Blood in Carpet and Subfloor Cleanup

How fluids move through a carpeted floor

A typical carpeted floor has three layers. Each one behaves differently when a liquid lands on it.

That's why the stain you can see is a poor guide to the area underneath. The pad can be wet over a larger footprint, and the subfloor may show staining in a different shape again. Time matters too. The longer fluid sits, the further it tends to travel and the deeper it goes.

Why shampooing or extracting doesn't solve it

Carpet cleaners and extractors are built to lift ordinary soil from the surface of the pile. Used on blood or bodily fluids, they often push liquid further into the pad and spread it across a wider area. The carpet may look clean once it dries, but the pad and subfloor still hold contaminated material, which is often why an odor comes back days later.

Biological material can carry bloodborne pathogens such as hepatitis B, hepatitis C and HIV, according to the CDC. Porous materials that have absorbed it can't be reliably disinfected, which is why removal, not cleaning, is the normal answer for carpet and pad. Our guide to the limits of household cleaning explains this in more depth.

Finding the edge of contamination

The most important part of a flooring job is deciding where to stop. Cut too little and contamination remains; cut too much and you pay to replace flooring that was fine.

During the assessment and the work itself, we:

• Pull back carpet beyond the visible stain and look at the underside of the backing.
• Lift and inspect the pad, working outward until we reach clean, dry material.
• Look at the subfloor surface for staining, and check seams and fastener holes where fluid tends to collect.
• Check tack strip and baseboard edges, which are easy to miss and sometimes need removal too.

We then cut carpet and pad back to a clean margin, so the replacement piece has a sound edge to seam to. Our guide on how professionals assess rooms and materials covers this process across other surfaces.

What happens to the subfloor

Once the carpet and pad are out, the subfloor falls into one of three situations.

1. Surface staining only

   If fluid didn't penetrate far, the wood can be cleaned and disinfected using EPA-registered products according to label directions. It's then left to dry.

2. Penetrated but structurally sound

   Where staining is deeper but the panel is solid, cleaning and disinfection are followed by an encapsulating sealer, which locks in residual staining and odor so new flooring can go over it.

3. Saturated or soft

   If a section is saturated, delaminating or soft, we cut it out. A contractor then replaces it before new flooring goes in.

We tell you which applies, and why, before any subfloor is cut. If fluid has gone below the subfloor, for example into joists or toward the ceiling of a room below, we'll explain what we found and what it means for the job.

Other floor types we see in homes

Hardwood and engineered wood

Sealed hardwood can sometimes be cleaned, but fluid often gets between boards. Boards that have absorbed material may need removing; a flooring contractor can then patch or refinish.

Laminate and vinyl plank

These have a hard surface, but liquid seeps through the joints into the underlayment and onto the subfloor. Planks in the affected area usually come up so the layer beneath can be checked.

Tile

Glazed tile cleans well. Grout is porous, so heavily affected grout lines may need to be removed and redone by a contractor.

Concrete slab

Common in basements and many newer homes. Concrete is porous too, but once surface coverings are removed it can usually be cleaned, disinfected and sealed.

Before we arrive

Leave the flooring as it is. Please don't shampoo, steam clean or pull up the carpet, and keep foot traffic off the area so material isn't tracked into other rooms. Closing the door and keeping pets out is enough. If you have home or landlord insurance, call them before throwing anything away.

If carpet has already been cleaned or partly removed, that's fine. Tell us when you call so we know to look further out.

After removal: replacement, cost and related pages

Our job ends with clean, disinfected and, where needed, sealed subfloor. Installing new pad, carpet or plank is a flooring contractor's work. Our photos and scope show exactly what came out, which makes it easier to get an accurate replacement quote.

The scope, and so the price, depends on the floor area affected, how many layers are involved, whether subfloor is sealed or cut out, furniture to be moved, and disposal volume. See how pricing works. Some homeowner's or landlord policies may cover some of this work, depending on the policy.

If a soiled mattress, rug or sofa was sitting on the same floor, the contaminated furniture page explains how those are assessed. For blood on other surfaces, see blood cleanup or dried blood cleanup. Everything else for homes is on the residential biohazard cleanup hub. We travel to homes from Nashville across our service area, including Hendersonville and Lebanon.

Questions people ask