2026 Mille Lacs County Justice Center & NMF Sealant Project

2026-11-03

PRODUCTS Clean , potable water EQUIPMENT 5 Power Wash Sprayer with 25 ° Nozzle EXECUTION • Power Washing is specified to remove surface dirt and foreign materials from stone masonry surfaces . The intent of this specification is not to substantially change the appearance of the masonry but to remove such surface staining , which can be removed without the use of chemicals or abrasives . • Water washing should begin at 100 psi and may be increased in small increments if necessary but not to exceed 400 psi . • Exterior stone masonry surfaces will be washed with pressurized water spray . • All necessary shields , barriers , glass protection , or other precautions to properly execute this work without damage to the surrounding area will be supplied . • Allow moisture to fully dry before adding mortar or caulking . • In accordance with the Secretary of Interior ’ s Standards for Rehabilitation . • For additional guidelines , please refer to Preservation Brief 1 : Assessing Cleaning and WaterRepellent Treatments for Historic Masonry Buildings , https :// www . nps . gov / tps / how - to - preserve / briefs / 1 - cleaning - water - repellent . htm

Minnesota

2026-04-29