Crawl Space Drying >> How To Clean Up A Flooded Crawl Space

The treatment needed for these fungi is to trace the fungus back to its source of moisture, usually the ground, and cut off the connection. Often it comes up through a brace, frame, wooden concrete form, or grade stake that serves as a bridge to let the fungus grow from moist soil to a joist or sill.  How To Clean Up A Flooded Crawl Space Sometimes a joist is in direct contact with a tree stump that has been left under the house. 

In other cases, the source from which the fungus is bringing its moisture may not be so easily located. How To Clean Up A Flooded Crawl Space These special fungi sometimes get their moisture from the soil, without direct wood contact, through strands of mycelium that grow a foot or two over the surface of foundation walls, or through cracks in loosely built masonry. 

Use sound dry wood to replace any that has been made useless by decay. if the sources of the moisture that enabled the decay to get started are entirely eliminated, replace only the wood that has been weakened. How To Clean Up A Flooded Crawl Space When there is any doubt as to the moisture proofing, however, especially if the original infection has spread rapidly.

It is safest to remove also the apparently sound wood 2 feet in each direction from the part appreciably decayed, and to make replacements with wood that has been thoroughly impregnated with a preservative (page 8).  How To Clean Up A Flooded Crawl Space  Before putting the new wood in place, give all adjacent old wood and masonry surfaces a heavy brush treatment with a preservative. 

Pesticides used improperly can be injurious to humans, animals, and plants. 
Follow the directions and heed all precautions on the labels. How To Clean Up A Flooded Crawl Space Store pesticides in original containers under lock and key-out of the reach of children and animals-and away from food and feed. 

Avoid prolonged inhalation of pesticide vapors; wear protective clothing and equipment if specified on the container. How To Clean Up A Flooded Crawl Space In case a pesticide is swallowed or gets in the eyes, follow the first-aid treatment given on the label, and get prompt medical attention. If a pesticide is spilled on your skin or clothing, remove clothing immediately and wash skin thoroughly. 

NOTE: Registrations of pesticides are under constant review by the U.S. Environmental Protection Agency. Use only pesticides that bear a Federal registration number and carry directions for home and garden use. How To Clean Up A Flooded Crawl Space Carbon dioxide (CO2) is a colorless, odorless, non-flammable gas that is a product of cellular respiration and burning of fossil fuels. 

It has a molecular weight of 44.01g/mol (NIOSH 1976). Although it is typically present as a gas, carbon dioxide also can be a solid form as dry ice and liquefied, depending on temperature and pressure (Nelson 2000). How To Clean Up A Flooded Crawl Space This gas is utilized by many types of industry including breweries, mining ore, and manufacturing of carbonated drinks, drugs, disinfectants, pottery, and baking powder (NIOSH 1976). 

It also is a primary gas associated with volcanic eruptions (Farrar et al. 1999; IVHHN 2005). CO2 acts to displace oxygen, making compressed CO2 the main ingredient in fire extinguishers (MDPH 2005). How To Clean Up A Flooded Crawl Space Occupations that are most at risk from CO2 exposure include miners, brewers, carbonated beverage workers, and grain elevator workers (CCOHS 2005; Nelson 2000). 

CO2 is present in the atmosphere at 0.035% (Aerias 2005; CCOHS 2005). In terms of worker safety, Occupational Safety and Health Administration (OSHA) has set a permissible exposure limit (PEL) for CO2 of 5,000 parts per million (ppm) over an 8-hour work day, How To Clean Up A Flooded Crawl Space which is equivalent to 0.5% by volume of air. 

Similarly, the American Conference of Governmental Industrial Hygienists (ACGIH) TLV (threshold limit value) is 5,000 ppm for an 8-hour workday, How To Clean Up A Flooded Crawl Space with a ceiling exposure limit of 30,000 ppm for a 10-minute period based on acute inhalation data (MDPH 2005; NIOSH 1976). 

A value of 40,000 ppm is considered immediately dangerous to life and How To Clean Up A Flooded Crawl Space health based on the fact that a 30-minute exposure to 50,000 ppm produces intoxication, and concentrations greater than that (7-10%) produce unconsciousness (NIOSH 1996; Tox. Review 2005). 

Additionally, acute toxicity data show the lethal concentration low (LCLo) for CO2 is 90,000 ppm (9%) over 5 minutes (NIOSH 1996). How To Clean Up A Flooded Crawl Space See Table 1 for a listing of regulatory agency standards for acceptable CO2 concentrations in the workplace. CO2 is a good indicator of proper building ventilation and indoor air exchange rates. 

Consequently, it is measured in buildings to determine if the indoor air is adequate for humans to occupy the building (MDPH 2005). Table 1 Agency Standards for CO2 in the Workplace. How To Clean Up A Flooded Crawl Space Agency Low end CO2 Concentration (ppm)1 High-end CO2 Concentration Applies to CO2 concentration in the workplace considered safe for a 40-hour week. 

Based on a 10-minute period for NIOSH and a 15-minute period for OSHA and ACGIH. PEL = Permissible Exposure Limit TLV = Threshold Limit Value REL= Recommended Exposure Limit TWA= Time Weighted Average STEL= Short Term Exposure Limit. How To Clean Up A Flooded Crawl Space Although normal levels of CO2 are considered harmless, under the right conditions, CO2 can cause adverse health effects. 

High concentrations of CO2 in confined areas can be potentially dangerous. CO2 may act as an oxygen displacer in confined spaces and cause a number of reactions. How To Clean Up A Flooded Crawl Space These reactions include, but are not limited to, dizziness, disorientation, suffocation, and under certain circumstances, death. 

Death occurs when there is a depression of the central nervous system (CNS) with prolonged exposure to high levels of CO2 and the body’s compensatory mechanisms are overwhelmed or fail (Farrar et al. 1999;  How To Clean Up A Flooded Crawl Space  IVHHN 2005; Nelson 2000; NIOSH 1976; NIOSH 1996). 

Toxicology of CO2 CO2 is considered to be a potential inhalation toxicant and a simple asphyxiate (Aerias 2005; NIOSH 1976; Priestly 2003). How To Clean Up A Flooded Crawl Space It enters the body from the atmosphere through the lungs, is distributed to the blood, and may cause an acid-base imbalance, or acidosis, with subsequent CNS depression (Nelson 2000; Priestly 2003). 

Acidosis is caused by an overabundance of CO2 in the blood. Under normal physiological circumstances, there is a higher concentration of CO2 in the blood than in the lungs, How To Clean Up A Flooded Crawl Space forming a concentration gradient, where blood CO2 diffuses into the lungs and then is exhaled. 

An increase in inhaled CO2 and subsequent reaction with water in the blood forms carbonic acid (H2 CO3), which then dissociates into hydrogen ions [H+ ] and bicarbonate [HCO3 - ]. The excess CO2 shifts the equilibrium toward the creation of more hydrogen ions, How To Clean Up A Flooded Crawl Space thus creating an acidic environment (see equation below). During respiratory acidosis, the pH of the blood becomes less than half.

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