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READ AND REMOVE THIS OUTLINE GUIDE BEFORE PLACING

THE SPECIFICATION SECTION IN THE CONTRACT

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O U T L I N E G U I D E

[DIVISION 4: MASONRY]{.underline}

SECTION 04521 - REPOINTING HISTORIC MASONRY

USE: Furnishing mortar for masonry work specified.

**NOTES TO SPECIFIER:**

A. Options within paragraphs are identified by enclosure in brackets;
blank spaces enclosed by brackets \[[ ]{.underline}\] 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/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 specifications 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) 987-6851.

F. DESIGN NOTES:

1\. **DRAWING DATA REQUIRED:**

a\. Show joint finishing/tooling.

b\. Expansion joints showing backer rod and sealant.

**REVISIONS OF THIS SECTION:**

CSI format, editorial changes 11/99

Metric: Not Applicable

Technical Update: 12/99

SECTION 04521

REPOINTING HISTORIC MASONRY

[PART 1: GENERAL]{.underline}

1.1 SUMMARY

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BRIEFLY DESCRIBE, IN GENERAL TERMS, WHAT THE WORK OF THE SECTION
INCLUDES.

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A. Section Includes: Furnishing mortar for masonry work specified in
other sections.

B. Related Sections

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LIST ITEMS OF WORK THAT MIGHT LOGICALLY BE FURNISHED AND INSTALLED UNDER
THIS SECTION, BUT INSTEAD ARE SPECIFIED IN ANOTHER SECTION. THIS ARTICLE
IS RARELY REQUIRED.

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1.2 SUBMITTALS

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SUBMITTALS SHOULD ONLY BE REQUIRED IF JUSTIFIED. UNJUSTIFIED SUBMITTALS
CREATE A BURDEN FOR THE CONTRACTOR AND THE PROFESSIONAL REVIEWING
SUBMITTALS. SECTION 01330 - SUBMITTAL PROCEDURES DESCRIBES THE QUANTITY
AND METHOD OF SUBMITTALS. IF A PRODUCT IS SPECIFIED BY BRAND NAME,
USUALLY NO SUBMITTALS ARE REQUIRED; SECTION 01330 - SUBMITTAL PROCEDURES
ADDRESSES SUBMITTAL REQUIREMENTS FOR APPROVED EQUALS, AND ALSO ADDRESSES
SUBMITTALS FOR INSTALLATION INSTRUCTIONS.

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A. As specified in Section 01330 - Submittal Procedures.

B. Samples: Dry mortar materials and cured mortar samples of proposed
mix(es).

C. Certificate: Manufacturer\'s certification that materials and
products meet specified requirements.

1.3 TESTING

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LIST TESTS REQUIRED ON-SITE OR ON MATERIALS TAKEN FROM THE SITE. MAKE
CLEAR WHETHER THE CONTRACTOR OR THE GOVERNMENT ARRANGES AND PAYS FOR THE
TESTS.

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A. Tests: Reports of tests conducted by an independent testing
laboratory certifying that mortar meets specified requirements. Testing
will be at no additional expense to the Government.

1.4 PRODUCT HANDLING

A. Delivery: Deliver materials in manufacturers\' original, unopened,
protective packaging.

B. Storage: Store cementitious materials in a dry area, under cover, and
off the ground.

1.5 PROJECT CONDITIONS

A. ENVIRONMENTAL CONDITIONS

1\. Do not place mortar when temperature is below 40 degrees F unless
approved means are provided to heat sand or water and ensure that mortar
will harden without freezing.

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STATE ANY PHYSICAL OR ENVIRONMENTAL LIMITATIONS SUCH CONDITIONS MIGHT
INCLUDE TEMPERATURE, WEATHER, HUMIDITY, VENTILATION, AND ILLUMINATION
REQUIRED FOR PROPER INSTALLATION OR APPLICATION.

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B. EXISTING CONDITIONS

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LIST UNUSUAL EXISTING CONDITIONS NOT SHOWN SUCH AS MAY BE FOUND IN
RESTORING AN HISTORIC BUILDING. THIS ARTICLE IS ALSO USED FOR
REFERENCING SOILS REPORTS.

