Attachment_6_-_SOW_Appendix_A_4.pdf

Product Data Sheet: GacoFlex™ A48 Series

Revised: 04/2024

Gaco.com | 800-331-0196

GACOFLEX™ A48 SERIES

HIGH BUILD ACRYLIC ROOF COATING

A. DESCRIPTION:

GacoFlex A48 Series High Build Acrylic Roof Coating forms a durable liquid-applied elastomeric membrane with high tensile strength, water resistance, reflectivity, and weatherability properties. A48 series coatings are designed to be applied at high build rates (up to 80 mil WFT per pass), provide superior early rain resistance in as little as 30 minutes, and fast through cure.

B. RECOMMENDED USE:

GacoFlex A48 Series is intended as a roof maintenance coating over sprayed polyurethane foam, aged asphalt roofs, metal roofs, and aged single-ply roofing membranes. Use is restricted to circumstances where the membrane surface is in sound condition but requires a renewal of the surface due to the normal effects of use and aging.

C. LIMITATIONS:

The surface that GacoFlex A48 Series is being applied to should have a slope of at least 0.25 in / 12 in (6 mm / 305

mm) or greater in order to promote net positive drainage across the entire application area.

Not intended for use on surfaces that are prone to standing water. Consider GacoFlex silicone roof coatings when long-term resistance to ponding water is required. GacoFlex A48 Series is also not suitable for use over the following roof types: 1.) gravel surfaced built-up roofs or 2.) asphalt shingles.

D. APPROVALS:

GacoFlex A48 Series has passed the appropriate testing standards to achieve the following approvals:

E. PACKAGED PRODUCT DATA:

PROPERTY DESCRIPTION

COLOR A4800 – White

ADHESION

Excellent adhesion to polyurethane foam, such as GacoFlex GacoRoofFoam™, aged asphalt roofs, metal roofs, aged single-ply membranes, and existing coatings. Some metal roofs may require a suitable GacoFlex primer. An anti-corrosive metal primer may be used on ferrous metal roofs to help prevent corrosion from spreading. Metal panels must be structurally sound to serve as a suitable substrate for a roof coating.

GacoFlex Gaco Prime LVOC Primer may be required over existing coatings. Do not apply GacoFlex A48 Series over existing silicone coatings.

THEORETICAL

COVERAGE

864 ft² / gal / mil (80.3 m² / 3.78 L / 0.02 mm)

SOLIDS

Weight: 67 % ASTM D1644 Volume: 54 % ASTM D2697

STORAGE STABILITY

3 months when stored between 50 °F – 110 °F (10 °C – 43 °C). Do not allow product to freeze. Some separation may occur after extended storage. Mix thoroughly before use.

TOXICITY Not for use for surfaces in contact with edible substances or potable water.

YDP YAO - ATTACHMENT D

Alexander Silva Rectangle

PDS | GacoFlex™ A48 Series｜High Build Acrylic Roof Coating

Gaco.com | 800-331-0196

V.O.C. < 50 g / L EPA Method 24

FLASH POINT > 248 °F (> 120 °C) ASTM D1310

VISCOSITY 100 - 125 KUs ASTM D562

F. PHYSICAL PROPERTIES:

PROPERTY ASTM TEST REQUIREMENT RESULT

TENSILE STRENGTH – INITIAL D2370 >= 200 psi (1.4 MPa) 204 psi

(1.4 MPa)

ELONGATION AT BREAK – INITIAL D2370 >= 100 % 385 %

TENSILE STRENGTH – 1000 HOURS D2370 >= 200 psi (1.4 MPa)

(1.78 MPa)

ELONGATION AT BREAK – 1000 HOURS D2370 >= 100 % 335 %

TEAR RESISTANCE (DIE C) D624 60 min.

77 lb/in

(34 kg/25mm)

LOW TEMPERATURE FLEX D522

0.5 in (13 mm)

Mandrel, 14 °F (-10 °C)

Pass

LOW TEMPERATURE FLEX – 1,000

HOURS

D522

0.5 in (13 mm)

Mandrel, 14 °F (-10 °C)

Pass

PERMEANCE (PERMS) D1653 50 Perms. max 1.6 Perm

WET ADHESION

FOAM

D903

2.0 lb (0.9 kg) min. Pass

GALVANIZED STEEL 2.0 lb (0.9 kg) min. Pass

PLYWOOD 2.0 lb (0.9 kg) min. Pass

SBS CAP SHEET 2.0 lb (0.9 kg) min. Pass

APP 2.0 lb (0.9 kg) min. Pass

WATER SWELLING D471 20 % max 13 %

SOLAR PERFORMANCE Initial After Soiling*

SOLAR REFLECTANCE – A4800 WHITE C1549 0.79 0.79

THERMAL EMITTANCE – A4800 WHITE C1371 0.91 0.90

SOLAR REFLECTIVITY INDEX – A4800

WHITE

E1980 99 94

*CRRC Rapid Rating

G. APPLICATION:

STEP INSTRUCTIONS

THINNING Thinning is not recommended under normal conditions. If necessary, use a 10 % aqua-ammonia solution at a maximum of 4 fl. oz (120 mL) of aqua ammonia solution per 5 gal

(19 L) of GacoFlex A48 Series.

MIXING Mix until homogeneous with a mechanical mixer before application to ensure uniform color and consistency.

SURFACE

PREPARATION

Repair all leaks, cracks, and other deficiencies and seal flashings in the existing substrate using like materials as recommended by the original membrane manufacturer

PDS | GacoFlex™ A48 Series｜High Build Acrylic Roof Coating

Gaco.com | 800-331-0196 before applying GacoFlex A48 Series. Newly repaired areas may require a suitable

GacoFlex primer. Contact Technical Services for primer recommendations. When necessary, use GacoWash at 1-part concentrate to 9-parts water to clean roof before application. Rinse well and allow substrate to dry thoroughly.

NOTE: DO NOT WASH ASPHALT SUBSTRATES

APPLICATION Do not apply GacoFlex A48 Series to wet surfaces. Make sure roof surface is completely dry, clean, and free of dirt, grease, biological soiling, loose granules, and paint residue before coating. Apply GacoFlex A48 Series only when air, material, and surface temperatures are between 50 °F – 110 °F (10 °C – 43 °C). Apply product in the morning to allow for maximum dry time during daylight hours. If roof temperature exceeds 100 ºF

(38 °C), a light mist of water may be used to increase working time.

