How to Scrape and Feather Sand Peeling Trim on a Pre-1978 House
Why this matters
Scraping peeling window trim is the most ordinary prep job on an old house and the one most likely to put lead chips in a yard where a child plays. A dry scraper and a drop cloth that stops at the foundation leave chips in the grass and dust on the neighbor's porch, and in pre-1978 target housing done for pay that is also a federal violation. The lead-safe version is not much slower once the crew has done it a few times. It is a different sequence: contain first, keep everything wet, catch every chip, clean daily, and prove the ground is clean before the plastic comes up. This card owns that sequence for exterior trim; the rule itself is summarized in 'Lead Paint RRP Protocol Reference'.
The governing idea: the method is the control
Lead paint is harmless while it stays on the wall as an intact film. It becomes the hazard the moment a tool turns it into chips and dust, and the finer the particle, the further it travels and the easier it is to swallow or breathe. Every step below exists to keep the particle large, wet and on the plastic:
- Wet keeps dust from going airborne.
- Hand tools and HEPA-shrouded power tools make chips instead of fine dust, or capture the fine dust at the tool.
- Plastic to 10 feet catches the chips that fall.
- Daily cleanup keeps a day's chips from being tracked, blown or rained off the plastic overnight.
- Visual verification proves the ground under the work is clean before the work is called done.
Skip any one and the others cannot make it up. A HEPA sander over a drop cloth that stops 3 feet out still puts every scraped chip that bounces into the lawn.
Before you start
Is it RRP work? Any home built before 1978 is presumed to carry lead paint until an EPA-recognized test kit used by a certified renovator, or a certified renovator's paint chip sample sent to a recognized lab, says otherwise. Where the presumption holds and the job is paid work on target housing, the EPA RRP rule at 40 CFR 745 Subpart E applies: the firm must be certified, a certified renovator is assigned to the job, and the owner gets the Renovate Right pamphlet before work begins. A state that runs its own EPA-authorized program applies its own rule, which can be stricter. The minor-repair exemption covers exterior jobs disturbing 20 square feet or less of painted surface, and it does not apply where a prohibited practice is used, or to window replacement or demolition of painted surfaces. Measure before assuming you are under it.
Protect the crew. Lead dust is swallowed and breathed. OSHA's construction lead standard, 29 CFR 1926.62, treats manual scraping and manual sanding of lead paint as tasks presumed to expose workers above the permissible exposure limit until the employer's exposure assessment shows otherwise, in substance; check the current text. Until then the crew gets interim protection: respirators within a 1910.134 (applied to construction by 29 CFR 1926.103) respirator program (a half-face with P100 filters is the usual choice for that tier), disposable coveralls, a wash station, and no eating, drinking or smoking inside the work area. A worker not in the respirator program does not scrape. Work clothes and shoes do not go home in the truck cab.
Ladders and lines. Ladder setup and power line clearance belong to 'Ladder and Scaffold Setup for Painters'. A wet scraper on a ladder near the service drop is still a ladder near the service drop.
Weather. Rain on open plastic carries chips off the edges, and wind lifts chips and dust off the plastic. If debris is leaving the covering, work stops until it does not.
Build the containment
10 ft work area 10 ft
|<------>|<---------------->|<------>|
+--------+--------+------------------+--------+
| HOUSE wall window trim being wall |
| scraped, ladders |
+--------+--------+------------------+--------+
| | 10 ft
| ground plastic, edges weighted | out
| chips land here, misted, | from
| picked up at end of each day | wall
+------------------------------------+
doors and windows within 20 ft: CLOSED
warning signs at the plastic edge
property line closer than 10 ft: plastic to
the line; extra precautions such as
vertical containment
- Cover the ground at least 10 feet out from the work in every direction, including 10 feet past each end of the work area along the wall, or to the property line if that is closer. Heavy plastic, taped to the foundation so chips cannot slip under the edge, edges weighted. The 10 feet is a minimum; on a two-story wall, chips from the second floor carry further and the covering goes further.
- Close every door and window within 20 feet of the work, on this house and on any neighboring building inside that distance. Dust drawn in through an open window becomes an interior cleanup the rule now requires.
- Post warning signs at the edge of the plastic, and keep the customer, children and pets out of the area for the duration.
- Vertical containment near the line. Where the work area abuts a property line, another building is close by, or wind dictates it, the rule calls for extra precautions in containing the work area, vertical containment being the usual one, so dust and debris do not migrate to the neighboring property, in substance; check 745.85. That usually means plastic sheeting on a frame standing up from the ground covering. Near a walkway or a neighbor's building it is often worth doing anyway.
The sequence on the trim
- Mist before every scrape. A pump sprayer or spray bottle of water, wetting just the area about to be scraped. Do not soak the wood, which raises the grain and delays priming; damp enough that no dust comes off the blade.
- Scrape with a hand scraper, pulling, not chopping. A carbide pull scraper lifts loose paint in chips. Stop when the remaining paint is tightly bonded: if the scraper skates over an edge, that edge stays. You are removing what has failed, not stripping the trim.