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[PART 2: PRODUCTS]{.underline}

2.1 MORTAR MATERIALS

A. Portland Cement: ASTM C150‑92, Type I, white.

B. Lime: ASTM C207‑91, Type S.

C. Aggregates: ASTM C144‑93.

D. Water: Clean and potable.

E. Color: For exposed work, match existing. Obtain color from sand.
Pigment is not permitted.

2.2 MORTAR PROPORTIONS (MEASURED BY VOLUME)

A. Setting or Repointing Historic Masonry Above Grade: Use or adjust one
of the following mixes which will best match the texture, color, and
appearance of the historic mortar.

1\. 1 part portland cement, 4 parts lime (sifted), 8 parts sand, 1 part
ground oyster shells.

2\. 1 part portland cement, 4 parts lime.

[PART 3: EXECUTION]{.underline}

3.1 MIXING POINTING MORTAR

A. Mix all materials as dry as can be handled in a mechanical mixer
until thoroughly combined. Just before pointing, add only enough water
to make mortar workable. Use mortar within 1-1 1/2 hours after adding
water.

3.2 MIXING SETTING MORTAR

A. While mixer is in operation, add three-fourths of the required water,
one half of the sand, and all of the lime and cement; then the remainder
of the sand. Allow batch to mix briefly; add water in small quantities
until mortar is of a workable consistency. To ensure complete hydration,
mix for a minimum of 10 minutes after adding all materials. If mortar
begins to stiffen, retemper immediately by adding water and remix. When
air temperature is 80 degrees F or higher, use mortar within 1‑1/2
hours; under 80 degrees F, use within 2 hours. Discard remaining mortar.
Retempering within these time limits will be permitted only as necessary
to maintain workability. Use no calcium admixtures or antifreeze
chemicals.

3.3 PLACING MORTAR

A. Setting Masonry: fill joints between masonry completely with mortar.
Form head joints by applying a full coat of mortar on the unit to be
laid.

B. Pointing Masonry: Press mortar into joint with pointing tool, being
careful to keep mortar off the exposed surfaces of the masonry units.
Use a mortar bag to apply mortar into joints when mortar cannot be
effectively transferred to joint without soiling the face of the masonry
units.

3.4 CLEANING

A. Protection: Protect work which may be damaged, stained, or discolored
during cleaning operations.

B. Repointing: Upon completion of masonry work, cut out defective mortar
joints and tuck point joints and all holes solidly with prehydrated
mortar.

C. Cleaning: Clean exposed masonry surfaces with clear water and stiff
fiber brushes and rinse with clear water. Where stains, mortar, or other
soil remain, continue cleaning with warm water and detergent.

3.4 PROTECTION

A. Cold Weather Protection: Protect masonry from rain and snow by
covering with weather-resistive membrane for 24 hours after laying.

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

4.1 METHOD OF MEASUREMENT

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WHEN A "LUMP SUM" CONTRACT IS USED, DELETE THE TITLE "PART 4:
MEASUREMENT AND PAYMENT" AND BOTH ARTICLES FROM THIS SECTION.
MEASUREMENT AND PAYMENT WILL BE ADDRESSED IN PART 4 OF SECTION 01009 -
GENERAL INFORMATION AND REQUIREMENTS OR SECTION 01010 - SUMMARY OF WORK.

WHEN NOT A "LUMP SUM" CONTRACT, SELECT APPLICABLE PHRASES; USE THE "NO
MEASUREMENT" PHRASE WHEN THE PAY ITEM IN THIS SECTION IS NOT INCLUDED IN
THE BID SCHEDULE.

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A. Units: The work described in this section will \[not be measured for
payment\] \[be measured and paid for on a lump sum basis\].

4.2 BASIS OF PAYMENT

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WHEN NOT A "LUMP SUM" CONTRACT, SELECT APPLICABLE PHRASE; USE THE "NO
DIRECT PAYMENT" PHRASE WHEN THE PAY ITEM IN THIS SECTION IS NOT INCLUDED
IN THE BID SCHEDULE.

WHEN NOT A "LUMP SUM" CONTRACT AND PAYMENT IS TO BE MADE UNDER THIS
SECTION, SELECT THE PAY ITEM. DO NOT CHANGE PAY ITEM NUMBER.

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

04521(01) Masonry Lump Sum

END OF SECTION