Dehumidification >> Wet Crawl Space Dehumidification Vs. Ventilation

While the kiln described in this publication is designed for simple operation, you will still need to closely monitor the drying process. Monitoring the moisture loss and quality of the wood during the drying process will help you maximize the efficiency of the kiln. Simply explained, when drying lumber you want to dry fast enough to prevent stain and long drying times, yet slow enough to prevent checks Wet Crawl Space Dehumidification Vs. Ventilation and other drying defects. 

The prevalence of certain defects is influenced by the species, thickness, moisture content, and drying conditions. Monitoring the moisture content during the drying process is important to avoid drying too rapidly (which results in quality loss) Wet Crawl Space Dehumidification Vs. Ventilation and to know when the load has reached the desired moisture content. 

Measure the sample boards daily to determine the daily rate of moisture loss. This loss should be compared with the safe drying rate for that species (see Figure 7 for hardwoods). If the drying rate is too fast, Wet Crawl Space Dehumidification Vs. Ventilation then it may be necessary to increase the relative humidity setpoint of the dehumidifier or turn two of the four fans off. 

Lumber should be dried to the maximum safe drying rate without exceeding the daily loss. The safe drying rate refers to the moisture loss in one day, Wet Crawl Space Dehumidification Vs. Ventilation not the average loss over several days. Figure 7 lists the safe drying rate for common one inch thick North American hardwoods. Softwoods are typically able to dry at a much faster rate and moisture content losses above 10 percent per day are quite common. 

When lumber is at its highest moisture content, Wet Crawl Space Dehumidification Vs. Ventilation it is important to adhere to the safe drying rate. Most unwanted checking and splitting in drying lumber occurs as the wood loses the first one-third of its moisture content. Once the lumber dries below 22 percent moisture content, the risk of creating new cracks and splits is low. 

Dry lumber for interior use to a moisture content of six to eight percent for most areas of the country. This will limit the amount of dimensional changes that would occur when the wood is processed Wet Crawl Space Dehumidification Vs. Ventilation and in service. Lumber used for exterior purposes is usually dried to 12 to 15 percent moisture content. Softwood lumber used for framing is commercially dried to 19 percent moisture content. 

However, fewer building defects would result if softwood framing lumber were 5 dried down to 12 percent moisture content. For information on drying schedules Wet Crawl Space Dehumidification Vs. Ventilation and schedules for specific species and thicknesses, see the reference to the Dry Kiln Operator’s Manual and the Dry Kiln Schedules for Commercial Woods: Temperate and Tropical. 

In measuring the rates of moisture loss, it is impractical to weigh every board in the kiln and electric meters are not accurate above 30 percent moisture content. Therefore, Wet Crawl Space Dehumidification Vs. Ventilation the sample board method should be used to determine the moisture content of lumber in the kiln. This method uses short, carefully chosen sample boards sawn from larger pieces of lumber and these sample boards are weighed periodically and estimated moistures are calculated. 

Since the wettest or slowest drying lumber in the kiln has the highest risk of splitting and cracking, the sample boards should represent this kind of lumber. Use samples from the most recently cut wood, the widest and thickest boards, Wet Crawl Space Dehumidification Vs. Ventilation lumber with the most heartwood, and boards that are quarter sawn whenever possible (see Appendix C: Procedures for Cutting and Using Sample Boards). 

Select a few boards from the stack of lumber that represent the slowest drying material. These would be the widest, thickest, Wet Crawl Space Dehumidification Vs. Ventilation and highest moisture content boards. Boards that contain the most heartwood or are quartersawn are also suitable. 2. Cut a 24 to 30 inch sample that is free of knots and at least 12 inches from the end of the board. 

Then cut two one inch sections from the sample board as shown (see Figure A). Make sure to number the sections Wet Crawl Space Dehumidification Vs. Ventilation and sample board. 3. Immediately weigh the one inch sections (accuracy of about one gram required) and record the weight. Measure immediately after cutting since it is important that they do not gain or lose weight before weighing. 

4. End coat the sample board with a roofing cement or commercial end coating (see Figure B). Now, Wet Crawl Space Dehumidification Vs. Ventilation weigh the sample board and record the weight on the sample (accuracy of 0.1 pounds). 5. Place the sample board in the lumber stack in a location where it will dry at the same rate as the rest of the lumber in the dryer (see Figure C). 

