Clean and Seal Masonry Surfaces

A. Finished-Project Specification

Deliverable: one cured masonry practice surface that has been identified, tested in an inconspicuous area, cleaned using the least aggressive compatible method, rinsed and dried, inspected for color change and defects, and sealed only where the approved design and moisture condition permit it, with a complete written record of tests, cleaner, dilution, runoff containment, sealer, weather, and results.

B. Cleaning and Sealing Item Schedule

Item	What Is Evaluated	Tool or Method	Recorded Result
Surface identification	Unit type, mortar, age, finish, stain, efflorescence, prior sealer, moisture source	Visual, moisture meter, drawing or record review	Identified list with description and photo reference
Cure confirmation	Elapsed cure time since completion of the surface	Project record review	Pass / Insufficient, with date confirmed
Moisture source	Active water entry affecting the surface	Visual, moisture meter	Corrected / Not corrected — Stop-Work if not corrected
Test area	Selected cleaner performance on an inconspicuous area	Spray bottle, brush, rinse, dry, visual comparison	Accepted / Rejected, with photo reference
Full-surface cleaning	Dilution, dwell time, agitation, rinse pressure, containment	Sprayer, nonmetallic brush, low-pressure rinse	Pass / Deficient, with description
Drying confirmation	Moisture content before sealer decision	Moisture meter	Dry / Not dry — hold for sealer decision
Sealer decision	Approved design permission and moisture condition	Design review, moisture meter	Approved / Not approved, with reference
Finished-surface inspection	Color change, etching, streaking, residual salts, joint damage, blocked drainage	Visual, photo	Pass / Deficient, with photo reference

C. Documentation Requirements

• Photographs: at least one photograph of the surface before cleaning, the test area after rinsing and after drying, the full surface after cleaning, and the finished surface after any sealer application.
• Product references: the manufacturer name, product identification, dilution ratio, dwell time, agitation method, rinse method, and coverage rate used for every cleaner and sealer applied.
• Runoff and containment record: the containment method used and the confirmed discharge point for wash water and runoff.
• Weather record: temperature, precipitation, and wind conditions during cleaning and, where sealer is applied, during application and cure.

D. Acceptance Standards

Check	Standard
Cure before cleaning	Mortar has cured for the manufacturer- or code-required minimum period before any cleaner is applied; if the period is undocumented, record the surface as not ready and wait rather than estimating a cure date
Active moisture	No active water entry is present at the time of cleaning; any identified active source is corrected and confirmed dry before cleaning proceeds
Test-area result	No color change, etching, streaking, or joint damage visible after the test area is fully dry; a test area with any of these defects is rejected and a less aggressive method is tested next
Full-surface cleaning	Cleaner applied at the specified dilution and dwell time, agitated only with compatible nonmetallic tools, and rinsed thoroughly at controlled pressure with no cleaner allowed to dry on the surface
Runoff containment	Wash water and runoff directed to an approved discharge point with no cleaner, rinse water, or slurry entering a storm drain, planting bed, or neighboring property
Drying before sealer	Masonry confirmed dry by moisture meter before any sealer decision is made
Sealer approval	Sealer applied only when the approved design and current moisture condition permit it; sealer is never used to correct missing flashing, failed drainage, active moisture entry, incompatible mortar, or structural cracking
Drainage preservation	Weeps, movement joints, and drainage details remain open and unobstructed after cleaning and sealing; any blocked detail is a Deficient finding requiring correction before closeout

E. Surface Identification and Cure Confirmation

1. Identify unit type, mortar, age, finish, stain, efflorescence, previous sealer, moisture source, and cleaning limits. Record every item on the Surface Identification Record before selecting a cleaning method.
2. Confirm mortar has cured for the required period. Check the project record for the completion date and compare it against the manufacturer- or code-required minimum cure period.
3. Correct active water entry before cleaning or sealing. If an active source is identified, stop and correct it under the applicable earlier chapter or a qualified professional's scope before proceeding.

F. Method Selection and Test Area

1. Select dry brushing, low-pressure water, detergent, proprietary cleaner, or another approved method. Record the selected method and the reason it is the least aggressive option expected to be effective.
2. Do not begin with strong acid, high pressure, sandblasting, or aggressive abrasion. Confirm the selected method is not one of these before proceeding.
3. Prepare a small inconspicuous test area. Select a location representative of the full surface but not prominent if a defect occurs.
4. Protect windows, metals, roofing, siding, paving, plants, soil, and drainage. Install plastic sheeting and containment before mixing any cleaner, even for the test area.
5. Establish runoff and wash-water containment. Confirm the containment berm, absorbent sock, or approved discharge point is in place.

G. Cleaning, Rinsing, and Drying

1. Remove loose surface deposits using a dry or controlled method. Brush or vacuum loose material before applying any liquid cleaner.
2. For efflorescence, identify and reduce the moisture source. Record the identified source and the correction taken or referred.
3. Brush or clean salts using the compatible method. Use a nonmetallic brush and the selected cleaner at the specified dilution.
4. For mortar smears, allow sufficient cure before cleaning. Confirm the smear area meets the same cure-period standard as the surrounding surface.
5. Prewet masonry where the cleaner requires it. Follow the manufacturer instruction for prewetting before cleaner application.
6. Apply cleaner at the specified dilution and dwell time. Record the exact dilution ratio and start and stop time of the dwell period.
7. Agitate only with compatible brushes or pads. Do not use metal brushes, scrapers, or abrasive pads unless specifically approved for the unit type.
8. Rinse thoroughly at controlled pressure. Use low-pressure water and confirm no cleaner residue remains using pH test strips where applicable.
9. Prevent cleaner from drying on the surface. Rinse before the dwell time is exceeded and before the cleaner begins to dry.
10. Allow masonry to dry fully. Confirm dryness with the moisture meter before proceeding to inspection or the sealer decision.

H. Test-Area Review and Full-Surface Cleaning

1. Inspect for color change, etching, streaking, residual salts, and joint damage in the test area. Photograph the dry test area and compare it against the untreated surrounding surface.
2. Accept or reject the test-area result. If rejected, select a less aggressive method or product and repeat the test area before proceeding to full-surface cleaning.
3. Repeat the accepted method across the full surface. Apply the same dilution, dwell time, agitation, and rinse procedure used in the accepted test area.

I. Sealer Decision, Application, and Final Inspection

1. Apply sealer only when the approved design and moisture condition permit it. Confirm the design document specifically authorizes sealing before proceeding; if no such authorization exists, do not apply sealer.
2. Select breathable penetrating sealer or other specified product. Confirm the product is identified as compatible with the unit type and mortar in the approved design or manufacturer literature.
3. Apply at the controlled coverage without puddles or glazing. Follow the manufacturer coverage rate and application method.
4. Preserve weeps, movement joints, and drainage. Mask or otherwise protect these details from sealer contact during application.
5. Protect through cure. Follow the manufacturer cure period and protect the surface from rain, foot traffic, or contamination during that period.
6. Inspect appearance, repellency indicators, breathability indicators, overspray, and blocked details. Confirm no detail has been coated or obstructed.
7. Document tests, cleaner, dilution, runoff, sealer, weather, and results. Complete the full documentation record before closing out the chapter.