General Construction Specifications
PART 1 - GENERAL
01 SECTION INCLUDES
A. Sealant work as required to make exterior wall joints and similar building joints watertight.
B. Joint sealing compound for interior work.
C. Traffic-grade sealant work.
02 REFERENCE STANDARDS
A. ASTM D412 - Rubber Properties in Tension.
B. ASTM C661 - Indentation Hardness of Elastomeric-Type Sealants by Means of a Durometer.
C. ASTM C734 - Test for Low-Temperature Flexibility of Latex Sealing Compounds.
D. ASTM C736 - Test for Extension-Recovery and Adhesion of Latex Sealing Compounds.
E. ASTM C794 - Adhesion-in-Peel of Elastomeric Joint Sealants.
F. ASTM C920 - Elastomeric Joint Sealants.
G. ASTM D3542 - Preformed Polychloroprene Elastomeric Joint Seals for Bridges.
H. FS TT-S-00227E - Sealing Compound, Elastomeric Type, Cold Applied, Multicomponent.
I. FS TT-S-00230C - Sealing Compound, Elastomeric Type, Cold Applied Single Component.
J. FS - Federal Specifications Indicated.
1.02 QUALITY ASSURANCE
A. Installer: Shall be trained and have a minimum of five years experience in the techniques of joint sealer applications, and shall be thoroughly familiar with recommendations of manufacturers for the specified joint sealers.
B. Laboratory Testing:
1. Before starting the exterior sealant work, lab testing for adhesion is required in accordance with ASTM C794 Test Method.
2. Lab testing shall be performed and certified by Sealant Manufacturer.
3. All materials scheduled to come in contact with exterior sealant shall be tested with type of sealant specified.
4. Sealant Manufacturer's Representative shall pick up samples at job-site after being notified by Contractor.
5. Test Reports from Sealant Manufacturer shall be forwarded to Architect for distribution to Contractor and Owner.
6. Lab testing shall be performed at no cost to Contractor, Owner and Architect.
C. Compatibility With Substrate: Manufacturer shall be responsible for verifying that joint sealers used are compatible with joint substrates.
D. Joint Tolerance: Joint width/depth are critical to joint sealer performance. Compliance with manufacturer's recommendations is required.
E. Lot/Batch # of Sealant: Contractor shall keep in file the lot/batch # and date of manufacture of each type of sealant approved for the work.
1.03 SUBMITTALS
A. Submit the following in accordance with Section 01340.
B. Manufacturer's Product Data: Indicating compliance with requirements of this section, including installation instructions for each type of joint sealer specified.
C. Samples: Manufacturer's complete color range for each type of joint sealer specified.
D. Laboratory Test Reports: Certified by Sealant Manufacturer indicating compliance with laboratory testing requirements specified in this section under "Quality Assurance".
E. Certificates from manufacturers of joint sealers attesting that their products comply with specification requirements and are suitable for the use indicated.
F. Compatibility and adhesion test reports from manufacturer indicating that materials have been tested for compatibility and adhesion with joint sealants.
G. Product test reports for each type of joint sealers, indicating compliance with requirements specified.
1.04 DELIVERY, HANDLING, STORAGE
A. Products shall be delivered to job-site in original unopened packages bearing manufacturer's labels in accordance with Section 01631.
B. Store and protect products in accordance with manufacturer's recommendations and Section 01620.
1. Maintain temperature and humidity within ranges required by manufacturer's instructions.
1.05 WARRANTY
A. Upon completion and acceptance of the project, furnish to the Owner through the Architect a written guarantee. Guarantee all items and work included in this section for a period of five years from Date of Substantial Completion, against effective workmanship and materials.
1. This guarantee shall include that the materials in contact with sealant are compatible with sealant.
B. Defects resulting from faulty materials and/or workmanship during the guarantee period shall be repaired or replaced by the Contractor at his expense.
PART 2 - PRODUCTS
03 ACCEPTABLE MANUFACTURERS
A. General: Each type of sealant specified below shall be complete with accessories and components as specified in this section and manufactured by Pecora International Corp/Harleysville, Pennsylvania, for watertight installations.
B. Substitutions: The following manufacturers are acceptable only after compliance with requirements of this section.
1. Sonneborn Building Products.
04 SEALANTS
A. Polyurethane Exterior Wall Sealant:
1. Type: Pecora "DYNATROL II" two-part polyurethane, non-sag consistency, gun grade, consisting of the following physical properties as tested by ASTM D-1850, ASTM C-920, Type M, Grade NS, Class 25, Use NT, M, A, and O; TT-5-00227E, Class A, Type II; and approved by Pecora:
a) Ultimate Strength: 135 psi, ASTM D412.
b) Modulus at 100% Elongation: 40 psi, ASTM D412.
c) Ultimate Elongation: 500% minimum, ASTM D412.
d) Shore A Hardness: 25-35, ASTM C661.
e) Adhesion-in-Peel: 20 psi minimum with 0% adhesion failure, ASTM C794.
B. High-Strength Silicone Exterior Wall Sealant:
1. Type: Pecora's "863" one-part high structural strength glazing and construction silicone sealant, non-sag, Class "A", consisting of the following physical properties as tested by Fed. Spec. TT-S-00230C, Class A and ASTM C-920, Class 25, Type S, Grade NS, Use NT, G, A, and O, and approved by Pecora:
a) Ultimate Tensile Strength: 150 psi, ASTM D412.
b) Movement Capability: 25% extension, 25% compression.
c) Hardness: Durometer 27, ASTM D412.
d) Adhesion-in-Peel: 20 lbs. peel strength and 0% adhesion loss on glass or aluminum, ASTM C794.
