ASTM D7120/D7120M-10
(Guide)Standard Guide for Evaluation and Preparation of Roof Membranes for Coating Application
Standard Guide for Evaluation and Preparation of Roof Membranes for Coating Application
SIGNIFICANCE AND USE
This guide outlines the general procedures necessary to evaluate and prepare a roof membrane for the application of a liquid surface coating.
This guide is not all inclusive; this guide is intended to supplement detailed instructions from manufacturers and safety requirements required by law.
SCOPE
1.1 This guide covers the procedures for evaluating and preparing non-aggregate surfaced membranes for the application of a coating. It does not address design, construction, or installation issues regarding the roof assembly or the roof membrane. It is not an application guide for roof coatings.
1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
General Information
Standards Content (Sample)
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Designation: D7120/D7120M − 10
Standard Guide for
Evaluation and Preparation of Roof Membranes for Coating
Application
This standard is issued under the fixed designation D7120/D7120M; the number immediately following the designation indicates the
year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last
reapproval. A superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 2.2.2 chemical barrier, n—a barrier formed by reactive
materials either acid, alkali, or solvent, which inhibits the
1.1 This guide covers the procedures for evaluating and
adhesion of surface coatings.
preparing non-aggregate surfaced membranes for the applica-
2.2.3 exudate, n—a glossy film that forms on the surface of
tion of a coating. It does not address design, construction, or
an atactic polypropylene (APP) membrane. Exudates inhibit
installation issues regarding the roof assembly or the roof
coating adhesion and they can bleed through and stain the
membrane. It is not an application guide for roof coatings.
coating surface.
1.2 The values stated in either SI units or inch-pound units
2.2.4 loose mineral granules, n—see mineral granules,
are to be regarded separately as standard. The values stated in
disattached mineral granules.
each system may not be exact equivalents; therefore, each
2.2.5 moisture, n—surfaces to be coated must be clean and
system shall be used independently of the other. Combining
values from the two systems may result in non-conformance dry.
with the standard.
2.2.6 organic barrier, n—see organic , any of several
biological growths, usually algae or fungus, which act as a
1.3 This standard does not purport to address all of the
barrier between an APP roof membrane and a coating.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
2.2.7 release and/or anti-block agent, n—see parting agent,
priate safety and health practices and determine the applica-
any of several mineral or waxy materials which are typically
bility of regulatory limitations prior to use.
applied to an APP sheet during the manufacturing process to
prevent the sheet from sticking to itself while in the roll.
2. Terminology
2.2.8 surface oxidate, n—a barrier film, which forms on the
surfaceofanunprotectedsmoothAPPsheetduringweathering.
2.1 Definitions:
2.1.1 adequate drainage, n—the drainage condition in
3. Significance and Use
which consideration has been made for all loading deflections
of the deck, and additional roof slope has been provided to 3.1 This guide outlines the general procedures necessary to
ensure drainage of the roof area within 48 h of rainfall.
evaluate and prepare a roof membrane for the application of a
liquid surface coating.
2.1.2 contaminant, n—any substance which will adversely
effect the adhesion of a coating.
3.2 This guide is not all inclusive; this guide is intended to
supplement detailed instructions from manufacturers and
2.2 Contaminant List:
safety requirements required by law.
2.2.1 air/water-borne surface contaminant, n—any of sev-
eral types of external source contaminants that accumulate on
4. General Surface Conditions
top surface of a roof. Surface contaminants come from one of
4.1 Lack of adequate drainage will have an adverse effect on
thefollowingsources:(1)particulateandliquidemissionsfrom
roof components and will lead to premature failure of liquid
building interior operations, (2) airborne vegetable and mineral
applied coatings.
particles, and (3) oils, greases, and chemicals from industrial
and food service operations.
4.2 It is important to determine the area(s) affected by
adverse surface conditions. Specific surface preparation op-
tions can be determined after the membrane has been evaluated
1 and subsequent adhesion tests performed.
This guide is under the jurisdiction of ASTM Committee D08 on Roofing and
Waterproofing and is the direct responsibility of Subcommittee D08.20 on Roofing
4.3 Multiple surface preparation techniques may be required
Membrane Systems.
to prepare the surface of an APP modified bitumen to receive
Current edition approved July 1, 2010. Published July 2010. DOI: 10.1520/
D7120_D7120M-10. a coating.
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D7120/D7120M − 10
5. Roof Surface Evaluation 6. Preparation of the Surface
6.1 Remove contaminants prior to coating. The following
5.1 The roof membrane surface evaluation shall be con-
treatments offer different methods of preparing the membrane
ducted prior to the application of a surface coating. Surface
surfaces to receive the coating. The roof must be inspected
evaluation will assist in determining the type of preparation
prior to performing any of the following surface preparations.
required to achieve adhesion between the coating and the APP
If not properly executed, some of these treatments can damage
modified bitumen material.
the membrane.
5.1.1 Remove anything that will inhibit the adhesion of the
6.2 Surface Preparation Techniques:
coating.
6.2.1 Brooming t
...
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