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READ AND **REMOVE THIS PAGE** BEFORE PLACING

THE SPECIFICATION SECTION IN THE CONTRACT

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[DIVISION 7: THERMAL AND MOISTURE PROTECTION]{.underline}

SECTION 07920 ‑ SEALANTS AND CAULKING

USE: Furnishing and installing sealant materials to prevent moisture
transmission into a building.

**NOTES TO SPECIFIER:**

A. Options within paragraphs are identified by enclosure in brackets;
blank spaces enclosed by brackets \[\_\_\_\_\_\] provide for information
to be inserted, as appropriate, to individual projects.

B. **TO AVOID CONFLICTING REQUIREMENTS AND COSTLY MISTAKES,** the
specifier must edit (delete, substitute or add to the text). The
remaining paragraphs must be renumbered.

C. DELETE FOR FINAL COPY: Notes to the Specifier, located between lines
of asterisks; all \[brackets\], [underlining]{.underline}, **boldface**,
and *italics*, within the paragraphs; and this page. (Open Reveal Codes
\[alt F3\] to do this accurately.)

D. [To Edit "(Footer B)":]{.underline} (Corel 8). **ENTIRE FOOTER SHOULD
BE BOLDED.** Click in the footer and delete the "Project Name (ftr B)"
text and replace it with the **Name of the Project (upper and lower
case)**. Replace date with current MM/YY (WITHOUT BRACKETS).

E. The Guide Specifications are intended to be continuously reviewed and
revised. User's technical comments are appreciated. Also, other related
or similar specification that are written "from scratch" that could
benefit others, or other questions can be sent to NSTC A/E Group, ST
110, or call (303) 987-6868.

**DRAWING DATA REQUIRED:**

**REQUIRED SPEC MODIFICATIONS:**

[GENERAL NOTES]{.underline}

A. Whenever entire articles, paragraphs, or subparagraphs are not
applicable, the articles, paragraphs, or subparagraphs should be
deleted; when necessary, reletter or renumber articles, paragraphs, or
subparagraphs.

B. THIS GUIDE IS NOT INTENDED AS A SUBSTITUTE FOR READING THE ENTIRE
SECTION.

[TECHNICAL NOTES]{.underline}

A. 1.1B: Select or add applicable specification sections. Do not list
specification sections from Division 7.

B. 1.2: Select or add applicable references.

C. 1.3A: Select applicable specification section.

D. 1.3B: Insert number of copies of descriptive data required. Normally
5 copies are required. Distribution after review is normally 1 copy to
the CO, 3 copies to the Contractor, and 1 copy to the project file.

E. 1.3C: Insert number of copies of Certificates of Conformance
required. Normally 5 copies are required. Distribution after review is
normally 1 copy to the CO, 3 copies to the Contractor, and 1 copy to the
project file.

F. 1.3D: Insert number of samples required. Normally 2 samples are
required. Distribution after review is normally 1 sample to the COR, and
1 sample to the Contractor.

G. 4.1 and 4.2: When a \"lump sum\" Contract is used, delete the title
PART 4: MEASUREMENT AND PAYMENT, and both articles from this
specification section. Measurement and payment will be addressed in Part
4 of Section 01010.

**REVISIONS OF THIS SECTION:**

CSI format, editorial changes: 12/01

Metric:

Technical Update: 01/94

SECTION 07920

SEALANTS AND CAULKING

[PART 1: GENERAL]{.underline}

1.1 SUMMARY:

A. Section Includes: Furnishing and installing single-component sealant
for exterior joints to prevent moisture from gaining access to the
building, also in the interior of the building where moisture
transmission would be problematical.

1.2 REFERENCES:

A. American Society for Testing and Materials:

ASTM C 603‑90 Test Method for Extrusion Rate and Application Life of
Elastomeric Sealants

ASTM C 639‑90 Test Method for Rheological (Flow) Properties of
Elastomeric Sealants

ASTM C 661‑93 Test Method for Indentation Hardness of Elastomeric‑Type
Sealants by Means of a Durometer

ASTM C 679-87 Test Method for Tack‑Free Time of Elastomeric Sealants (r
1992)

ASTM C 719‑93 Test Method for Adhesion and Cohesion of Elastomeric Joint
Sealants Under Cyclic Movement

ASTM C 790‑90 Standard Guide for Use of Latex Sealants

ASTM C 792‑93 Test Method for Effects of Heat Aging on Weight Loss,
Cracking, and Chalking of Elastomeric Sealants (R 1987)

ASTM C 793‑91 Test Method for Effects of Accelerated Weathering on
Elastomeric Joint Sealants

ASTM C 794‑93 Test Method for Adhesion‑in‑Peel of Elastomeric Joint
Sealants

ASTM C 834‑91 Latex Sealants

ASTM C 920‑87 Elastomeric Joint Sealants

1.3 SUBMITTALS:

A. General: Submittals shall be according to \[Section 01009 - General
Information and Requirements.\] \[and\] \[Section 01300 ‑ Submittals.\]
\[and\] \[Section 01365 ‑ Certificates of Conformance.\]

B. Manufacturer\'s Literature: Submit \[[ ]{.underline}\] copies of the
manufacturer\'s descriptive data for each type of caulking compound or
sealant, joint primer, and backing material to be used on this project.
Data which describe more than one type shall be clearly marked to
indicate which type the Contractor intends to provide. Data shall be
sufficient to show conformance to specified requirements.