2. Color: To be selected by Architect.
C. Low-Modulus Silicone Interior and Exterior Wall Sealant:
1. Type: Pecora's "864" one-part silicone compound, non-sag, Class "A", consisting of the following physical properties as tested by Fed. Spec. TT-S-00230C, Class A; ASTM C-920, Class 25, Type S, Grade NS, Use NT, G, A, M, and O, and approved by Pecora:
a) Ultimate Tensile Strength: 56 psi, ASTM D412.
b) Movement Capability: 50%.
c) Hardness: Durometer 25. ASTM D412.
d) Adhesion-in-Peel: 16 lbs peel strength and 0% adhesion loss on glass or aluminum, and on mortar with P-64 Primer, ASTM C794.
D. Sealant for Horizontal Surfaces:
1. Type: Pecora "UREXPAN NR-200" two-part elastomeric polyurethane, horizontal traffic grade, cold-applied, self-leveling, consisting of the following physical properties as tested by TT-S-00227E, Class A, Type 7; ASTM C-920, Type M, Grade P, 25, Use T, M, A, G; ASTM D-1850 and approved by Pecora:
a) Maximum Movement Capability: 25% expansion.
b) Shore A Hardness: Initial 25-30, ultimate 30-35, ASTM C661.
c) Adhesion-in-Peel (primed concrete): Exceeds requirements of TT-S-00227E(3) for 7 day water immersion.
2. Color: To be selected by Architect.
E. Sealant For Inclined Surfaces:
1. Type: Pecora "DYNATRED" two-part chemically-curing elastomeric, cold-applied, traffic grade, Fed. Spec. TT-S-00227E/Class A, ASTM C920/Type M, Grade NS, Class 25. Use T, M, A, G.
2. Color: To be selected by Architect.
2.02 COMPRESSION SEALS
A. For Wall Applications:
1. Type: "WABO" Compression Seals fabricated of extruded neoprene in conformance with ASTM D3542, complete with factory-fabricated transition units, manufactured by Watson-Bowman & Acme Corp/Amherst, N.Y.
2. Color: Black
2.03 ACCESSORIES
A. Primer:
1. For Exterior Wall Joints: If laboratory test reports approved by sealant manufacturer indicate a primer is required for exterior wall joints, then the primer must be non-staining type recommended by sealant manufacturer.
2. For Horizontal and Inclined Surfaces: All pavement and paver joints MUST be primed with a non-staining primer of type recommended by sealant manufacturer.
B. Backer Rods:
1. For Vertical Wall Joints: Pecora #91 Denverfoam Open Cell Polyethylene or Pecora #92 Green Rod Closed Cell Polyethylene.
2. For Horizontal and Inclined Joints: Pecora #92 Green Rod Closed-Cell Polyethylene. Open-cell type is not acceptable for traffic grade sealant work.
3. Size: Use size that will compress 25% when inserted in joint.
C. Bondbreaker Type: Of type recommended by sealant manufacturer to suit application.
D. Joint Cleaner: Non-corrosive and non-staining, compatible with sealant, of type recommended by sealant manufacturer.
PART 3 - EXECUTION
05 PREPARATION
A. Cleaning of Joints: Clean and prepare joints to comply with recommendations of joint sealer manufacturer.
1. Remove any loose materials and other foreign matter which might impair adhesion of sealant.
B. Joint Priming: Prime joint substrates where recommended by manufacturer and according to manufacturer's recommendations. Do not allow spillage or migration onto adjoining surfaces.
C. Masking Tape: Use masking tape where required to prevent contact of sealant with adjoining surfaces. Remove tape after tooling without disturbing joint seal.
06 INSTALLATION
A. Backer Rod Installation:
1. Install backer rod in joints using a blunt instrument to avoid puncturing.
2. Do not twist rod while installing.
3. Install backer rods according to manufacturers written recommendations. Depth varies with width.
B. Joint Sealer Application:
1. Do not start exterior building sealant work before Architect has received and accepted the Sealant Manufacturer's certified lab test reports required by this section.
2. Apply joint sealers in strict compliance with manufacturer's published instructions.
3. Apply joint sealers within temperature ranges recommended by sealant manufacturer. Consult manufacturer when sealant cannot be applied with recommended temperatures ranges.
4. Apply joint sealers in joints using pressure gun with nozzle cut to fit joint width.
5. Joint sealers shall be applied in uniform, continuous beads without gaps, air pockets, embedded matter, ridges and sags.
6. Tool the joints to required configuration within the time limit of sealant application recommended by manufacturer.
7. If masking materials are used, remove masking material immediately after tooling.
C. Compression Seal Installation:
1. Clean and prepare all joints in accordance with compression seal manufacturer's published instructions.
2. Remove any loose materials and foreign which might impair adhesion of compression seals.
3. Install compression seals in strict compliance with manufacturer's published instructions.
3.02 CLEANING
A. As work progresses, remove excess materials adjacent to joints.
B. Leave finished work in neat, clean condition with no evidence of spillovers onto adjacent surfaces.
3.03 PROTECTION
A. Protect joint sealers during and after curing period from contact with contaminating substances or from damage resulting from construction operations.
B. Cut out and remove damaged or deteriorated joint sealers and repair to match original work.
END OF SECTION