6. Place the one inch sections in an oven 215ºF to 218ºF (102ºC to 103ºC) and dry– usually 18 to 36 hours depending on the oven. Reweigh Wet Crawl Space Dehumidification Vs. Ventilation and obtain the oven dry weight. 7. Calculate the moisture content of each section and average the moisture content (MC) of two sections to obtain the moisture content of the sample board. 

8. Estimate the oven dry weight of the sample board using average moisture content and weight from step #4, and record this so it can be used for future moisture content calculations. 9. To determine the moisture content at any time, Wet Crawl Space Dehumidification Vs. Ventilation reweigh the sample board and calculate. Treatment and disposal of large amount of produced water is a considerable economic and environmental burden for oil and gas industry. 

On the other hand, for many remote areas with shorting of clean water supply and enriched with oil/gas production such as New Mexico, Wet Crawl Space Dehumidification Vs. Ventilation purified produced water could be a valuable water source for beneficial uses. The goal of this research is to purify produced water at wellhead, yielding water clean enough for beneficial uses like drilling, stimulating, or water flooding. 

A new concept of produced water purification by Humidification-dehumidification (HD) process was developed in which low-temperature energy sources, Wet Crawl Space Dehumidification Vs. Ventilation such as co-produced geothermal energy or solar energy, could be used to drive the water desalination process. 

The system contains humidifier where produced water meets with flowing air for evaporation and dehumidifier for clean water creation and collection. The unique feature of this process is that co-produced geothermal energy or Wet Crawl Space Dehumidification Vs. Ventilation inexpensive solar energy could be deployed. In addition, direct internal heat transfer has greatly enhanced latent heat recovery.

Pest Control

SOONER OR LATER, we're all pestered by pests. Whether it's ants in the kitchen or weeds in the vegetable garden, pests can be annoying and bothersome. At the same time, many of us are concerned that the pesticides we use to control pests can cause problems too. How can pests be controlled safely? Wh  read more..

Lead Can Hurt Your Child

Lead can hurt your child. Take these steps to keep your child safe from lead. Keep your home clean and dust free. Wet mop floors, wet wipe window sills, vacuum, and wash all surfaces often. Use household cleaner and rinse with clean water. This keeps lead in dust from spreading in the house. Do not   read more..

Smoke Damage From A House Fire

Damaged, or "mutilated" currency may be mailed or personally delivered to the Bureau of Engraving and Printing. When mutilated currency is submitted, a letter should be included stating the estimated value of the currency and an explanation of how the currency became mutilated. Each case is carefull  read more..

Safely Remove Lead Paint

What is lead and why is it harmful? Lead is a soft, bluish-gray metal that is highly toxic and all around us. It is an element that occurs naturally. It has a centuries-old history of many commercial and industrial uses. There is no known need for lead in human nutrition and Lead Paint Removal Safely Remove Lead Paint even rela  read more..

Tenant Move Out

Meth Lab Cleanup Tenant Move Out may have already affected your particular community, if not, it is more than likely on its way. But, at the same time as meth labs are hitting the communities throughout the United States, many communities are faced with budget cuts and dwindling financial resources. The law enforcement   read more..

House Fire Exposure To Smoke

"Mask" means different things to different people. For example, to some people "dust mask" describes a P100 particulate respirator used in the construction industry, Smoke Damage House Fire Exposure To Smoke and to others it means a one-strap paper mask that is NOT a respirator. A disposable particulate respirator has been ce  read more..

How Long Do Hurricanes Last

The most critical aspect of building in hurricane hazard areas is the method of connecting the structural members. Pilkey et al. (1981) note that wood is one of the best materials for absorbing short-duration loads such as those caused by wind, but the strength of wood cannot be used to advantage if  read more..

Compulsive Animal Hoarding

Compulsive hoarding isn't anything new, as matter of fact, hoarding has existed as long as there were people and there were things to be collected. But until recently, when these television shows started to bring this disease to light and let the world learn more about Hoarding Compulsive Animal Hoarding. Also there are sh  read more..

How To Get Rid Of Asbestos Material In California

This information will help you understand asbestos: what it is, its health effects, where it is in your home, and what to do about it. Even if asbestos is in your home, this is usually NOT a serious problem. The mere presence of asbestos in a home or a building is not hazardous. The danger is that a  read more..

How To Remove Tiles With Asbestos

Preparing the Work Area Disabling HVAC Systems: The power to the heating, ventilation, and air conditioning systems that service the Asbestos Abatement How To Remove Tiles With Asbestos restricted area must be deactivated and locked off. All ducts, grills, access ports, windows and vents must be sealed off with two layers of plastic to   read more..