Structural Drying >> Roof Leak Detection

Moldy surfaces should be cleaned first and then disinfected; some products do both in a single step. In all cases, mold spores should be removed as completely as possible since killing them does not eliminate their toxicity or allergenic properties.Application of Cleaners are most efficiently applied using a combination of foam cleaning processes Roof Leak Detection and brush cleaning, followed by pressure washing.

Foam cleaning: Foam cleaning processes have many advantages over spraying Roof Leak Detection or wiping because foaming allows the product to stay on the surface (dwell) long enough for the chemicals to kill the mold or bacteria. Foam cleaning also reduces the amount of liquid used, making drying easier. Pump-up, air operated, and motorized foam generators are commercially available (Figure 2). 

Brushes improve decontamination of wooden studs and other surfaces by scrubbing the foam into affected surfaces. The combination of foam and Roof Leak Detection scrubbing also helps to remove waterborne contaminants other than mold that get absorbed into wooden materials. The foam should sit on the surface for 3 to 5 minutes before scrubbing (refer to the label of the EPA-registered product for minimum dwell time).

Water-damaged porous materials should be removed. Non-flooded gypsum board Roof Leak Detection and plaster walls that remain after gutting that are dirty or harboring mold growth can be cleaned using the foam solution. Care should be taken to inspect both the front and back side of the non-flooded gypsum board and plaster walls for remaining dirt and mold to ensure all affected areas are cleaned. 

These semi-porous surfaces should not be scrubbed, but should instead be wiped off with disposable towels.Pressure washing: Residual foam on wall studs, floor joists, and other surfaces can be rinsed off with clear water. The fastest Roof Leak Detection and most efficient rinse method that minimizes the amount of water used is a residential-type pressure washer set at low pressure so that the spray is a light mist (Figure 3). 

Squeegees can be used to control or direct remaining liquid. High-Efficiency Particulate Air (HEPA) vacuums designed for wet use can be used to collect the residue. Drawbacks of BleachWhile bleach is convenient as a cleaner and stain remover for hard, non-porous items, Roof Leak Detection it has distinct drawbacks when cleaning floodimpacted buildings. Many types of bleach are not EPA-registered as a disinfectant. 

Further, its effectiveness in killing bacteria and mold is significantly reduced when it comes in contact with residual dirt, which is often present in flooded homes. Also, Roof Leak Detection if bleach water comes into contact with electrical components and other metal parts of mechanical systems it can cause corrosion. Bleach water can also compromise the effectiveness of termite treatments in the soil surrounding the building. 

Pump-up or Roof Leak Detection motorized foam generators can apply a wide range of cleaning chemicals. sing a pressure washer to rinse surfaces cleaned with a foam solution. Cleaning in Weather Extremes Although cold weather poses challenges for restoring flooded buildings, it also has some advantages. In particular, cooler weather slows down the spread of mold. 

However, buildings need to be warmed to 50° to 75°F to provide for worker comfort, improve the effectiveness of cleaning and sanitizing agents, and allow commercial drying equipment to operate efficiently.Hot and humid weather conditions also pose challenges. Mold and bacteria spread more quickly under such conditions, Roof Leak Detection and natural drying of building materials slows significantly. 

In such circumstances, Roof Leak Detection the use of drying equipment or air conditioning is critical to lower the moisture content of structural materials prior to any rebuilding activities.Cleaning Crawlspaces must be accessed to complete the decontamination of a home. Removing the flooring is the simplest way to enter these areas. 

Once access is obtained, solid contamination should be removed from under the building, Roof Leak Detection along with any remaining water. Application of cleaning foam followed by agitation should be conducted on all exposed sides of floor joists, foundation walls, and remaining structural elements. 

After cleaning and eliminating standing water any exposed ground in the crawlspace not already covered with intact plastic sheeting (vapor retarder) should be covered with plastic sheeting Roof Leak Detection and held in place with landscape fabric pins to minimize potential mold growth and future moisture migration into the house.

Failure to allow adequate drying prior to reconstruction can trap moisture in the building, Roof Leak Detection which can cause structural damage and potential health problems.Proper Drying Prior to Rebuilding After the cleaning process has been completed, the building and any salvageable contents need to dry. 

The decision to allow the building and contents to dry naturally or to accelerate the drying by using equipment (Figure 4) often depends on whether power is available, Roof Leak Detection whether the home’s heating and ventilation systems have been restored, and the moisture content of the affected materials. 

Once the electrical and HVAC systems have been restored Roof Leak Detection and sanitized, the moisture content of wetted salvageable building materials should be checked to determine whether drying equipment will be necessary (see Figure 5 and Table 1). Drying equipment includes fans, dehumidifiers, air conditioners, and auxiliary electric heaters. 

Moisture content should be checked using an intrusive/penetrating (pin-type) moisture meter (Figure 5) because moisture content is difficult to assess accurately using only touch Roof Leak Detection or sight. The materials must be rechecked after drying before doing any rebuilding. Wetted materials are presumed to be dry when their moisture content is less than or equal to 15 percent (Table 1). 

Natural drying can be sped up by opening windows and doors. If structural materials are allowed to dry naturally, Roof Leak Detection the moisture content must be checked before doing any rebuilding. Natural drying can take a long time, especially in cold weather. Verifying that materials are sufficiently dry before rebuilding is the key to minimizing future problems such as fungal growth.

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