Urine and feces odor in crawlspaces can be caused by any number of animals including cats, rats, mice and even skunks. This is a common problem our service division treats.
We use high-pressure spray equipment similar to an airless paint spraying machine. The long hose gives much greater freedom to move around in the crawlspace while the high pressure produces a very small droplet that has better coverage and penetration. We use 515 spray tips on our spray machines.
An alternative would be to use a pump-up type garden sprayer. Unfortunately, these types of sprayers are difficult to use in shallow crawlspaces.
Application rates are as follows:
1. If the crawlspace is covered with a plastic vapor barrier, 200 SF per gallon of SCOE 10X ready-to-use is the usual application rate.
2. For a dirt floor crawlspace, 100 SF per gallon of SCOE 10X ready-to-use is the usual application rate.
Rule of thumb for SCOE 10X application rate: for every part of urine deposited over time, an equal part SCOE 10X will need to be applied to that location.
For personal safety, always wear a paper mask and goggles or a full-face respirator when high-pressure spraying SCOE 10X.