Application rates vary based on substrate type, refer to Application Specifications available at Gaco.com for further details regarding applying GacoFlex A48 using an airless spray system.

FOR USE OF AIRLESS SPRAYERS: General recommendation of 2,000 – 3,000 psi (13.8

MPa – 20.7 MPa) at the gun tip, 1.0 – 3.0 gal / min (3.8 L – 11.4 L / min) flow rate, and tip sizes ranging from 0.025 – 0.040 in (0.64 – 1 mm). Larger spray units will allow for longer hoses on larger jobs. Contact Technical Services if further assistance is required in determining the optimal equipment for project-specific requirements.

NOTE: DO NOT EXCEED 5 GAL / 100 FT² (18.9 L / 9.3 M²) PER COAT

DRY TIME Early rain resistance in as little as thirty (30) minutes. Approximate dry time is six (6) – eight

(8) hours at 72 ºF (22 °C) and 25 % RH per coat of GacoFlex A48 Series @ 60 mils WFT.

Low temperatures or high humidity conditions will extend cure times.

NOTE: Do not apply GacoFlex A48 Series when precipitation or heavy dew is expected within four (4) hours in normal humidity conditions or within six (6) – eight (8) hours in high humidity conditions.

CLEAN UP Clean up tools and equipment immediately after spraying by using a 1 – 2 % solution of aqua ammonia followed by a clean water rinse. Follow spray equipment manufacturer’s guidelines on clean up, storage and maintenance of spray equipment.

* For specific Health and Safety information please refer to applicable Safety Data Sheet.

PERIMETER EDGE-METAL FLASHING WITH SEALANT [FOAM STOP]

NOT DRAWN TO SCALE2020 SPF-2

NOTES:

SHEET-METAL EDGE FLASHING

(FOAM STOP) APPROX. 4'' WIDE

FLANGE—SEE NOTES 4 AND 5

PROPERLY PREPARE METAL

FLANGE BEFORE APPLYING SPF TO

ENHANCE ADHESION

FASTENERS

1'' MIN. THICKNESS OF SPF ABOVE METAL FLANGE

ROOF DECK—PREPARE

AS REQUIRED

SPRAY POLYURETHANE FOAM

PROTECTIVE COATING

OPTIONAL: ADDITIONAL

THICKNESS OF

PROTECTIVE COATING 12''

WIDE AT PERIMETER

V-GROOVE SPF AT EDGE AND

INSTALL ELASTOMERIC SEALANT

LE

S

S T

H A

N

1. WHERE THE SPF IS TRIMMED OR GROUND FLUSH, ADDITIONAL COATING THICKNESS IS REQUIRED.

2. THIS DETAIL SHOULD BE USED ONLY WHEN THE DECK IS SUPPORTED BY THE OUTSIDE WALL.

3. ELASTOMERIC SEALANT TO BE COMPATIBLE WITH COATING AND PRIMER

4. REFER TO THE ARCHITECTURAL METAL FLASHING SECTION OF THE NRCA ROOFING MANUAL: ARCHITECTURAL METAL FLASHING AND

CONDENSATION AND AIR LEAKAGE CONTROL FOR DESIGN, JOINERY AND SECUREMENT OPTIONS FOR COPINGS.

5. REFER TO THE INTRODUCTION OF THE CONSTRUCTION DETAILS CHAPTER FOR ADDITIONAL INFORMATION.

448 The NRCA Roofing Manual: Metal Panel and SPF Roof Systems—2020 SPF Roof Systems | Chapter 9—Construction Details

RoofManual 20_B_SPF–09-Chapter 9.indd 448RoofManual 20_B_SPF–09-Chapter 9.indd 448 12/4/19 12:11 PM12/4/19 12:11 PM

PERIMETER EDGE-METAL FLASHING [FOAM STOP]

NOT DRAWN TO SCALE2020 SPF-2A

NOTES:

1' ' M

IN

SHEET-METAL EDGE FLASHING

(FOAM STOP) APPROX. 4'' WIDE

FLANGE—SEE NOTES 3 AND 4

PROPERLY PREPARE METAL

FLANGE BEFORE APPLYING SPF TO

ENHANCE ADHESION

FASTENERS

1'' MIN. THICKNESS OF SPF

ABOVE METAL FLANGE

ROOF DECK—PREPARE

AS REQUIRED

SPRAY POLYURETHANE FOAM

PROTECTIVE COATING

1. WHERE THE SPF IS TRIMMED OR GROUND FLUSH, ADDITIONAL COATING THICKNESS IS REQUIRED.

2. THIS DETAIL SHOULD BE USED ONLY WHEN THE DECK IS SUPPORTED BY THE OUTSIDE WALL.

3. REFER TO THE ARCHITECTURAL METAL FLASHING SECTION OF THE NRCA ROOFING MANUAL: ARCHITECTURAL METAL FLASHING AND

CONDENSATION AND AIR LEAKAGE CONTROL FOR DESIGN, JOINERY AND SECUREMENT OPTIONS FOR COPINGS.

4. REFER TO THE INTRODUCTION OF THE CONSTRUCTION DETAILS CHAPTER FOR ADDITIONAL INFORMATION.

OPTIONAL: ADDITIONAL

THICKNESS OF PROTECTIVE

COATING 12" WIDE AT PERIMETER

449The NRCA Roofing Manual: Metal Panel and SPF Roof Systems—2020 SPF Roof Systems | Chapter 9—Construction Details

RoofManual 20_B_SPF–09-Chapter 9.indd 449RoofManual 20_B_SPF–09-Chapter 9.indd 449 12/4/19 12:11 PM12/4/19 12:11 PM

BASE FLASHING AT PREFABRICATED METAL CURB

NOT DRAWN TO SCALE2020 SPF-9

SPRAY POLYURETHANE FOAM

PRIME METAL BEFORE

APPLYING SPF

ROOF DECK—PREPARE

AS REQUIRED

PREFABRICATED METAL CURB

REMOVABLE SHEET-METAL

COUNTERFLASHING BEHIND

EQUIPMENT FRAME—

SEE NOTES 5 AND 6

PROTECTIVE COATING

8' ' M

IN

FL

AS

H

IN

G H

EI

G

H T

C O

AT

IN

G T

O

EX

TE

N

D

H

IG

H

ER

T

H

AN

FO

AM

NOTES:

1. THE CURBS, TOP WOOD NAILER AND SEAL STRIP ARE TO

BE SUPPLIED BY THE CURB MANUFACTURER.

