Urine contamination cleanup

What this involves

One accident on a hard floor is a cleaning job. Urine contamination becomes a remediation job when it has happened repeatedly or soaked in over time. Urine runs into carpet pad, spreads under the backing, and wicks into plywood or OSB subfloor, tack strip and the bottom of drywall. As it dries, it leaves salts and compounds that release ammonia odor again every time the humidity rises. That is why a unit can smell fine on a dry day and strong after rain, and why repeated carpet shampooing often makes things worse by rewetting the same salts. In multifamily buildings, urine can also travel through the subfloor to the ceiling of the unit below, which is why the inspection sometimes extends past the unit where the problem started.

Why professional remediation matters

The main concerns with urine are odor, material damage and ammonia, which can irritate eyes and airways at high levels in closed rooms. Urine from people with infections, or from rodents, can carry additional risks. Finding the full extent takes moisture meters and, often, ultraviolet inspection, because the stain visible on the surface is usually smaller than the contamination underneath. Getting rid of the odor for good normally means removing pad and sometimes subfloor and drywall edges, treating what remains, and sealing it before new flooring goes down. Doing the work in the right order matters: removing materials first, treating and drying the structure, then sealing. Sealing over damp or untreated subfloor tends to trap the odor rather than stop it, and the problem shows up again under new carpet a few months later.

What to avoid before help arrives

• Do not steam clean or shampoo urine-soaked carpet repeatedly. Heat and water can set stains and drive salts deeper.
• Do not paint over stained drywall or subfloor without treating it first; odor will come back through the paint.
• Do not mix bleach with ammonia-based cleaners. The combination releases toxic gas.
• Do not install new flooring over old subfloor that still smells.

How the work is done

1. Mapping. We use moisture readings and UV inspection to map where urine has traveled under flooring and up walls.
2. Removal. Saturated carpet, pad, tack strip and drywall edges are removed and bagged.
3. Subfloor treatment. Exposed subfloor is cleaned and treated. Sections too damaged to recover are flagged for replacement.
4. Sealing. Treated subfloor and framing can be sealed with an odor-blocking primer once dry, ready for new flooring.
5. Odor check. We check for remaining odor at the original source points before hand-back.

Waste handling

Urine-contaminated building materials are usually disposed of as ordinary construction or household waste, bagged to control odor. If blood is also present, those materials are handled as medical waste.

Afterward

Most urine jobs end with bare, sealed subfloor ready for new flooring. Landlords should compare the scope against the deposit and lease terms before re-letting, and keep the before-and-after documentation. In care settings where incontinence is ongoing, waterproof mattress covers, wipeable flooring and a regular cleaning routine reduce how often this level of work is needed.

Rules that apply in Tennessee

• OSHA Respiratory Protection Standard 29 CFR 1910.134 · checked 2026-11-03

Where we provide this service

Throughout our Middle Tennessee service area, including:

• Nashville
• Murfreesboro
• Clarksville
• Franklin

Related

• Animal waste and pet hoarding cleanup
• Human feces cleanup
• Mattress and furniture biohazard removal

Questions