11.1 Exterior Ground Sheeting, Vertical Containment, and Weather Limits
Key Takeaways
- Containment under 40 CFR 745.223 is a process to protect workers and the environment by controlling exposures to lead-contaminated dust and debris created during abatement — outdoors that means catching chips before they hit soil, sidewalks, and neighbors, not only wearing PPE.
- HUD Guidelines Chapter 8 methodology: typically at least 6-mil impermeable polyethylene on the ground, attached at the foundation with no gaps, weighted, curbed at the edges, and extended far enough to collect falling debris (at least 10 feet on the ground floor when feasible; about 20 feet when work is above the ground floor).
- Close or seal windows, doors, and other openings of the building being abated and of adjacent buildings in the work zone. Use vertical shrouds or sheeting on scaffolding when wind, a sidewalk, a street, a neighboring property, or height would carry chips off the ground plastic.
- 40 CFR 745.227 does not publish a numeric EPA wind-speed limit. HUD Chapter 8 methodology is to stop exterior work when wind exceeds 20 miles per hour or whenever dust and debris cannot be contained, and to finish cleanup before rain or snow.
- Restricted practices still apply outdoors: no open-flame burning or torching; machine sanding, grinding, or abrasive blasting only with HEPA exhaust; dry scraping limited to 20 square feet on exterior surfaces; heat guns below 1100°F. If the exterior must be blasted, HUD Chapter 12 requires a tent over the entire building, negative pressure of at least 10 air changes per hour, and HEPA-filtered exhaust.
Catch the chips before they become a soil job
Quick Answer: Containment (40 CFR 745.223) is a process to protect workers and the environment by controlling exposures to the lead-contaminated dust and debris created during an abatement. Outdoors that process is ground sheeting, a foundation seal, vertical shrouds when wind or neighbors would carry chips off the plastic, closed windows on this building and adjacent buildings, and stop-work when weather would defeat the sheeting. HUD Guidelines Chapter 8 is the documented methodology under 745.227(a)(3) for how to build that system. 745.227 itself does not publish a numeric EPA wind-speed limit. Restricted practices in 745.227(e)(6) still apply on the facade. If abrasive blasting of the exterior must be done, HUD Guidelines Chapter 12 requires a tent over the entire building, negative pressure of at least 10 air changes per hour (ACH), and HEPA-filtered exhaust.
Interior containment (Chapter 10) is a sealed room with critical barriers and, when needed, negative air. Exterior containment is a catchment. Gravity and wind are the transport. Paint chips that miss the plastic become bare-soil contamination, sidewalk debris, and a neighbor's trough full of your job. 745.223's definition is not worker PPE plus a cone in the driveway. If chips leave the work area, containment failed even if every worker wore a respirator.
This section is how to sheet the ground, seal the foundation, add vertical containment, and stop for weather. Daily chip pickup, dripline visual clearance, play sets, and multi-family walkways are Section 11.2. Soil removal and permanent covering are Chapter 15. Restricted-practice details beyond the outdoor reminder are Chapter 13. Waste characterization is Chapter 17. Post-abatement visual language is 745.227(e)(8)(v)(C) and Chapter 18.
Ground sheeting is a catchment, not a drop cloth you drag behind the ladder
HUD Guidelines Chapter 8, Worksite Preparation for Exterior Paint-Disturbing Work, is the field method accredited courses teach. EPA's abatement rule does not write a 10-foot sentence into 745.227. Use HUD's distances as documented methodology, and use the physical test the exam also respects: the sheeting must be large enough and well enough sealed that falling chips land on it, not on play-area soil or the public walk.
