04 01 20 - Masonry Cleaning.pdf
PDF 466 KB Posted
- Attached to
- West Pump Station Replacement Project
- Solicitation number
- Not on record
- Issued by
- Chester County, Pennsylvania
About this file
This is a Unit Masonry Cleaning specification document for the West Pump Station Replacement Project managed by Northwestern Chester County Municipal Authority in Pennsylvania. The specification outlines the requirements for cleaning unit masonry surfaces as part of the general construction contract (WPS-1). The work includes the removal of mortar and grout stains, efflorescence, and other new construction stains from newly installed masonry units using approved cleaning solutions. Acceptable cleaning products are limited to detergent-type solutions, with Pro So Co and Diedrich Technologies, Inc. identified as approved manufacturers. The specification requires that masonry cleaning commence no earlier than seven days after completion of masonry work and mandates the use of specific application methods, including fibered wall-washing brushes, wooden paddles, and pressurized water for rinsing. All cleaning must be performed on exposed-to-view masonry surfaces with protection of adjacent surfaces from potential damage caused by cleaning solutions.
The cleaning process must adhere to manufacturer recommendations regarding solution dilution and neutralizing rinses. If project conditions require a cleaning solution strength exceeding 5 percent acid concentration, the contractor must obtain written permission from the CMU manufacturer and provide documentation to the Engineer prior to application. The specification prohibits the use of wire brushes and requires that all tools be free of rust to prevent surface damage. The work includes thorough rinsing with pressurized water and application of neutralizing rinse as recommended by the cleaning product manufacturer. No pricing, set-asides, or funding information is provided in this specification document.
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Text version
04 01 20 – UNIT MASONRY CLEANING
Herbert, Rowland & Grubic, Inc. 04 01 20 - 1 000483.0450
SECTION 04 01 20 – UNIT MASONRY CLEANING
PART 1 - GENERAL
1.01 SUMMARY
A. Section includes:
1. Masonry cleaning.
PART 2 - PRODUCTS
2.01 ACCEPTABLE MANUFACTURERS
A. Subject to compliance with the Contract Documents, the following manufacturers are acceptable:
1. Cleaning solution: Detergent type.
a. Pro So Co.
b. Diedrich Technologies, Inc.
2.02 MATERIALS
A. Proprietary Acidic Cleaner: Manufacturer’s standard-strength cleaner designed for removing mortar/grout stains, efflorescence, and other new construction stains from new masonry without discoloring or damaging masonry surfaces. Use product expressly approved for intended use by cleaner manufacturer and manufacturer of masonry units being cleaned.
B. Detergent-Type Cleaning Solution:
1. Similar to Pro So Co. “Sure Clean #600” detergent masonry cleaner.
C. Water: Potable.
D. Neutralizing rinse as required by manufacturer.
2.03 MIXES
A. Dilute cleaning solution with potable water at rate which will provide for the weakest solution allowable for cleaning wall.
04 01 20 – UNIT MASONRY CLEANING
Herbert, Rowland & Grubic, Inc. 04 01 20 - 2 000483.0450
B. If project conditions require solution of greater than 5 percent acid obtain permission from CMU manufacturer and provide documentation to Engineer prior to applying solution to wall surface.
PART 3 - EXECUTION
3.01 PREPARATION
A. Allow seven (7) days after completion of masonry work before start of cleaning.
B. Remove excess mortar using wooden paddles and scrapers.
C. Protect adjacent surfaces not to be cleaned.
3.02 APPLICATION
A. Protect adjacent surfaces subject to potential damage by cleaning solution.
B. Apply masonry cleaner to exposed-to-view masonry surfaces.
1. Do not use wire brushes.
2. Use only tools free of rust.
3. Apply solution using fibered wall-washing brush.
C. Thoroughly rinse and pre-soak brush.
D. Flush all loose mortar and dirt from surface.
E. Wet to prevent “run-off” streaking.
F. Scrape off mortar and reapply cleaning solution.
G. After scrubbing, clean thoroughly with pressurized water.
H. Apply neutralizing rinse as recommended by manufacturer.
END OF SECTION 04 01 20
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