- Feather sand the edges wet. The step between the scraped bare area and the remaining paint telegraphs through the new coat. Work it down with a damp sanding sponge until a fingertip drawn across the transition feels no ledge, typically starting around 80 to 100 grit and finishing finer. On long runs, a sander with a HEPA vacuum attached at the shroud is allowed; a sander without HEPA exhaust control is a prohibited practice, and a shop vacuum with an ordinary pleated filter is not HEPA exhaust control.
- Never burn it, never overheat it. Open-flame burning or torching is prohibited outright. A heat gun at or above 1100 degrees F is prohibited, and even below that temperature heat releases lead fume, so most crews reserve heat for a stubborn spot and wet scraping for everything else.
- Keep chips on the plastic. Chips that stick to the wall or the siding below are misted and wiped down onto the covering. The crew does not walk off the plastic with chips on their boots: wipe or remove shoe covers at the edge.
- Let the bare wood dry and spot prime per 'The Exterior Primer Map, Substrate by Substrate'. Bare wood left a week or two in sun begins to degrade at the surface, and primer over that gray layer loses grip.
Daily cleanup and the end of the job
End of each day: mist the plastic, pick up the visible chips by hand or with a HEPA vacuum, and bag them in heavy plastic sealed at the work area. Plastic that stays down overnight is secured against wind and rain. Equipment that touched lead is wiped or HEPA vacuumed before it leaves the area.
When the scraping is finished: the certified renovator performs the post-renovation check. On an exterior job that is a visual inspection, not the cloth-and-card verification used inside: look for dust, debris and residue on the plastic, the wall, the sills and the ground at the plastic edges. Anything visible gets cleaned and the area looked at again. Only then is the plastic misted, folded dirty side in, sealed and bagged, and the ground under where it lay looked at once more. 'RRP Containment and Cleaning Verification' owns the full verification steps and the records.
Waste. Bagged chips and plastic go out in sealed bags. Residential renovation debris is often allowed into ordinary household waste, but states differ; follow your state's rule.
Records. The rule requires the firm to keep documentation of compliance, including the pamphlet acknowledgment and the certified renovator's checklist, for three years.
Worked example: six windows on a 1952 ranch
The job. A single-story ranch built in 1952. Six windows on the south wall have peeling casings and sills; the customer wants them scraped, primed and painted. The south wall runs 46 feet; the windows occupy the middle 30 feet.
Is it over 20 square feet? Each window has about 16 feet of casing at about 4-1/2 inches wide, which is 16 times 0.375, or 6 square feet, plus a sill about 3 feet by 6 inches, another 1.5 square feet. That is 7.5 square feet per window, and six windows is 45 square feet. Well over 20, so no minor-repair exemption even before asking about methods.
The test. The certified renovator used an EPA-recognized test kit on two casings. Both read positive. The plan changed from a half-day dry scrape to a contained job, and the customer received the pamphlet and signed the acknowledgment before work started.
The containment. Plastic ran 10 feet past each end of the 30-foot window run and 10 feet out from the wall: 50 feet by 10 feet, 500 square feet of covering as planned, a little less where the fence cut it short. At the east end the neighbor's fence stood 7 feet from the wall, so the plastic stopped at the fence and the crew stood plastic up on a frame along it, because chips falling there would otherwise land in the neighbor's yard. Two windows on the neighbor's house faced the work within 20 feet; the crew asked the neighbor to keep them closed and got it.
The work. Two days. Wet scraping took most of day one, feather sanding and the daily cleanup the rest. Spot primer went on the bare wood on day two once it was dry. Each evening the crew misted and picked the plastic, bagged the chips, and weighted the edges.
The check that failed first. At the visual inspection, the renovator found paint flakes caught in the mulch bed just past the plastic edge below the west window, where the wind had lifted a corner of the covering on day one. The crew HEPA vacuumed the mulch surface and picked the flakes, and the renovator looked again before calling it clean. The edge had been weighted but not taped to the foundation at that corner, which is how the flakes got under it.
What would change the answer.
- A 1985 house. No presumption, no RRP; ordinary prep and an ordinary drop cloth, with the scraped debris still cleaned up.
- One window only. Seven and a half square feet is under the exterior minor-repair threshold, so the RRP containment and verification requirements would not apply, as long as no prohibited practice is used. The crew's OSHA obligations under 1926.62 still apply, and many shops run the lead-safe sequence anyway, because the chips from one window land in the same yard.
- A state-authorized program. Some states set their own rules for this work, and they can be stricter than the federal one.
How to know it is right
- No visible chips or dust on the plastic, the wall, the sills or the ground at the plastic edges at the visual inspection, and none under the plastic after it is lifted.
- Feathered edges a fingertip cannot catch, so the repair does not show as a map of patches under the topcoat.
- No prohibited practice used: every sander had HEPA exhaust at the shroud, and no flame or high heat touched the trim.
- Paperwork complete: pamphlet acknowledgment, test result, renovator's checklist.
References
- 40 CFR 745 Subpart E, EPA Renovation, Repair and Painting rule (work practices at 745.85, recordkeeping at 745.86)
- OSHA 29 CFR 1926.62, Lead in construction; 29 CFR 1910.134, Respiratory protection
- See related: Lead Paint RRP Protocol Reference
- See related: RRP Containment and Cleaning Verification
- See related: The 1950s Porch Repaint That Became RRP Work