| Element | Documented methodology (HUD Chapter 8) | Exam trap |
|---|---|---|
| Material | Disposable impermeable polyethylene, typically at least 6-mil to resist tears. Not landscape fabric, geotextile, or cloth. | Breathable weed barrier so the grass lives is not containment. |
| Extent | Far enough from working surfaces to collect all falling paint chips and debris. Ground-floor work: at least 10 feet in all directions when feasible, or a sufficient distance to collect falling debris, whichever is greater. Work above the ground floor: as a general guide, about 20 feet. | A 3-foot strip at the dripline under third-story scraping. |
| Obstacles | If an adjacent building or property line is closer than 10 or 20 feet, protect as much as feasible; sheet the facing wall and ground of a same-owner building; coordinate with a neighbor to sheet their ground. | Skipping the neighbor because 745.227 does not name their address. |
| Attachment | Tape and/or staple to wood siding or ribbon board so there are no gaps between sheeting and the building. Masonry may need a wood strip. | Draping plastic against brick with gaps at the foundation so chips slide into the soil. |
| Weight and curb | Weight with two-by-fours or similar objects. Build a curb at the edge to stop contaminated runoff and keep debris from blowing off. | Unweighted plastic that kites on the first gust. |
| Ladders | Do not set ladder feet on top of plastic. Cut slots, set feet on the ground, and tape the slots when the ladder moves — or set the ladder on a large sturdy plywood sheet that protects the poly. | Puncturing a path of holes you never tape, then calling the soil under the holes contained. |
| Vegetation | In hot weather, plastic can burn vegetation. White plastic is less harmful than black or clear. | Black poly baked onto the owner's shrubs as an unplanned soil cover. |
Worked example — one-story wet-scrape. South elevation, ground-floor clapboards, wet-scrape and component replacement of window casings. The supervisor hangs 6-mil poly from a taped wood strip at the water table, extends it 10 feet into the yard (farther where the porch roof will shed chips), weights the field with 2x4s, and curbs the sidewalk edge so a surprise shower does not carry chips to the gutter. Ladder slots are cut and retaped. That is containment. A painter's canvas the helper drags along the wall is not.
Worked example — third-story scraping, 8-foot side yard. Chips from height travel. HUD's 20-foot guide cannot fit between this house and the neighbor. The supervisor sheets the entire side yard, runs poly up the neighbor's facing foundation after written permission, adds vertical shrouds on the scaffold (below), and treats the uncovered strip of public sidewalk as a surface that must be cleaned continuously — not as a legal dumping zone because the tape measure ran out.
Vertical containment, scaffolding, and closed openings
Ground plastic loses if wind carries chips over the curb. HUD Chapter 8: vertical shrouding on scaffolding generally should be used if work is close to a sidewalk, street, or another property, or if work will be conducted at a height of more than three stories. Scaffolding with vertical shrouds, or staging on pump jacks, is how you stop a third-story flake from becoming a stroller-height chip on the public walk.
Vertical containment is sheeting or shrouds that make a wall around the work face so debris falls onto the ground poly. It is not caution tape. It is not hoping the forecast stays calm. When the facade is tight to a sidewalk, skip the argument that 745.227 never uses the word shroud. The environment 745.223 told you to protect includes that sidewalk.
Windows, doors, and other openings within the work zone stay tightly closed or sealed, including openings in adjacent buildings. HUD Chapter 8 uses a 20-foot guide from working surfaces. Remaining residents are instructed not to open those windows. If an entrance closer than 20 feet must be used, HUD methodology is a shroud above and beside the door, a simple airlock flap, and a tack pad so shoes do not track chips inside. If residents remain or return at day's end, at least one lead-safe entryway must exist. Do not work front and rear porches at the same time unless there is a third entry.
Negative-pressure interior rooms and three-stage decontamination units are Chapter 10. They do not replace outdoor vertical shrouds. An AFU in the living room will not catch a chip that left the scaffold for the neighbor's sandbox.
Weather: HUD's 20 mph, EPA's silence, and rain
Do not invent an EPA wind number. 40 CFR 745.227 does not say 15 mph, 20 mph, or 25 mph. Accredited courses and HUD Guidelines Chapter 8 do give a field rule, and that is the documented methodology you use to implement 745.223 containment:
- Do not conduct exterior work if wind speeds are greater than 20 miles per hour or if dust and debris cannot be adequately contained.
- If chips and debris are blowing off the protective sheeting, work must stop until the wind dies down or adequate containment (more poly, higher shrouds, a smaller face) is installed.
- Cleanup must occur before rain, snow, or other precipitation begins. Rain is not a cleaning method. Rain is a transport method to the storm drain and the play area.
The operational test the exam will also accept, even if a question never says 20 mph: stop exterior wet-scraping and removal when wind would carry debris off the sheeting. Keep working because we are already wet is how you donate chips to the next census tract.