2. WHEN POSSIBLE, THE MECHANICAL UNITS SHOULD NOT

BE SET UNTIL THE SPF ROOF SYSTEM HAS BEEN

INSTALLED.

3. WHERE THE SKYLIGHT, SCUTTLE OR SMOKE-VENT

FRAMES OVERLAP THE BASE FLASHING AT LEAST 3

INCHES, THE REMOVABLE SHEET-METAL

COUNTERFLASHING IS NOT REQUIRED.

4. NRCA RECOMMENDS DESIGNERS CONSIDER

PERMANENT INTERNAL OR EXTERNAL

FALL-PROTECTION DEVICES AT ALL SKYLIGHTS.

5. REFER TO THE ARCHITECTURAL METAL FLASHING

SECTION OF THE NRCA ROOFING MANUAL:

ARCHITECTURAL METAL FLASHING AND CONDENSATION

AND AIR LEAKAGE CONTROL FOR DESIGN, JOINERY AND

SECUREMENT OPTIONS FOR COUNTERFLASHINGS.

6. REFER TO THE INTRODUCTION OF THE CONSTRUCTION

DETAILS CHAPTER FOR ADDITIONAL INFORMATION.

GASKETED FASTENERS—MIN.

TWO FASTENERS PER SIDE

OPTION

PROTECTIVE COATING

RAISED CURB

SPRAY POLYURETHANE FOAM

MECHANICAL UNIT, HOOD, ETC.

SEALING MATERIAL—MUST BE

CONTINUOUS ON TOP OF THE CURB

1'' MINIMUM BELOW

TOP OF CURB

FLASHING RECEIVER

WOOD NAILER

COUNTERFLASHING

FASTENERS

BASE OF UNIT EXTENDS 1/2''

MINIMUM BEYOND TOP OF

CURB

OPTION A:

CURB-BEARING LOCATION

FOR HEAVYWEIGHT-LOADING

CONDITIONS

OPTION B:

CURB-BEARING LOCATION FOR

TYPICAL LOADING CONDITIONS

458 The NRCA Roofing Manual: Metal Panel and SPF Roof Systems—2020 SPF Roof Systems | Chapter 9—Construction Details

RoofManual 20_B_SPF–09-Chapter 9.indd 458RoofManual 20_B_SPF–09-Chapter 9.indd 458 12/4/19 12:11 PM12/4/19 12:11 PM

BASE FLASHING AT WOOD CURB

NOT DRAWN TO SCALE2020 SPF-10

WOOD CURB—

PREPARE AS REQUIRED

PROTECTIVE COATING

SPRAY POLYURETHANE

FOAM

ROOF DECK—PREPARE

AS REQUIRED

SEALING MATERIAL

ROOFTOP EQUIPMENT

FRAME

GASKETED FASTENERS—

MIN. TWO FASTENERS PER

SIDE

WOOD NAILER

ATTACHED TO SUBSTRATE—

PREPARE AS REQUIRED

SHEET-METAL RECEIVER

WITH REMOVEABLE

COUNTERFLASHING—

SEE NOTES 5 AND 6

1'' MIN. THICKNESS OVER

BLOCKING

SECTION MECHANICAL UNIT, HOOD, ETC.

BASE OF UNIT EXTENDS 1/2''

MINIMUM BEYOND TOP OF

CURB

COUNTERFLASHING

PROTECTIVE COATING

WOOD CURB

FASTENERS

SEALING MATERIAL¾MUST

BE CONTINUOUS ON TOP OF

THE CURB

1'' MINIMUM BELOW

TOP OF CURB

FLASHING RECEIVER

1. THE CURBS, TOP WOOD NAILER AND SEAL STRIP ARE TO BE

SUPPLIED BY THE CURB MANUFACTURER.

2. WHEN POSSIBLE, THE MECHANICAL UNITS SHOULD NOT BE

SET UNTIL THE SPF ROOF SYSTEM HAS BEEN INSTALLED.

3. WHERE THE SKYLIGHT, SCUTTLE OR SMOKE-VENT FRAMES

OVERLAP THE BASE FLASHING AT LEAST 3 INCHES, THE

REMOVABLE SHEET-METAL COUNTERFLASHING IS NOT

REQUIRED.

4. NRCA RECOMMENDS DESIGNERS CONSIDER PERMANENT

INTERNAL OR EXTERNAL FALL-PROTECTION DEVICES AT ALL

SKYLIGHTS.

5. REFER TO THE ARCHITECTURAL METAL FLASHING SECTION

OF THE NRCA ROOFING MANUAL: ARCHITECTURAL METAL

FLASHING AND CONDENSATION AND AIR LEAKAGE CONTROL

FOR DESIGN, JOINERY AND SECUREMENT OPTIONS FOR

COUNTERFLASHINGS.

6. REFER TO THE INTRODUCTION OF THE CONSTRUCTION

DETAILS CHAPTER FOR ADDITIONAL INFORMATION.

NOTES:

8' ' M

IN

FL

AS

H

IN

G H

EI

G

H T

C O

AT

IN

G T

O

EX

TE

N

D

" H

IG

H

ER

TH

AN

F O

AM

SPRAY POLYURETHANE FOAM

459The NRCA Roofing Manual: Metal Panel and SPF Roof Systems—2020 SPF Roof Systems | Chapter 9—Construction Details

RoofManual 20_B_SPF–09-Chapter 9.indd 459RoofManual 20_B_SPF–09-Chapter 9.indd 459 12/4/19 12:11 PM12/4/19 12:11 PM

SHEET-METAL STACK VENT [HOT OR COLD]

NOT DRAWN TO SCALE2020 SPF-15

NOTES:

1. THIS DETAIL ALLOWS THE OPENING TO BE COMPLETED BEFORE THE STACK IS PLACED.

2. THE METAL LINER TYPE, CLEARANCE NECESSARY BETWEEN THE LINER AND STACK, AND NEED FOR INSULATION WILL DEPEND ON THE

TEMPERATURE OF THE MATERIAL HANDLED BY THE STACK.

