The final step, not a shortcut
Encapsulation means applying a sealing coating, such as a specialty primer, sealant or encapsulant, over cleaned surfaces. After biohazard, smoke, urine or drug residue remediation, some staining or faint odor can remain in wood framing, subfloor, concrete or other materials even after thorough cleaning. Sealing locks it in so it doesn't affect new finishes or bleed through paint.
Encapsulation is never a substitute for removing contamination. Sealing over fluids, residue or saturated materials traps the problem rather than solving it, and odor or staining often returns. Some state drug lab rules also specify when and how encapsulation may be used.
When sealing is used
- Subfloor and framing after decomposition, urine or blood cleanup, where staining remains in wood
- Concrete slabs after fluid or urine cleanup
- Smoke-damaged surfaces after cleaning, so nicotine and soot residue don't bleed through new paint
- Drug residue remediation, where state rules allow encapsulation after cleaning to meet standards
- Attic sheathing and framing after animal waste cleanup
How it's done
- Confirm the surface is clean, by inspection and testing where applicable.
- Dry surfaces to the right moisture level for the product.
- Select the product for the surface and purpose, such as shellac-based or other stain- and odor-blocking primers, or encapsulants made for the application.
- Apply evenly, with full coverage of affected areas and a margin, following manufacturer directions.
- Document areas sealed and products used.
Ventilation
Some sealers release strong fumes while curing. Areas are ventilated and occupants kept away until products have cured as directed.
Common questions
Can you just seal instead of removing the flooring?
No. Sealing works only on surfaces that have been cleaned. Contaminated materials must be removed first.
Is the sealer safe after it dries?
Products are chosen and applied according to manufacturer directions. Once cured, they are covered by new finishes.
Will sealing stop odor permanently?
When the source has been removed, sealing residual staining is very effective at preventing lingering odor.