Power washing, if it is even lawful on the job, is not ordinary ground sheeting. HUD Chapter 8: extra care to contain runoff; a certified abatement supervisor experienced with those methods should design special containment and water-collection. Do not invent a federal permission to hydroblast lead-based paint into the yard. Uncontained water blasting is a prohibited-method problem (Chapter 13), not a weather footnote.
Restricted practices still apply on the facade
Outdoor air does not waive 745.227(e)(6):
| Practice | Exterior rule |
|---|---|
| Open-flame burning or torching | Prohibited. A torch on the eaves is still a torch. |
| Machine sanding, grinding, abrasive blasting, or sandblasting | Prohibited unless used with HEPA exhaust control that removes particles of 0.3 microns or larger at 99.97 percent or greater efficiency. |
| Dry scraping | Permitted only with heat guns, around electrical outlets, or when treating defective spots totaling no more than 20 square feet on exterior surfaces (the interior companion is 2 square feet per room, hallway, or stairwell). |
| Heat guns | Below 1100°F only. |
The 20 square feet dry-scrape allowance is a limited-spot exception, not a license to dry-scrape a whole elevation. Wet methods, chemical removal, and heat guns under 1100°F are Chapter 13. The containment point is: even a legal wet-scrape still needs the sheeting in this section, and an illegal blast is not cured by excellent plastic.
Blasting tent — HUD Chapter 12 exception, not a loophole. Traditional uncontained abrasive blasting is prohibited in residential work. If, for some reason, the exterior must be blasted, HUD Guidelines Chapter 12 is blunt: the entire building must be covered with a tent and placed under negative pressure with at least 10 air changes per hour. All exhaust air must pass through a HEPA filter. Fresh air is supplied at a lower rate than exhaust so the tent stays negative. Ground sheeting alone is not a blast tent. A visqueen lean-to on one wall is not a tent over the entire building. Exam items that offer blasting if the neighbors close their windows are offering a soil-lead factory.
Do not use the facade job to create a soil-lead hazard
If bare play-area soil is at or above 400 ppm, or the rest of the yard is at or above 1,200 ppm, that is a soil-lead hazard (745.227(h)(4)). How to abate soil is Chapter 15. This chapter's duty is narrower and immediate: exterior paint work must not add chips to bare play-area soil. Sheeting that stops at the swing-set post so chips land in the sand is not containment. It is a new exposure pathway you created.
Removed soil, when soil abatement happens, shall not be used as topsoil at another residential property or child-occupied facility (745.227(e)(7)). Do not sweep today's chips into a pile, call them dirt, and donate them to the daycare down the block.
Worked example — wind at 2 p.m. The crew is wet-scraping the west wall. Gusts lift flakes over the 2x4 curb onto the unsheltered walk. The supervisor stops removal, does not wait for 5 p.m., picks chips off the walk, raises a vertical shroud, extends the poly, and restarts only when debris stays on the sheeting. HUD's 20 mph line is the planning number; chips leaving the plastic is the stop-work number you do not need an anemometer to see.
Worked example — blasting bid. An owner wants the clapboards blasted because it is faster. The firm either (1) selects a non-blast method that 745.227(e)(6) allows, or (2) designs a full-building tent, ≥10 ACH negative pressure, HEPA exhaust, and HEPA-exhaust blasting tools. Option (3) — blast into a 10-foot ground sheet with the windows shut — is not a method. It is a 745.227(e)(6) and HUD Chapter 12 failure.
Official sources: 40 CFR 745.223 (containment); 40 CFR 745.227(a)(3), (e)(2), (e)(6), (e)(7), (h)(4); HUD Guidelines Chapter 8 (exterior worksite preparation) and Chapter 12 (abrasive blasting tent, ≥10 ACH, HEPA exhaust).
A certified supervisor is preparing the ground under exterior paint abatement on a one-story dwelling. Which ground-containment method matches HUD Guidelines Chapter 8 as a documented methodology under 40 CFR 745.227(a)(3)?
Wind picks up during exterior wet-scraping and paint chips begin leaving the ground sheeting. What is the correct stop-work rule?
If abrasive blasting of exterior lead-based paint must be performed, what containment does HUD Guidelines Chapter 12 require, in addition to the HEPA-exhaust restriction in 40 CFR 745.227(e)(6)?
Exterior scraping will occur from scaffolding on a three-story facade next to a sidewalk and a neighbor's windows. Which combination is the documented methodology?