C. Certificates of Conformance: Prior to delivery of materials, submit
\[[ ]{.underline}\] copies of written certification from the
manufacturer attesting that materials to be used on this project, except
for those specified to bear markings or statements, meet the
requirements of these specifications.

D. Samples: Submit a sample of each type of joint to be caulked. The
sample shall show the workmanship, bond, and color of caulking material.
The workmanship, bond, and color of caulking work throughout the project
shall match that of the approved sample joint.

1.4 QUALITY ASSURANCE:

A. ab Labeling Requirments: Cartridges shall bear manufacturer\'s
identification.

B. Failure Criteria: Not limited to the following:

1\. Separation of sealant or caulking from wall of joint.

2\. Hardening of sealant or caulking causing cracking.

3\. Staining of materials forming joint.

1.5 PROJECT AND SITE CONDITIONS:

A. Environmental Conditions: The air temperature shall be between 40 and
90 degrees F when the sealants and caulking are applied.

[PART 2: PRODUCTS]{.underline}

2.1 MATERIALS:

A. Exterior Sealant: One‑part silicone rubber. Shall be according to
ASTM C 920, Type S, Grade NS, uses M, G, and A (single-component, nonsag
for masonry, glass, and aluminum). A single-component, chemically curing
sealant shall be a homogeneous mixture of consistency suitable for
immediate application by hand, pressure caulking gun or by hand tool.
The sealant, when completely cured, shall form an elastomeric solid,
capable of maintaining a seal against gases, liquids, and solids.
Sealant shall be according to ASTM C 603, ASTM C 639, ASTM C 661, ASTM
C 719, ASTM C 793, and ASTM C 794.

B. Interior Caulking: Acrylic latex caulk, according to ASTM C 834.

C. Primer for Elastomeric Sealants: Quick‑drying type and the
consistency shall be according to manufacturer\'s written instructions.

D. Bond Breakers: Of the type and consistency recommended in
manufacturer\'s written instructions.

E. Backstops: Fiberglass roving, or neoprene, butyl, polyurethane,
vinyl, or polyethylene foams free from oil or other staining elements.
Oakum and other types of absorptive materials shall not be used.

[PART 3: EXECUTION]{.underline}

3.1 PREPARATION:

A. Protection: Areas adjacent to joints to be filled shall be protected
from smearing by the compound.

B. Surface Preparation: Clean, dry to the touch, free from frost,
moisture, grease, oil, wax, lacquer, paint, or other foreign matter that
would destroy or impair adhesion. Joints shall be enclosed on three
sides.

1\. Ferrous Metals: Clean of rust, mill scale and coatings by wire
brush, grinding, or sandblasting. Remove oils and grease with suitable
solvent.

2\. Wood: Prime it using a product identified by the sealant
manufacturer and apply according to the manufacturer\'s directions.

3\. Primer: Loose particles shall be cleaned out just prior to caulking
and grooves given a uniform coating of primer. Primer shall not be
applied to exposed finish surfaces.

3.2 INSTALLATION AND APPLICATION:

A. General: Caulking compound shall be compatible with the material to
and against which it is applied, and shall be of the nonstaining type.
Application of compound around openings shall include the entire
perimeter of each opening. Do not disturb sealed joint for 48 hours. The
compound shall be applied according to the manufacturer\'s written
instructions, using a caulking gun with a nozzle of proper size to fit
the joint width. The compound shall be forced into grooves with
sufficient pressure to fill the joints solidly. Compound shall be
uniformly smooth and free of wrinkles, and unless indicated otherwise,
shall be tooled as necessary and left sufficiently convex to result in a
flush joint when dry. Where the use of a caulking gun is impracticable,
suitable hand tools may be used.

1\. Interior Caulking: Provide interior caulking at all open joints
exposed on the interior of the building and at interior joints indicated
to receive sealant or caulking.

2\. Exterior Sealant: Provide exterior sealant at joints around the
perimeter of openings and at open joints exposed on the exterior of the
building to provide water and weathertight construction, and at exterior
joints indicated to receive sealant.

3\. Joint Depth: Joints more than 1/2 inch deep shall be filled to
within 1/2 inch of the surface with a non‑adhering backstop as specified
above.

B. Tooling: When necessary, joint shall be tooled within 10 minutes of
application using a regular caulking tool or a soft‑bristled brush
moistened with solvent.

C. Freshness: Sealants or caulking compound more than 6 months old shall
not be used. The compound shall not be used when it becomes too gelled
to be discharged in a continuous flow from the gun. Modification of the
compound by the addition of liquids, solvents, or powders will not be
permitted.

D. Painting: Do not paint sealants or caulking.

3.3 CLEANING:

A. Requirements: Fresh compound that has been accidentally smeared shall
be scraped off immediately and rubbed clean with a solvent as identified
by the sealant manufacturer. Remove excess sealant from nonporous
surfaces before curing by using a commercial solvent. Allow porous
surfaces‑allow to cure and remove by abrasion or other mechanical means.
Upon completion of application of compound, remove smears, stains, and
other soiling.

[PART 4: MEASUREMENT AND PAYMENT]{.underline}

4.1 METHOD OF MEASUREMENT:

A. Units: The work described in this section will not be measured for
payment.

4.2 BASIS OF PAYMENT:

A. Payment: No direct payment for the work described under this section
will be made. The Contractor shall include consideration for this item
in the bid price for other items of the Contract.

END OF SECTION