How to Spray Paint in Occupied Buildings Without Disrupting Business

As a commercial painter, an ideal situation may be a new build that is empty, prepped, and ready to go. So what if this will not be an option? Businesses that are already open may not have the option to close down completely, if at all.  In this blog, we will discuss some best practices when it comes to working around an active business environment and still provide great customer service and impeccable paint application.

OSHA Indoor Air Quality Standards for Painting:

While OSHA has no single, overarching "indoor air quality" standard, it does strictly regulate air quality during commercial interior painting. Employer must protect their workers from toxic vapors (VOC's), combustible fumes, and particulate dust by enforcing specific permissible exposure limits (PEL's). Here are the 5 Standards OSHA requires:

Ventilation and Combustible Vapor Limits - During indoor painting, especially with solvent-based coatings, ventilation is strictly controlled to prevent explosions and hazardous breathing environments. Mechanical ventilation must keep solvent vapor concentrations below 10% of the LEL (Lower Explosive Limit). If levels reach or exceed this, all painting must stop, and the area will require immediate evacuation. Enclosed areas also require active mechanical exhaust utilizing explosion-proof commercial fans to ensure that proper air exchange is happening while the paint dries.

Permissible Exposure Limits (PEL's) - OSHA enforces legal limits on the amount of specific chemicals and dusts that workers can breathe over an 8-hour shift. Always make sure to review your SDS of the specific paint to identify the chemicals and ensure exposure remains below the OSHA-mandated PEL.

Common exposure limits for commercial painting include:

• Acetone: 1,000ppm
• Toluene: 200ppm
• Methylene Chloride: 25ppm

Respiratory Protection - When ventilation is insufficient to lower airborne toxins and dust BELOW the legal PEL, employers are required to implement a comprehensive respiratory protection program. This includes a fit test for your workers, which will require a medical evaluation prior to using a respirator and being provided with a proper respirator mask. Depending on the paint's toxicity, works may require particulate filter masks, organic vapor cartridges, or supplied-air respirators.

Hazard Communication - Under OSHA Hazard Communication Standards, employers must ensure that SDS's for all paints and thinners are readily accessible to their workers. Containers must be clearly marked and labeled at all times. Workers must also be trained on the specific health hazards associated with all materials they will be handling during any given project.

Commercial Spray Painting Specifics - If you are performing indoor spray painting of any kind, you must adhere to rigid booth regulations. Spray areas require dedicated, grounded exhaust systems to safely remove fumes and prevent the buildup of flammable deposits. Regardless of the approved OSHA method you choose to utilize, all ventilation and exhaust methods on a commercial spray painting site must also adhere to the National Fire Protection Association's codes NFPA33 and NFPA91.

1. NFPA33 -This standard code specifies ventilation rate, interlocks, and exhaust clearance heights to prevent fire hazards.
2. NFPA91 - This standard code governs the actual construction of the exhaust system ducts, detailing the use of galvanized steel or aluminum, safe duct diameters, and clearance requirements.

How to Paint Occupied Office Spaces:

Paint Phasing and Scheduling Best Practices. Effective commercial paint scheduling balances minimizing business disruptions with maximizing crew productivity. The most successful projects utilize a phased approach. This includes dividing the space into logical zones, scheduling work during after-hours if possible, and specifying low-odor and quick-drying materials. This ensures that daily operations for the business can continue with minimal downtime. Let's break it down!

1. Phasing Strategy - Breaking large commercial spaces into more manageable, compartmentalized zones is essential for maintaining business continuity. This could include Sectional Phasing, which only shuts one area down at a time and can be used alongside possible remote work; or Vertical/Horizontal Phasing, which is commonly used in multi-floor structures, allows for planned temporary closures with a more exact time frame. Buffer Zones can also be used between active painting zones and occupied work areas to prevent further disruptions due to noise, fumes, and dust.
2. Scheduling Windows - It is always good to align your project timeline with the natural rhythm and traffic patterns of your facility to mitigate impact. When scheduling or planning the dates with your customer, discuss options like working off-hours or overnight, over the weekend, or even if shutdown periods are approaching, such as holidays or temporary closures for summer break.

