Structural Drying >> Hurricane Ceiling Leak Fix

Note that this requirement is not very satisfactory. At the end of a water absorption experiment, i.e., when the moisture front has reached the sample top, a moisture content profile is still present over the sample. Leaving the sample in water contact for a longer period of time slightly increases the overall moisture absorbed, Hurricane Ceiling Leak Fix but does not equilibrate this moisture profile entirely. 

A perfectly uniform moisture distribution will, hence, hardly be established. However, the discussion shows that possibly a high and practically reachable moisture content should be used as initial condition for the drying experiment. Sample Height (5) The sample height is already part of the equation. It is, Hurricane Ceiling Leak Fix though, recommended to use sample heights according to the laboratory practice. 

This means 1 to 10 cm (ca 0.4 to 4 in.), depending on the material, Hurricane Ceiling Leak Fix should typically be used. The height of the sample determines the duration of the overall drying and the information content to be gained from the data. A material like concrete with a very low liquid conductivity has a short first and a very long second drying phase. 

For a drying experiment on concrete, a small sample height is suitable. A material like ceramic brick, Hurricane Ceiling Leak Fix on the other hand, has a high capillary conductivity. Here, drying experiments would provide more meaningful results when higher sample heights are used. Discussion of the Influences The initial moisture content and the sample height remained somehow unclear in their impact on the first drying phase duration. 

Therefore, some additional calculations were performed for aerated autoclaved concrete, Hurricane Ceiling Leak Fix where both sample height and initial moisture content were varied. The results are shown in Figure 5. The top charts in Figure 5 show results where the drying was started from a moisture content lower than capillary saturation. Two interesting effects can be seen in these charts. 

One is that the first drying phase duration does follow the sample height in square-root form. The other effect is that there appears to be a threshold sample height up Hurricane Ceiling Leak Fix to which a relationship exists between first drying phase duration and sample height. Samples higher than this threshold have all the same first drying phase duration. 

The lower charts of Figure 5 show Hurricane Ceiling Leak Fix results where the drying was started from capillary saturation. Sample heights up to 50 cm were chosen to illustrate that for this material and these conditions, the first drying phase duration shows a more-or-less square-root dependence to the sample height. The explanation for this can be found in the moisture transport processes occurring during the first drying phase. 

This drying phase is characterized by a linear drying Hurricane Ceiling Leak Fix throughout the whole material sample. A clear moisture profile does not yet form. The first drying phase ends when a distinct moisture profile establishes inside the material. The moisture content at which this happens is called critical moisture content. 

If the moisture content at the beginning of the drying is smaller than the critical moisture content, the first drying phase consists only of the formation of a moisture profile. This affects only the boundary range of the material. For samples higher than the affected range, Hurricane Ceiling Leak Fix this becomes independent of the sample height. We can observe this in top charts of Figure 5. 

If, at the other extreme, the drying starts at a moisture content very much higher than critical moisture content, Hurricane Ceiling Leak Fix the linear drying without establishing a moisture profile is the main process. Its length is characterized by the amount of water to be dried out linearly. This is directly proportional to the sample height, and we observe a linear relationship between first drying phase duration and sample height. 

This is the case for the brick shown in Figure 2 at the right. For cases in between these two extremes, Hurricane Ceiling Leak Fix the first drying phase is partly characterized by a linear drying and partly by the establishment of a distinct moisture profile. For such cases we do not see a linear behavior but a relationship that does, more or less, follow a square-root behavior over the sample height (Figure 5, bottom charts). 

To confirm this reasoning, Hurricane Ceiling Leak Fix the differential equation of moisture diffusion (Equation 2) was solved analytically for an infinite plate. (2) where is the moisture content and D is the moisture diffusivity. The results of the analytic solution are shown in Figure 6. They were obtained for constant boundary conditions and a constant moisture diffusivity. 

For the exact steps of this analysis, Hurricane Ceiling Leak Fix refer to Scheffler (2008). The left-side chart of Figure 6 presents the development of the boundary moisture content over time for different sample heights (each line corresponds with one sample height). It becomes apparent that there is an upper bound that is not exceeded. 

