How Do Contractors Control Dust on Construction Sites? 7 Methods That Work

How to control the dust on-site from water suppression to HEPA vacuum and how to budget for it before bidding.

The Short Answer
On construction sites, water suppression, source-capture equipment (including saws fitted with dust shrouds and HEPA vacuums), physical barriers, good housekeeping, and respiratory protection are used by contractors to control dust. The best method is to prevent the occurrence of dust in the first place and only wear masks as a final barrier. From the beginning, dust management should also be part of the project cost.

The need to control dust is not an option; it is a duty we must fulfill.

First, if you're interested in how contractors manage dust on construction jobs, ask yourself: why do they need to? The exposure to respirable crystalline silica, a fine dust released during cutting, grinding, or drilling of concrete, brick, stone, and tile, is a risk for the development of conditions such as silicosis, lung cancer, and other serious diseases.

The figures are shocking. According to OSHA, approximately 2.3 million workers in the United States are exposed to respirable crystalline silica, approximately 2 million of which are in construction activities, and the silica rule is preventing more than 600 deaths and more than 900 new cases of silicosis each year (OSHA silica overview). The UK HSE has established a workplace exposure limit of 0.1 mg/m³ for RCS for an eight-hour shift (HSE construction dust guidance).

In addition to health issues, poor dust control allows for neighbors to complain, fines, stop work orders, equipment filters clogging, and damaged finishes. A dustless place is a place that pays back later.

1. Water Suppression

Water is the most traditional and prevalent instrument. Wet dust particles become heavy and fall.

Water trucks and water sprays on haul roads and bare ground, misting cannons over demolition areas, and water attachments on saws, grinders, and drills are other ways in which contractors use water. It's a matter of the balance. The dust continues to fly when there is too little water. Excessive amounts will cause mud and runoff and create slippery roads. Spend a few minutes adjusting spraying to the job in process, wind and temperature.

2. Source Capture with Right Tools

The best way to control dust is to not let it escape! With today's technology, this is achievable:

1. Built-in dust shrouds on saws, grinders, and drills that are coupled to HEPA vacuums.
2. For concrete, tile, and masonry, wet-cutting is used.
3. To use a vacuum to remove and break apart soil for extraction.

OSHA's construction standard for silica exposure even includes a list of tools and the controls used with them in the U.S.—so contractors don't have to guess.

3. Barriers and Containment

When it is not possible to completely prevent dust from occurring, contractors try to prevent it from moving. Wind breaks and dust control netting reduce wind speed over an exposed area. The spaces within the building are plastic sheeted and zip-walled, an important factor in occupied homes, schools, and hospitals. Negative air machines, which use HEPA filters, extract air from a confined space, preventing dust from entering clean spaces.

4. Good Housekeeping
There is more dust control discipline than you think:

1. In addition, wet sweeping or HEPA vacuuming rather than dry sweeping or compressed air.
2. Wrap sand, soil, and debris piles with covers to prevent them from drying out, becoming compacted, and blowing away easily.
3. Roads that are washed by trucks and rumpled to prevent dirt from being spread on public roads
4. The use of covered loads and low speed on-site limits.
5. Drop-through chutes, which are enclosed, are used to drop debris from above.

5. Smart Scheduling

Sage crews plan for dusty jobs around the weather. On days when the wind isn't too high, the excavation and demolition process continues. Once the wind starts, they stop, add water, or change their task. It is inexpensive and eliminates most of the complaints.

6. Protecting the Crew

With good controls, there may be some exposure. That's where respirators (N95 or better if the hazard) sealed goggles, training, and air monitoring come into play. PPE is at the bottom of the hierarchy of controls because it provides the most basic protection for the person wearing the mask, whereas engineering controls protect everyone around them.

7. A written dust control plan is required.

On larger projects, contractors outline the plan prior to the beginning of the work: primary dust sources, controls selected, who will be responsible, monitoring and tracking, and what will be done if the limits are exceeded. It ensures that crews are locked in and demonstrates to clients and inspectors that dust was anticipated, not ad hoc.

The cost of dust control is not clearly defined.

This will depend on the size and type of the site, the type of soil, the climatic conditions, and the nature of the work. The most common line items are:

1. Water Truck or water sprayer hire and water supply
2. HEPA vacuums and dust-shroud tools
3. Barriers, netting, sheeting, and negative air machines.
4. Additional cleaning and supervision staff requirements.
5. Preparing the washing station and cleaning the roadway.
6. The respirators, goggles, and training are available.
7. Air monitoring and compliance reporting. Many bidders tend to either overlook these costs or include them under the general overhead. Then it starts to work; the water truck comes out, and the margin gets smaller.

Integrate dust control into your estimate.

The solution is to quote the dust control line by the line, just like concrete or labor. A detailed estimate makes it possible to place a competitive bid without risking your profits.

At Design Estimation, we do just that. We provide comprehensive construction cost estimates, taking into consideration actual site conditions, safety requirements, materials, labor and equipment used by the contractors, builders, and owners. If dust control is in the numbers right from the beginning, there are no unexpected budget busters and smoother approvals.

Frequently Asked Questions

So, what do you think is the best method of controlling dust on a construction site?
The best place to start is to control the dust at the source with the assistance of water suppression and vacuum-equipped tools. Most sites use several of these.

Do you need to control dust?
Yes for most areas. Typical exposure limits are silica and environmental dust rules. Please note that requirements vary depending on country and type of project; always verify local requirements.

Which is the most economical dust control solution?
Water suppression is typically the least expensive method but is most effective when followed by source-capture equipment and proper housekeeping.

Should the dust control be part of a construction estimate?
Yes. Anything that is an equipment or materials cost, or a man-hour, has a separate line item, thereby boosting your margin and transparency of your bid.

Which of the following kinds of dust is the most hazardous on construction sites?
One of the most serious hazards is the release of respirable crystalline silica from cutting or grinding concrete, brick, stone, or tile.

Final Thoughts

The four habits for controlling dust are to prevent it from being generated in the first place, stop dust from getting out, clean up the dust in the right way, and protect your people. When they get this right they have safer sites, happier neighbors, fewer delays, and contractors that do. Contractors who also factor it into their bids safeguard their profits.

Creating a bid and looking for all of the costs to be paid? Check out www.designestimation.com to find out how our estimation services can help you with your next project.