402-290-2423


AIA Section 071900
Water Repellents

PART 1 - GENERAL

1.1 SUMMARY

A. Section Includes:

  1. Clear water repellent coating applied to exterior [cast-in-place concrete] [precast concrete] [brick] [concrete masonry] [calcium silicate masonry] [stone] [____] surfaces.

B. Related Sections:

  1. Division 01: Administrative, procedural, and temporary work requirements.
  2. Section [03 3000 - Cast-in-Place Concrete:] [03 3300 - Architectural Concrete:] [_____ -
  3. _______:] Cast-in-place concrete surfaces to receive water repellent coating.
  4. Section [03 4500 - Precast Architectural Concrete:] [03 4713 - Tilt-Up Concrete:] [_____ -
  5. _______:] Precast concrete surfaces to receive water repellent coating.
  6. Section [04 2000 - Unit Masonry:] [04 4400 - Stone Assemblies:] [_____ - _______:] Masonry
  7. surfaces to receive water repellent coating.
  8. Section [09 2400 - Portland Cement Plastering:] [_____ - _______:] Plaster surfaces to receive
  9. water repellent coating.

1.2 REFERENCES

A. American Association of State Highway and Transportation Officials (AASHTO):

  1. T259 - Standard Method of Test for Resistance of Concrete to Chloride Ion Penetration.
  2. T260 - Standard Method of Test for Sampling and Testing for Chloride Ion in Concrete and Concrete Raw Materials.

B. ASTM International (ASTM):

  1. D4258 - Standard Practice for Surface Cleaning Concrete for Coating.
  2. D4261 - Standard Practice for Surface Cleaning Concrete Unit Masonry for Coating.
  3. D3960 - Standard Practice for Determining Volatile Organic Compound (VOC) Content of Paints and Related Coatings.
  4. E96 - Standard Test Method for Water Vapor Transmission of Materials.
  5. E514 - Standard Test Method for Water Penetration and Leakage Through Masonry.

C. Federal Specifications (Fed Spec):

  1. SS-W-110C - Water-Repellent Colorless, Silicone Resin Base.
  2. TT-C-555B - Resistance to wind Driven Rain, Coating for Exterior and Interior Masonry Surfaces

D. National Cooperative Highway Research Program (NCHRP), Series 11, 244 - Wind driven Rain

Performance Test.

1.3 SUBMITTALS

A. Submittals for Review:
1. Product Data: Include product description and performance characteristics.
 
B. Sustainable Design Submittals:
1. Regional Materials.
2. Low-Emitting Materials.

1.4 QUALITY ASSURANCE

A. Applicator Qualifications: Minimum [2] [__] years [documented] experience in work of this Section.

B. Mockup:
  1. Size: [10 x 10 ] [__ x __] feet.
  2. Determine coverage rate for application.
  3. After curing, water test to verify sufficient coverage to repel moisture from surface.
  4. Verify that application of coating to substrate will not produce surface stains or discoloration.
  5. Locate [where directed.] [____.]
  6. Allow 48 hours or until test patches are thoroughly dry before evaluating appearance, rate of application, compatibility, and effectiveness.

1.5 PROJECT CONDITIONS

A. Do not apply coating if:
  1. Ambient or surface temperature is below freezing.
  2. Possibility of entrapped or frozen water exists.
  3. Rain is expected during next 72 hours.
B. Do not apply during high winds.
C. Prevent overspray onto adjacent materials.

1.6 SEQUENCING

A. Allow new concrete to cure minimum 28 days before applying coating.
B. Allow joint sealants to cure minimum 48 hours before applying coating.
C. Allow water repellent to cure minimum 5 days before applying joint sealers to coated surfaces.

1.7 WARRANTIES

A. Provide manufacturer’s [__] year warranty that treated surfaces will repell water and have salt
repellent properties.

PART 2 - PRODUCTS

2.1 MANUFACTURERS

A. Contract Documents are based on products by Zerovoc Technology, LLC.
B. Substitutions: [Under provisions of Division 01.] [Not permitted.]

2.2 MATERIALS

A. Water Repellent:
1. Product: Lithiseal Zli71.
2. Description:
a. Water-based, self-reactive, vapor permeable, non-soluble, low-VOC water repellent, salt barrier, and dust proofer.
b. Proprietary mixture of silane/siloxane and lithium silicate.

3. Characteristics:

a. 20 percent solution tested to NCHRP 244:
1. Reduction in water absorption: One day at 75 percent, 5 days at 78 percent, 21 days at  85 percent, average at 79 percent.
2. Reduction in chloride ion content: One day at 70 percent, 5 days at 81 percent, 21 days at 89 percent, average at 80 percent.
3. Water vapor transmission: 100 percent.
4. Accelerated weathering test:
i) Resistance to ultraviolet light: No discoloration.
ii) Reduction in soluble chloride: 91 percent.
b. Water penetration; tested to ASTM E514:
1. 10 percent solution: 90 percent reduction.
 2. 20 percent solution: 90 percent reduction.
c. Resistance to chloride ion penetration: 75 percent reduction; 20 percent solution tested to
AASHTO T259 and T-260.
d. Wind driven rain: 200 hours with no effect, tested to Fed Spec TT-C-555B.
e. Water repellency; tested to Fed Spec SS-W-110C:
1. 12.5 percent solution: 0.2 percent.
2. 15.0 percent solution: 0.2 percent.
3. 20.0 percent solution: 0.3 percent.
f. Water vapor transmission; tested to ASTM E96:
1) 3.1 perms up.
2) 2.5 perms down.
g. VOC content: 100.0, tested to ASTM D3960.
 

PART 3 - EXECUTION

3.1 PREPARATION
A. Clean surfaces to ASTM [D4258.] [D4261.]
**** OR ****
B. Clean surfaces; remove loose and foreign matter that could impede penetration or performance of coating.
C. Allow surfaces to dry completely before beginning application.

 
3.2 APPLICATION
A. Apply in accordance with manufacturer's instructions.
B. Apply at rate recommended by manufacturer unless otherwise determined by testing of mockup.
C. Horizontal Surfaces:
1. Apply using low-pressure spray or roller.
2. Flood surface to saturation.
3. Apply second coat within 3 to 5 minutes after applying first coat.
4. Allow solution to remain on surface for 3 to 5 minutes, then distribute remaining pools using broom.
D. Vertical Surfaces:

1. Apply using low-pressure spray at 10 to 15 PSI with fan-shaped nozzle.
2. Begin application at bottom of wall and work up.
3. Flood surface until solution runs down 6 to 8 inches below spray pattern or sponge surfaces.
 
3.3 FIELD QUALITY CONTROL
A. Inspection: Inspect treated surfaces jointly with Architect; compare with characteristics of approved mockup.
B. Determine whether surfaces are adequately protected by water repellents,
C. After coating has dried, test surfaces with water spray and material absorption tube test; reapply
treatment to areas showing water absorption.







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