pull on the test sample.
• Apply another layer of coang to encapsulate the weed secon of
fabric.
• Allow to dry. This can be anywhere from 24 hours to 2 weeks.
• In warm weather, 1 day may be sucient.
• In cold weather, 5 days is oen required.
• The standard pracce is 1 week.
• Soak prior to tesng (best pracce).
• One hour is usually sucient; use wet rag and cover with a
bucket lid or plasc.
• Some coangs like polyvinylidene diuoride (PVDF) or silicone
may take longer.
Oponal
• Pre-cut 1” (25 mm) wide strips of butyl tape work faster and can be
used in a post installaon inspecon. A “wet adhesion” version can
be accomplished by soaking the roof area rst as indicated above,
but follow with a towel dry, and then use butyl tape to run the pull
test. The butyl tape can be easier to use with a gauge as it will bond
to itself making a perfect loop.
Quantave Evaluaon (best pracce) Qualitave Evaluaon
• Use a force gauge such as a digital sh scale or trigger
pressure gauge.
• A loop, staple or clamp may be used to hold the fabric in
the gauge.
• Pull slowly; the peak value should be above 2 pounds/
inch (2 PLI).
Excellent: Coang tears up the substrate (cohesive
failure of substrate)
Very Good: Most of the coang remains on the
substrate (cohesive failure of coang)
Good: Some coang remains on the substrate
(paral cohesive failure of coang)
Fair: Coang pulls clean but pulls below 2 pounds/
inch (2 PLI)
Poor: Test strip comes o easily and cleanly
(complete cohesive failure of coang)