3. REFER TO THE INTRODUCTION OF THE CONSTRUCTION DETAILS CHAPTER FOR ADDITIONAL INFORMATION.

OPTIONAL:

INSULATION

APPROPRIATE FOR

STACK TEMPERATURE

4'' MIN. FLANGE—

PREPARE AS REQUIRED

SHEET-METAL RAIN

COLLAR

TEMPERATURE-

APPROPRIATE SEALANT

STAINLESS-STEEL

DRAWBAND

SEALANT

SHEET-METAL FLASHING

COLLAR—PRIME

BEFORE APPLYING SPF

PROTECTIVE COATING

SPRAY POLYURETHANE

FOAM

ROOF DECK—PREPARE

AS REQUIRED

8' ' M

IN

FL

AS

H

IN

G H

EI

G

H T

C O

AT

IN

G T

O

EX

TE

N

D

" H

IG

H

ER

TH

AN

F O

AM

465The NRCA Roofing Manual: Metal Panel and SPF Roof Systems—2020 SPF Roof Systems | Chapter 9—Construction Details

RoofManual 20_B_SPF–09-Chapter 9.indd 465RoofManual 20_B_SPF–09-Chapter 9.indd 465 12/4/19 12:11 PM12/4/19 12:11 PM

PIPE PENETRATION

NOT DRAWN TO SCALE2020 SPF-16

NOTES:

1. VENT STACKS AND OTHER PIPES SHOULD HAVE A MINIMUM 12 INCHES OF CLEARANCE ON ALL SIDES FROM WALLS, CURBS AND OTHER

PROJECTIONS TO FACILITATE PROPER FLASHING.

2. REFER TO THE INTRODUCTION OF THE CONSTRUCTION DETAILS CHAPTER FOR ADDITIONAL INFORMATION.

PREPARE PIPE

PENETRATION AS

REQUIRED BEFORE

APPLYING SPF AND

PRIME AS NECESSARY

PROTECTIVE COATING

SPRAY POLYURETHANE

FOAM

ROOF DECK—PREPARE

AS REQUIRED

8' ' M

IN

. F

LA

SH

IN

G

H

EI

G H

T C O

AT

IN

G T

O

EX

TE

N

D

" H

IG

H

ER

TH

AN

F O

AM

466 The NRCA Roofing Manual: Metal Panel and SPF Roof Systems—2020 SPF Roof Systems | Chapter 9—Construction Details

RoofManual 20_B_SPF–09-Chapter 9.indd 466RoofManual 20_B_SPF–09-Chapter 9.indd 466 12/4/19 12:11 PM12/4/19 12:11 PM

Overall Height 15"

[38.09cm]

Opening 3 15/16"

[10.03cm]

Width 9" x 9"

[22.86cm] x [22.86cm]

Height of Collar 11"

[27.94cm]

Height of Head 4"

[10.15cm]

Head Width 7 1/4"

[18.42cm]

*Height of Louvers 2 1/2"

[6.34cm]

Flashing 2 1/2"

[6.35cm]

2 1/2" [6.35cm]

*Opening of Louvers = 1/8" [0.30cm]

Active Ventilation Products, Inc.

Website: roofvents.com Email: sales@roofvents.com

Specification Sheet Keepa Attic Vent with Tailpipe Model: KV-4-TP Diameter: 4"

3/23/2022

CORRECT VENT TYPE FOR BUILDING 3

Alexander Silva Rectangle

5778-7

For EPDM Membrane Roof or Hot Tar Roof

Step 1:

Turn the vent upside down and make a cardboard template from the flange. The template should be the same size as the flange with the hole in the middle.

Step 2:

Using the template, trace the square and circle onto the roof as shown.

Step 3:

Remove cardboard template, The square and circle pattern shown.

Step 4:

With a razor blade, cut the circle traced out onto the membrane and remove. Then with a reciprocating saw, cut a hole in the roof deck and remove all debris.

Page 1 of 2Installation Instructions for KV-4

5778-7

For EPDM Membrane Roof or Hot Tar Roof

Step 5:

Apply sealant within the square flange outline.

Step 6:

Place vent within the square outline & attach using a screw gun or drill.

Step 7:

Required screw: #10 x 1.5” steel sheet metal screw Total number of screws required = (tolerance : 1/2”)

Step 8:

Appy roofing cement over the screws and edge of flange. This is how the keepa vent should look when finished.

Installation Instructions for KV-4

COMPATIBLE

SUBSTRATE TYPES:

REFER TO APPROPRIATE

APPLICATION SPECIFICATIONS

EXISTING CURB

DETAIL NO.

GA-RS-CU-1

ADDITIONAL DOCUMENTATION AVAILABLE AT GACO.COM ｜CUSTOMER SERVICE - PHONE: (800) 331-0196 / E-MAIL: CUSTOMERSERVICE @GACO.COM

MAXIMUM WARRANTY TERM:

GACOFLEX™

CATEGORY:

ROOFING SYSTEMS

(RS)

REFER TO APPROPRIATE APPLICATION SPECIFICATIONS

NOT TO SCALE

REVISION

DATE:

06/09/2023

NOTE:

1. FOR GENERAL REFERENCE ONLY ‒ NOT INTENDED FOR

PROJECT- SPECIFIC USE OR TO FULLY DEFINE A WARRANTY

ELIGIBLE APPLICATION.

2. REFER TO LATEST REVISION OF APPROPRIATE APPLICATION

SPECIFICATIONS, PRODUCT DATA SHEETS AND GENERAL

INSTRUCTIONS FOR ADDITIONAL REQUIREMENTS.

3. NON-GACO ROOFING COMPONENTS AND HARDWARE ARE

DEPICTED FOR CONTEXT-ONLY ‒ NOT INTENDED AS A

STATEMENT OF SPECIFICATION.

4. THIS DETAIL APPLIES WHEN EXISTING EQUIPMENT CANNOT

BE REMOVED FROM THE INTENDED APPLICATION AREA..

