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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

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 [      ] 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, boldface, and italics within the paragraphs; and this page.  (Open Reveal Codes [alt F3] to do this accurately).

D.	To Edit “(Footer B)”: (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

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

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

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

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