Once reached, the course of boundary moisture content is independent of the sample height. The rightside chart of Figure 6 confirms this. Here, the first drying phase duration is plotted versus sample height. For the chosen conditions of this analysis, Hurricane Ceiling Leak Fix the first drying phase duration becomes height independent at around 15 cm (5.9 in.). Two conclusions can be drawn from these analyses. 

First is that the first drying phase does not have a clear dependence on the sample height, which could be used for the definition of a drying coefficient. Second is the summary of influences Hurricane Ceiling Leak Fix and dependencies of the drying process, which is compiled in Table 1. INTRODUCTION OF A NEW DRYING COEFFICIENT We have shown that the first drying phase duration is not a suitable measure for a drying coefficient. 

The derivation of a drying coefficient still has to cope with the different dependencies of the drying process. Numerical simulation has proven to be a valuable tool of such investigations, Hurricane Ceiling Leak Fix as climatic influences can easily be controlled. 

Indeed, if boundary temperature and relative humidity are kept constant and, for simplicity, a one-dimensional problem is assumed, only the following parameters remain: material properties, initial moisture content, Hurricane Ceiling Leak Fix and drying height. These have to be combined in a single-number drying coefficient.

Asbestos Mitigation

Basically asbestos comes from a group of naturally occurring minerals, with fibers that are of a thin elongated mass which can be separated easily from its strands. These minerals have excellent insulating value, highly resistant to heat and chemicals with flexible fibers that can be woven ea  read more..

Replace Lead Painted Windows Grant

The National Institute of Environmental Health Sciences awarded an American Recovery and Reinvestment Act challenge grant to the NYU School of Medicine and National Center for Healthy Housing (NCHH) for "Preventing Child Residential Lead Exposure by Window Replacement." With 20,000 applicants,   read more..

How To Stop An Angry Tenant From Destroying Your P

The most common complaint received by the Montgomery County Office of Landlord-Tenant Affairs concerns deductions made by a landlord from a security deposit. This booklet provides landlords and tenants with guidelines and principles for fairly and accurately determining what constitutes ordinary wea  read more..

Dehumidify A Basement Without Electricity

The reheat energy is free and the penalties of increased refrigeration or the expense of additional cooling energy are avoided. The net effect of this cycle is identical to that of the run-around enhancements with two beneficial exceptions: Dehumidification Dehumidify A Basement Without Electricity (1) A precooling coil is not required and (2  read more..

Basement Drying

Recent radio and television hype about Mold Remediation Basement Drying many times creates an unusual and undue worry about contact to this mold. In the workplace many times the employees will a credit wide ranges of symptoms do to mold. These employees will accuse their made up illness even when there is no signs of ac  read more..

Lead Paint Removal Is Hazardous

When you are medically eligible to return to your former job, your employer must return you to your "former job status.” This means that you are entitled to the position, wages, benefits, etc., you would have if you had not been removed. If you would still be in your old job if no removal had occ  read more..

Get Rid Of Flood Damage Smells In Basements

If You Are Asked To Evacuate Take essential disaster supplies with you. See "Disaster Supplies Kit" on this web site.Community activities Your neighborhood or community can take steps to reduce flood losses in the future. Recent flooding may prompt local governments to start a flood planning effort   read more..

Wet Carpet From A Plumbing Leak

Common Indoor Moisture Sources Include: Flooding, inadequate maintenance and failure of building materials and systems Roof leaks Plumbing leaks Overflow from tubs, sinks or toilets Firewood stored indoors Humidifier use Inadequate venting of kitchen and Water Damage Wet Carpet From A Plumbing Leak bath humidity Improper venting  read more..

Types Of Security Fences

Although elevated, this house in North Carolina could not withstand the 15 ft (4.5 m) of storm surge that came with Hurricane Floyd (1999)Additionally, currents created by tides combine with the waves to severely erode beaches and coastal highways. Buildings that survive hurricane winds can be damag  read more..

Toxic Mold Symptoms

Cleanup Recommendations for Specific Situations Surface mold due to condensation – less than 10 square feet Examples - bathroom ceiling, exterior wall in a closet, exterior wall behind furniture, boxes, shelving Correct the problem that caused condensation. Wash the mold area with soapy wat  read more..