2 IN

(50 MM)

MINIMUM

8 IN (200 MM)

TO ROOF

SURFACE

APPROPRIATE

GACOFLEX

ROOF SPF

APPROPRIATE

GACOFLEX ROOF

COATING

APPROPRIATE

GACOFLEX

PRIMER

(AS REQUIRED)

EXISTING

CURB

EXISTING

EQUIPMENT

(SEE NOTE #4)

APPROVED

COUNTER FLASHING

(BY OTHERS)

APPROVED

FASTENER

(BY OTHERS)

EXISTING

METAL

DRIP EDGE

REFER TO APPROPRIATE

APPLICATION SPECIFICATIONS

ROOF EDGE (PROFILE 1) – SPF & COATING

DETAIL NO.

GA-RS-T-4

ADDITIONAL TECHNICAL DOCUMENTATION AVAILABLE ON GACO.COM ｜ CUSTOMER SERVICE - PHONE: (800) 331-0196 / E-MAIL: CUSTOMERSERVICE@GACO.COM

MAXIMUM WARRANTY TERM:

GACOFLEX™ COATING

SOLUTIONS CATEGORY:

ROOF SYSTEM

(RS)

REFER TO APPROPRIATE APPLICATION SPECIFICATIONS

NOT TO SCALE

REVISION

DATE:

01/16/2022

NOTE:

1. FOR GENERAL REFERENCE ONLY ‒ NOT INTENDED FOR

PROJECT-SPECIFIC USE OR TO FULLY DEFINE A WARRANTY

ELIGIBLE APPLICATION.

2. REFER TO LATEST REVISION OF APPROPRIATE APPLICATION

SPECIFICATIONS, PRODUCT DATA SHEETS AND GENERAL

INSTRUCTIONS FOR ADDITIONAL REQUIREMENTS.

3. NON-GACO ROOFING COMPONENTS AND HARDWARE ARE

DEPICTED FOR CONTEXT-ONLY ‒ NOT INTENDED AS A

STATEMENT OF SPECIFICATION.

4. APPLICATION MUST EXTEND ALL THE WAY UP TO OUTSIDE

CORNER OF ROOF EDGE.

5. METAL ROOF EDGE PROFILE IS A GENERALIZATION FOR

CONTEXT ONLY. PLEASE CONTACT YOUR GACOFLEX SALES

REPRESENTATIVE REGARDING THE COMPATIBILITY OF A

PARTICULAR METAL ROOF EDGE PRODUCT PRIOR TO

PURCHASE OR USE.

EXISTING ROOF

DECK

EXISTING

INSULATION

APPROVED METAL

ROOF EDGE

(BY OTHERS)

(SEE NOTE #5)

APPROPRIATE

GACOFLEX

COATING

(SEE NOTE #4)

APPROPRIATE

CAULKING

APPROPRIATE

GACO SPRAY

POLYURETHANE FOAM

APPROVED CLEAT

(BY OTHERS)

APPROVED METAL

ROOF EDGE

(BY OTHERS)

(SEE NOTE #5)

REFER TO APPROPRIATE

APPLICATION SPECIFICATIONS

PIPE ∕ VENT PENETRATION ‒

FIBERED FLASHING METHOD

DETAIL NO.

GA-RC-P-1

ADDITIONAL TECHNICAL DOCUMENTATION AVAILABLE ON GACO.COM ︱ CUSTOMER SERVICE - PHONE: (800) 331-0196 / E-MAIL: CUSTOMERSERVICE@GACO.COM

MAXIMUM WARRANTY TERM:

GACOFLEX™ COATING

SOLUTIONS CATEGORY:

ROOF COATING

(RC)

REFER TO APPROPRIATE APPLICATION SPECIFICATIONS

NOT TO SCALE

REVISION

DATE:

01/14/2022

NOTE:

1. FOR GENERAL REFERENCE ONLY - NOT INTENDED FOR

PROJECT-SPECIFIC USE OR WARRANTY TERM DEFINITION.

2. REFER TO APPROPRIATE APPLICATION SPECIFICATIONS,

PRODUCT DATA SHEETS AND GENERAL INSTRUCTIONS

FOR FURTHER REQUIREMENTS.

3. ENSURE USE OF LATEST REVISION OF REFERENCED

TECHNICAL DOCUMENTATION - AVAILABLE ON GACO.COM.

4. THIRD-PARTY COMPONENTS DEPICTED ARE FOR CONTEXT

ONLY AND NOT A STATEMENT OF SPECIFICATION.

5. REFER TO DETAIL NO. "GA-RC-P-1A" FOR ALTERNATIVE

APPLICATION METHOD.

6. APPLY CENTERED ON CHANGE OF PLANE.

2 IN

(51 MM)

2 IN

(51 MM)

0.5 IN

(13 MM)

MINIMUM

0.5 IN

(13 MM)

MINIMUM

APPROPRIATE

GACOFLEX

PRIMER

(AS NEEDED)

(SEE NOTE #6)

PIPE / VENT

FLASHING

OR BOOT

(BY OTHERS)

APPROPRIATE

GACOFLEX

FIBERED FLASHING

EXISTING

ROOF MEMBRANE

EXISTING

ROOF DECK EXISTING

PIPE / VENT

PENETRATION

Application Specification: RC-A48-12-5 Revised: 01/2024

Gaco.com | 800-331-0196

DIVISION 07 01 50.61:

GACOFLEX™ A48 SERIES HIGH BUILD ACRYLIC ROOF COATING

FOR RECOATING ACRYLIC ROOF COATING SYSTEMS

PART 1 – GENERAL

1.1 SUMMARY

A. This specification provides a remedial coating system for application over pre-existing acrylic roof coating systems over a roofing substrate. The use is restricted to circumstances where the membrane surface is in sound condition but requires a renewal of the membrane surface due to the normal effect of aging and use.

When properly applied, GacoFlex A48 Series High Build Acrylic Roof Coating provides a weathertight seal that protects the substrate from degradation caused by normal weathering hazards

NOTE: The roof substrate should have a slope of at least 2 in / 12 in (50.5 mm / 305 mm) or greater in order to promote net positive drainage across the entire application area. Not intended for use on roofs that are prone to standing water.

