Updated April 2013
Case study #2
Pet urine odor in Flooring
Click on the pictures for a larger version of the picture.
• One cat and one
dog with a territorial problem.
• The carpet
was removed and the walls were painted in
preparation for carpet installation.
• After 2
treatments with OdorXit, the urine odor in the room was noticeable but
overwhelming until the base boards were removed.
This picture shows the back of the base board that
was removed from the wall to its left. Notice the yellow staining
at the end (b) and both edges (A & C) of the strip. This is hormonal
spray and it is also under the new paint on the wall
above and behind where the base board was on the wall.
The piece of base board on the other side of the wall at
(C) is also stained in the same manor. To get rid of the odor that
was painted over, 12 inches of drywall was removed and replaced
and the interior of the wall was sprayed with OdorXit because
it was stained due to capillary action.
The first course of glued down Prague flooring
(C to D) has been removed to expose the extent of contamination beneath.
Flooring section E and F show the difference between heavily (E) contaminate
flooring and slightly contaminated (F) flooring. The same is
displayed in section C and D.
Tack strip G provides a clear example of a tack
strip that needs to be replaced.
Area H is an example of flooring lightly contaminated with urine, but
the area under and behind the base board is a much bigger problem with
on the right side of the wall is the area
displayed above. This area of plywood is in need of replacement because
of the level of staining and its refusal to dry. Further, with a stain
like this, the urine has seeped under the wall and is hiding between
the plywood subflooring and the 2 by 4 plate at the bottom of the wall.
Infecting OdorXit Concentrate between the plate and subfloor usually
eliminates the odor without resorting to removal.
This link shows the interior of the wall and tools needed to
inject Concentrate into the under wall area.
Note the 2
black marks (B), they are nails that have rusted extensively.
The stained flooring along the wall is soft and will eventually
rot. Plywood, unlike hardwood flooring, is made of soft wood and is
vulnerable to this type of damage. Sealing the area with an alcohol or oil type product will not help this
This is an example of what happens at the edge
of a piece of plywood sub-flooring when the contamination is primarily on
one side of a joint. The board on the right is nearly untouched while
the one on the left is severely damaged. This is recoverable because
the wood is not spongy and the edge is easily accessed by OdorXit solution
to eliminate the odor.
Fire place hearths are a favorite place for cats. The large stain
in the corner between the brick and wall does not appear to be all that
contaminated, but rest assured, when a fire is started in the fire box, the
odor will abound.
When the tack strip and padding were removed they were
In this case, the floor and the hearth were both involved and needed
This picture is of the doorway between the kitchen and the dining room. The kitchen flooring installer was still working on the job as this picture was taken.
This is an area that should have been treated before the new
floor covering was installed. The stains could have been water from the kitchen
but sniffing the stain revealed that they were not!
Small areas of untreated urine contamination like
this will eventually provide the new owner with those little wisps of odor on humid days or after cooking a big meal or when a
small amount of mop water enters the area. If they have a pet, it
will find this area in a heart beat and re-mark it with its own scent.
Later, the owner removed a 3 x 2 section of the new floor covering and the adhesive, then treating the
urine stain. The floor covering was replaced with new.
It almost matched.
Removing the adhesive is very important and difficult. The residue of the adhesive probably prevented some of the urine residue from being neutralized completely.
The Rest of the Story
Rehabbing a house with pet urine contamination
can be done quickly and easily even if small portions of wood need
to be replaced. Plywood sub-flooring is easy to treat and
easy to spot problem areas, but the areas must be odor free
before continuing with painting and new flooring coverings.
Hormonal spray on walls and trim strips
as in picture 1 and 2 are often near significant urine spots though they are not
at all limited to being in the same area. These areas
must be addressed BEFORE painting so that the contaminant on the
wall can be effectively treated.
This study is meant to demonstrates
that urine contamination on sub-flooring is easy to identify
and treat. I might add, the source of this
type of staining is by no means limited to pets.
Please do not take
this case study or its conclusion as an indictment of cats or pets
in general. IT IS NOT MEANT TO BE ONE!
I have a dog and 2 cats pictured on
this site, and would not trade any of them.
They also do not soil my house.