Airless Vs. HVLP Paint Sprayers for Indoor Use:

The Best Commercial Airless Paint Sprayers? Choosing Airless sprayers for large indoor projects, like entire walls or ceilings, is a great option. They deliver paint rapidly at high pressure. HVLP (High Volume, Low Pressure) sprayers for fine indoor finishes on cabinets, doors, and trims. They operate at lower pressure, offering maximum control and a smoother finish with less paint waste.

Airless Sprayer Highlights

Use extreme hydraulic pressure to force paint through a small tip, atomizing it purely via pressure.

• Best Uses - Full rooms, newly built framing, walls, and ceilings
• Speed - High Productivity
• Drawbacks - HEAVY OVERSPRAY. The high pressure causes a significant amount of paint dust due to float and bounce, which means you will spend a considerable amount of time masking floors, windows, and furniture. They also impose a fluid injection safety hazard if misused.
• Cleanup - More time-consuming as you must flush long hoses and the high-pressure pump system thoroughly after every use!

HVLP Sprayer Highlights

They use a high volume of air at very low pressure to push and gently atomize paint

• Best Uses - Kitchen Cabinets, furniture, crown molding, and trim due to the low overspray.
• Speed - Slower than Airless, but faster than hand rolling or brush painting.
• Drawbacks - slower application speeds. Thicker paints, like a standard interior latex paint, usually will need to be thinned with water or a specific conditioner so they can pass through the small nozzle.
• Cleanup - Generally, a faster cleanup and easier because the material cups are smaller and there are no long hoses to flush.

Best Commercial Spray Paint to Use for an Occupied Commercial Space

• Zero-VOC Spray Paint - Zero-VOC spray paint for commercial use contains minimal to no volatile organic compounds. This allows businesses to complete touch-ups, stenciling, or refinishing indoors without evacuating the building or halting daily operations. Because there are virtually no off-gassing fumes, employees, customers, or tenants don't need to relocate. This type of paint also helps commercial facilities meet indoor air quality requirements and LEED environmental standards. Zero VOS spray paints prevent the strong, lingering odors of traditional solvent-based paints that can trigger migraines, asthma, or other chemical sensitivities.
• Industrial Dryfall Paint - Industrial dryfall paint is a specialized, fast-drying commercial coating designed for high-ceiling environments like warehouses and manufacturing plants. Any overspray dries into a dust-like powder before hitting the floor, allowing crews to simply sweep up the mess instead of having to painstakingly tape and drape the entire facility. This type of paint can be applied via industrial airless paint sprayers to cover expansive overhead surfaces in a fraction of the time required for rolling or brushing. This type of paint is best for warehouse ceilings and roof decks, ductwork or piping, open concept spaces, and even exterior applications.
• Sugar Spray Paint - Sugar Spray Paint is an eco-friendly, low-VOC aerosol paint that uses a sugarcane and alcohol-based solvent rather than petroleum. While high favored for projects like indoor murals, workshops, and delicate canvases due to their low odor and high opacity, they are generally too low-pressure and slow drying for heavy duty commerical or industrial applications. Due to the solvents being alcohol and water-based, these paints do not perform well in cold or wet weather conditions. While they have ultra-low VOCs, wearing a respirator is still recommended for prolonged, commercial-style spraying in enclosed areas.

So, to recap. Check your SDS and OSHA guidelines. Approach the customer with a plan to minimize their downtime, if any. Communicate project plans and timelines to your team. Select the best Sprayer for the area you will be working in, along with the most appropriate paint. And last, but not least, ALWAYS ensure that you and your team have the correct PPE and effective ventilation before any project.

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