B. This specification is intended only as a guide for the development of a project specification. The suitability of this specification for a particular project must be determined by a qualified representative of the owner

CONDITIONS TO CHECK AND CORRECT PRIOR TO INSTALLATION INCLUDE:

• With proper surface preparation (including the use of primer – when determined necessary by adhesion test) most pre-existing acrylic roof coating system can be recoated.

• The type of pre-existing coating system must be identified before proceeding.

• The existing coated roofing system substrate must be fully adhered or mechanically attached and intact.

• Existing foam roofs with extensive delamination or blistering of the foam or the coating system, or with major areas of wet, saturated foam, etc., will require total removal and replacement.

• The structural decking must be sound.

C. Elements of this specification may require modification in order to clearly delineate project requirements.

Sections that are not pertinent may be deleted.

D. Adhesion tests are required prior to bidding, with special attention to determine if a primer is necessary given the condition of the existing substrate. A Coating Applicator that is licensed by the product manufacturer should perform wet and dry adhesion tests as instructed in GacoFlex General Instructions GW-1-3 Adhesion Testing Procedures using the products listed in Section 2.2.

1.2 RELATED SECTIONS

A. Cast-In-Place Concrete: Division 03 30 00 F. Vapor /Air Barriers: Division 07 25 00

B. Flashing/Sheet Metal: Division 07 60 00 G. Board Insulation: Division 07 22 00

C. Roof Accessories: Division 07 72 00 H. Skylights: Division 08 60 00

D. Rough Carpentry/Wood Blocking: Division 06 10 00 I. Metal Decking: Division 05 30 00

E. Drains, Vents and Penetrations: Division 22 14 26.13

RC-A48-12-5

Gaco.com | 800-331-0196

1.3 SUBMITTALS

A. PRODUCT DATA:

Submit manufacturer’s standard submittal package including specification, installation instructions and general information for each waterproofing material.

B. APPLICATOR QUALIFICATIONS:

Submit current Letter of Good Standing from the specified waterproofing manufacturer.

C. SUBSTRATE CONDITIONS:

1. Applicator to present to owner a completed inspection report verifying substrate condition and any noted defects not specifically addressed in regard to the installation of the coating.

2. Surface shall be free from loose dirt, stone, debris, moisture, and shall be in stable condition. Any work on the area to receive this application shall be completed prior to the installation of the coating.

3. Applicator shall complete a substrate inspection prior to the start of the installation of the coating. The architect/owner and Applicator shall accept the substrate. Start of the work constitutes acceptance.

1.4 QUALIFICATION

A. Primary waterproofing materials shall be the products of a single manufacturer. Secondary materials shall be recommended by the primary manufacturer. The manufacturer shall have a minimum of ten (10) years’ experience in the manufacture of materials of this type.

B. Applicators shall have a minimum of five (5) years’ experience in the application of waterproofing materials of the type specified. The Applicator shall possess a current Letter of Good Standing from the specified waterproofing manufacturer.

C. PRE-BID CONFERENCE:

Ten (10) working days prior to the bid opening there is to be a mandatory Pre-Bid Conference. Those not attending the Pre-Bid Conference will not be allowed to bid the project. All products considered an equal to the specified product or any changes in the scope of work, installation, or specifications must be presented at the Pre-Bid Conference. If a change in the specifications is accepted, it will be considered as an alternate and will be presented as a bid addendum issued five (5) working days prior to the bid opening. No other changes to the specification or bid documents will be accepted.

D. Materials other than those specified shall be submitted to the architect/owner for approval no later than ten (10) days prior to the bid date. In requesting prior approval, it shall be necessary to submit:

1. A letter of certification, signed by an officer of the manufacturer, stating that the alternate material is equal to or better than the specified product.

2. Independent laboratory test data giving physical property values in comparison to the specified material.

E. PRE-INSTALLATION CONFERENCE: Just prior to the commencement of the installation, meet at the jobsite with a representative of the coating manufacturer, Applicator, general contractor, architect, and other parties affected by this section. Review the methods and procedures, substrate conditions, scheduling, and safety.

1.5 DELIVERY, STORAGE AND HANDLING

A. Owner/owner’s representative shall reject damaged or non-conforming materials. Rejected materials must be removed immediately from the job site.

B. Store the coating materials as recommended by the manufacturer and conforming to applicable safety regulatory agencies: town or city, state, and federal. Refer to all applicable data including, but not limited to:

Safety Data Sheets, Product Data Sheets, product labels, and specific instructions for personal protection.

C. Provide adequate ventilation, protection from hazardous fumes, and overspray potential to workers and associated trades in close proximity of the site application.

Gaco.com | 800-331-0196

1.6 WARRANTY

A. Manufacturer warrants that the material supplied will meet or exceed physical properties as published. The Applicator guarantees that workmanship will be free of defects in coating application. Since performance of previously applied coatings is beyond the control of Manufacturer and Applicator, requests for additional warranty coverage shall be subject to prior approval by Manufacturer.

B. A FIVE (5) YEAR LABOR AND MATERIAL WARRANTY MUST BE OBTAINED THROUGH THE

MANUFACTURER.

C. PROTECTION OF BUILDING AND OCCUPANTS:

1. All surfaces not to receive the coating specified shall be protected from overspray hazard, e.g., windows, doors, exterior surfaces and facades, parking lots, and vehicles. Protective coverings shall be secured against wind and shall be vented if used in conjunction with applications preventing collection and moisture.

2. Applicator to post signs noting potential overspray hazard within 400 ft (122 m) of applications.

3. All air intake ventilation equipment shall be turned off to prevent fumes from entering building.

4. Surfaces damaged during application shall be restored at no expense to the owner.

5. No smoking signs to be posted as mandated by local fire officials.

D. SUBSTRATE:

Proceed with work as specified only after substrate construction, preparation, and detail work has been completed.

E. EQUIPMENT:

All equipment used during operations shall be located so as not to adversely affect the daily operations or endanger occupants, structure, or materials on-site. All spray equipment must be grounded during operations.

PART 2 - PRODUCTS

2.1 MANUFACTURERS

ACCEPTABLE MANUFACTURERS:

Gaco, www.gaco.com – Manufactured by Holcim Solutions and Products US, LLC Other brands manufactured by Holcim Solutions and Products US, LLC as noted.

2.2 MATERIALS

A. CLEANER:

GacoFlex GacoWash Concentrated Cleaner

B. PRIMER: *Existing silicone coatings should not be primed

GacoPrime LVOC Primer (as needed) (GacoFlex E5320 Primer is an acceptable alternate)

C. SACRIFICIAL TAPE:

ScotchBlue™ ORIGINAL Painter’s Tape or equivalent (as needed)

D. FLASHING:

1.) GacoFlex 66S Reinforcing Polyester Mesh Tape 2.) GacoFlex AF4700 Acrylic Roof Patch 3.) GacoFlex UF9022 – GacoMastic™ 4.) ERsystems® H.E.R.

E. ACRYLIC COATING:

GacoFlex A48 Series High Build Acrylic Roof Coating with the following physical properties:

GacoFlex A48 Series | High Build Acrylic Roof Coating

PROPERTY VALUE TEST METHOD

TENSILE STRENGTH

(INITIAL)

217 psi (1.5 MPa)

ASTM D2370

ELONGATION AT BREAK

(INITIAL)

200 % ASTM D2370

http://www.gaco.com/

Gaco.com | 800-331-0196

PART 3 - EXECUTION

3.1. EXAMINATION

A. A nuclear or infrared scan must be performed, and any wet roofing materials must be removed and replaced.

B. Repairs to the structural components of the roof should be complete.

C. Verify that drains, vents, ducts, gutters, metal cap flashing, or other penetrations have been replaced or modified as needed.

3.2 PREPARATION

NOTE: IT IS EXTREMELY IMPORTANT FOR THE ROOF TO BE CLEAN AND DRY.

NOTE: For previously coated asphalt substrates, or for any substrate on which the existing coating shows excessive wear, voids, or bare spots, please contact Technical Services for surface preparation requirements.

A. First remove heavy deposits of dirt, leaves and other debris from the roof using a stiff broom or air broom, then inspect the entire roof surface and flashings for any open seams, tears, cuts, etc. Repair these defects using “like” materials recommended by the coating manufacturer so water does not enter the coated roofing system during the cleaning process. Pressure wash roof with water and allow to dry completely.

B. After the roof is dry from initial cleaning, apply GacoWash Concentrated Cleaner according to label instructions with sprayer of choice, using a 3 - 4 ft (0.9 - 1.2 m) arc pattern. A Hudson-type agricultural sprayer, conventional pressure sprayer or airless sprayer is recommended. Allow solution to stand for 10-15 minutes, adding a light mist of water to prevent drying. While it sets, lightly agitate any heavily soiled areas with a broom or brush. Do not allow dirt to settle in low areas. Use a commercial power washer >3,000 psi (21 MPa) to remove debris and continue rinsing until all suds are gone. Start at the highest point of the roof and work towards the lowest point. For low-sloped roofs, work away from and then back towards, roof drains. It is important to keep the surface wet until all of the GacoWash and other residue has been completely rinsed off and the surface is clean. After cleaning and rinsing the roof, ensure no dirt or debris is present.

C. BIOLOGICAL CONTROL:

Areas of algae, mildew or fungus on the roof membrane or the existing coating should be treated with a solution of 1-part household bleach and 3-parts water, followed by a power washer rinse using clear water.

D. SUBSTRATE DRYING:

Allow surfaces to dry thoroughly. Examine the roof, paying particular attention to areas of physical damage or previous repairs to determine that residual water has in fact dried before applying GacoFlex A48 Series High Build Acrylic Roof Coating.

NOTE: Drying time depends on weather conditions such as temperature, humidity and air movement. The above drying times assume good weather (70 °F / 21 °C daytime temperature) and no rain. Conditions of lower temperature and rain will require a longer period for drying.

3.3 INSTALLATION

A. TECHNICAL ADVICE:

The installation of this system shall be accomplished in the presence or with the advice of the manufacturer’s technical representative. Contact Technical Services for assistance.

B. REPAIRS:

1. Areas of delaminated, warped, bowed or saturated insulation must be removed down to the structural decking, replaced with compatible materials and appropriately attached.

SOLIDS

Weight: 67 % Volume: 53 %

ASTM D1644

ASTM D2697

VOC < 50 g / L EPA Method 24

TEAR RESISTANCE

(DIE C)

103 lb / in (47.2 kg / 25 mm)

ASTM D624

Gaco.com | 800-331-0196

2. In areas where the coated substrate has been damaged (such as polyurethane foam with an abraded or ground surface or where loose coating has been removed), spot prime with one (1) coat of GacoPrime LVOC Primer by brush or spray to the surface.

3. Remove defective pitch pan filler, metal flashing sealants or termination caulking and replace appropriately.

C. AT ALL FLASHED SURFACES OF THE EXISTING ROOF COATING (IN ADDITION TO ALL OTHER AREAS

REQUIRING FLASHING) CHOOSE ONE OF THE FOLLOWING:

1. Apply GacoFlex A48 Series High Build Acrylic Roof Coating by brush or roller at a minimum width of 6 in (152

mm) centered on the seam at minimum rate of 1.5 gal / 100 ft² (5.7 L / 9.3 m²) to obtain a Wet Film Thickness (WFT) of 24 mils (approx. 200 LF / gal (61 LM / 3.8 L). Immediately embed a 4 in (102 mm) strip of GacoFlex 66S Reinforcing Polyester Mesh Tape into the wet coating and ensure it is fully embedded into the coating.

GacoFlex 66S Reinforcing Polyester Mesh Tape must be smoothly applied without wrinkles, “fish mouths,” blisters, or pin holes. Once the Coating with embedded GacoFlex 66S Reinforcing Polyester Mesh Tape is firm to the touch, apply another coat of GacoFlex A48 Series High Build Acrylic Roof Coating at a minimum rate of 1.5 gal / 100 ft² (5.7 L / 9.3 m²) and ensure complete encapsulation of the tape.

Allow to dry for a minimum of 4 – 6 hours (at 75 ºF (24 °C) and 50% RH) before proceeding to the next step of installation. Low temperatures or high humidity conditions will extend dry times. Do not apply GacoFlex A48 Series High Build Acrylic Roof Coating when precipitation or heavy dew is expected within 4 hours (6 – 8 hours in high humidity conditions). Apply product in the morning to allow for maximum dry time during daylight hours.

2. Apply sacrificial tape ScotchBlue™ ORIGINAL Painter’s Tape (or equivalent) as required. Apply GacoFlex AF4700 Acrylic SeamSeal at a minimum rate of 4 in (102 mm) wide, crested and centered at the seam, with a minimum thickness at the center of 64 wet mils (approx. 70 LF / gal (22 LM / 3.8 L)). Allow to cure for four (4)

– six (6) hours (longer in overcast or low humidity conditions) before proceeding to the next step of installation.

3. Apply sacrificial tape ScotchBlue™ ORIGINAL Painter’s Tape (or equivalent) as required. Apply GacoFlex UF9022 – GacoMastic at the approximate rate of 70 LF / gal and 4 in (102 mm) wide, crested and centered at the seam. Achieve an average minimum WFT of 64 mils when measured at center at all areas to receive flashing. Allow to dry a minimum of forty (40) hours at 75 °F (24 °C) and 55 % R.H. to achieve full cure. Low humidity and low temperature will result in longer cure times.

4. Apply ERSystems H.E.R. Sealant at the approximate rate of 70 LF / gal and 4 in (102 mm) wide, crested and centered at the seam. Achieve an average minimum WFT of 64 mils when measured at center at all areas to receive flashing. Allow to dry a minimum of twelve (12) to twenty-four (24) hours at 75 °F (23.9 °C) and 45 % R.H. Weather related conditions such as frost, dew, mist, condensation, humidity, and temperature must be taken into consideration prior to coating. Temperature should be above 40 °F (4.45 °C) more than 5 °F (2.8 °C) above the dew point and rising, for best application results.

NOTE: Refer to manufacturer’s product instructions and/or data sheet for important information regarding drying times and other important factors to consider regarding application.

D. ROOF EQUIPMENT (HVAC / SLEEPERS):

FOR EXISTING HVAC UNITS AND OTHER EQUIPMENT ON CURBS WITH A MEMBRANE FLASHING: The membrane flashing must be coated up to the bottom of the metal cap of the unit and sealed underneath with a roof system compatible sealant. Curbs must be a minimum of 8 in (203 mm) above the roofing membrane.

Any units that are sitting on 4 in (102 mm) x 4 in (102 mm) wooden sleepers will be lifted so that the membrane underneath the units can be cleaned, primed (when required due to unsuccessful adhesion test) and coated following application instructions within this document. An approved slip sheet shall be placed under the sleepers to protect the coating system. If the units are not lifted off the deck to be able to accomplish this procedure, the untreated area will be excluded from the warrant

E. PRIMER:

*Existing silicone coatings should not be primed If adhesion testing indicated the need for a primer, apply GacoPrime Low VOC Primer at minimum rate of 200 - 250 ft² / gal (18 - 23 m² / 3.8 L). Avoid puddling of primer on the surface. Required Minimum Wet Film Thickness (WFT) is 6 - 8 mils. Apply via one (1) of the following three (3) application methods: 1.) BRUSH: Use solvent resistant brush and apply. 2.) ROLLER: Apply with a solvent resistant short nap roller. 3.) SPRAY: Do not thin. Use pressure pot or airless sprayer to apply primer. Avoid puddling of primer on surface when spraying.

Gaco.com | 800-331-0196

Allow GacoPrime Low VOC Primer to dry completely (approximately two (2) hours – dependent on ambient conditions). GacoPrime will dry to a slightly tacky film. Test the primer film by pressing firmly with a finger and removing. Properly dried film will be well-bonded to the substrate. If the film of applied product is able to be removed from the substrate, allow additional drying time. Application of GacoFlex Coating must be completed within twenty-four (24) hours from the start of GacoPrime Low VOC Primer Application.

NOTE: IF GACOPRIME LOW VOC PRIMER IS LEFT EXPOSED TO THE ENVIRONMENT LONGER THAN

TWENTY-FOUR (24) HOURS, IT MUST BE RE-APPLIED IN ORDER FOR A WARRANTABLE

APPLICATION TO OCCUR. Clean surface with GacoWash and allow to dry thoroughly. Re-apply GacoPrime Low VOC Primer at the specified coverage rate before applying a GacoFlex Roof Coating.

F. ACRYLIC COATING:

Apply one (1) pass of GacoFlex A48 Series High Build Acrylic Roof Coating at the average rate of 1.5 gal / 100 ft² (5.7 L / 9.25 m²) to obtain a minimum Wet Film Thickness (WFT) of 24 mil / Dry Film Thickness (DFT) of 12 mil. Apply using an airless sprayer. General recommendation of 2,000 – 3,000 psi (13.8 MPa – 20.7 MPa) at the gun tip, 1.0 –3.0 gal / min (3.8 L – 11.4 L / min) flow rate, and tip sizes ranging from 0.025 – 0.040 in (0.64

– 1 mm). Larger spray units will allow for longer hoses on larger jobs. Contact Technical Services if further assistance is required in determining the optimal equipment for project-specific requirements.

Early rain resistance in less than 4 hours. Approximate dry time is 6-8 hours at 72 ºF (22 °C) and 25 % RH per coat of GacoFlex A48 Series Roof Coating @ 60 mils WFT. Low temperatures or high humidity conditions will extend cure times. Do not apply GacoFlex A48 Series Roof Coating when precipitation or heavy dew is expected within 4 hours (6–8 hours in high humidity conditions).

G. CLEAN-UP:

Clean up tools and equipment immediately after spraying by using a 1 to 2 % solution of aqua ammonia followed by a clean water rinse. Follow spray equipment manufacturer’s guidelines on clean up, storage and maintenance of spray equipment

3.4 FIELD QUALITY CONTROL

A. Any variations from the specified limits found by the Applicator or owner’s representative shall be corrected by the Applicator.

B. MINIMUM DRY FILM THICKNESS (DFT) REQUIREMENT:

Gaco recommends adding a 10 % variance factor to obtain the minimum DFT mil thickness required. It is the Applicator’s responsibility to calculate the amount of coating needed to obtain the minimum DFT mil thickness required.

C. No traffic shall be permitted on the coated surface for a minimum of three (3) days. Damage to the surface by other trades shall not be the responsibility of the Applicator.