MOLDetect Mold Test Kit
禁伦短文合集posted by David at 6:56 AM 12 comments
禁伦短文合集
禁伦短文合集posted by David at 6:56 AM 12 comments
Looking at all the beautiful full-color glossy photos of log home in magazines gives us an idealized vision of the perfect wooden house. Like a supermodel, we can't imagine wrinkles and imperfections, but like any natural product, log walls are full of traits that are an integral part of their character.
CHECKING: The new visitor to any log home is invariably struck by the cracks in the logs, sometimes stretching for several feet. Initially they might look alarming, but these cracks, or checks, are a natural process that occurs over the first few years when logs are still drying and reaching equilibrium with the environment. In no way do they weaken the integrity of your log wall.
When trees are cut down, there is naturally still some moisture left in the cells, especially when the tree is cut down live. These logs are called "green" and will settle many inches if used right away to build a house. Some manufacturers let their logs dry naturally – air dried – while others put the logs in a kiln and bake them for 30-45 days, which removes 80-85% of the moisture. However, they can't go any farther without doing damage to the wood, so the logs dry naturally for the next few years, and this process can create checks in the wood to relieve the pressure. However, the heartwood closest to the center of the tree is so hard that the checks will not go beyond the center of the log. As a result, you will not see the checks go all the way through.
SETTLING: As you may already suspect, there is a relationship between moisture content and settling of your log walls. No, settling does not have to be a "dirty word". As long as your builder knows how to deal with the settling and make provisions for the windows, doors, plumbing, and interior walls, your house can settle many inches and still age comfortably. Any log home will come with about a 2" gap above all the doors and windows, which will need to be filled with insulation. The builder will cut a vertical groove in the frame and affix nails to the windows and doors that will slide down the groove as the building settles, so nothing gets crushed. Most kiln-dried homes will only settle a couple of inches overall, and much of that will occur during the construction phase.
KNOTS: Depending on the species of wood used in your log home, some logs have more knots than others, just as some trees have more limbs than others. The more interesting the knot, the more likely your builder will place it at eye level, since each knot is truly unique. However, don't be surprised if the knots ooze sap on the sunny exterior walls of your house. Even the sealant won't stop the sap from working its way out. This will not happen on the inside of the house, or on the shady side. It only happens when the sun is beating down on the logs and heating them up in the summer time.
HAND-PEELED or MILLED: (or anything in between). Hand-crafted log homes are just that: the logs are cut and peeled by hand with a draw-knife, which creates a uneven surface along the log. For an even more rustic look, some of the bark is left intact. If the log is milled, the machine takes off the layer of bark, leaving a fairly smooth surface to the log. This can be sanded to a fine finish, if you have enough time or money. Sometimes, the manufacturer might take that milled log and run a draw-knife across it to make it look peeled. The type of finish is totally up to the buyer.
CHINKING vs. CAULKING: Chinking is historically done to a hand-crafted log home in order to keep the wind from howling in between the logs. It looks like a broad white band between log courses. When cut by hand, logs can be scribed so that an upper log is shaped to match the contours of the log beneath it. However, not all logs are scribed; some just rest atop the log below, creating large gaps in the uneven surface. Either way, handcrafted log homes tend to be chinked, which was historically a mix of clay, sand, lime, mud, thatch, you name it, but is now an acrylic compound which expands and contracts with the wood. Some homes still require chinking, and others use chinking for aesthetic purposes.
Many milled log homes are actually caulked with an acrylic product designed for log homes. This comes out of a caulking gun, and creates a neat, finished look as well as protecting the seams from infiltration. We tend to caulk milled homes or do nothing at all between log courses, because the joinery system is so tight that this step is not mandatory.
Every log home is unique, and each has its own personality. It's amazing how many different construction systems are available to create homes out of logs, and every style has its own characteristics. But overall, no matter what your log home looks like, the cozy warmth of logs cannot be duplicated in any other kind of house.
Mercedes Hayes is a Hiawatha Log Home dealer and also a Realtor in New Jersey and Pennsylvania. She designed her own log home which was featured in the 2004 Floor Plan Guide of Log Home Living magazine. You can learn more about log homes by visiting http://www.jerseyloghomes.com/
Article Source: http://EzineArticles.com/
Most of us work in environments with some type of Heating, Ventilation and Air-Conditioning system (HVAC). HVACs are designed to maintain comfortable temperature and humidity levels and filter out any harmful air pollutants. Ventilation is defined as the supply and removal of air from inside a building. This process typically includes bringing in outdoor air, conditioning and mixing it with some of the indoor air and exhausting some of the indoor air outside. The quality of indoor air may deteriorate when this process is not working properly.
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HVAC systems that are improperly operated or maintained can also contribute to Sick Building Syndrome (SBS). Some of the symptoms of SBS include dry mucous membranes and eye, nose, and throat irritation. These disorders lead to increased employee sick days and reduced work efficiency. The National Institute for Occupational Safety and Health reports that poor ventilation is an important contributing factor in many sick building cases.
ASHRAE Standards 62-1989 & 62-2001
In 1989, the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) published its "Standard 62-1989: Ventilation for Acceptable Indoor Air Quality". This standard applies to all types of facilities and recommends a range of 15 to 60 cfm/person, depending upon the activity in that room. Because of recent IAQ litigation, many HVAC system designers view ASHRAE Standard 62-89, as a minimum ventilation standard that must be met, in addition to local codes. In 2001 ASHRAE reviewed Standard 62-1989, approved and transferred to Standard 62-2001.
Ventilation System Problems and Solutions
The processes involved in ventilation provide for the filtering of pollutants. Increasing the rate at which outdoor air is supplied into the building increases indoor air quality. Buildings with high ventilation rates may suffer indoor air problems due to an uneven distribution of air, or inadequate exhaust ventilation. Well-ventilated buildings may also have a strong pollutant source, which will impair the indoor air quality. The closer such a source is to an exhaust the more effective the ventilation. It is good practice to provide separate exhaust systems in areas where copy machines or solvents are used. Providing exhaust for these specific sources can result in a reduction of the overall building exhaust ventilation needed.
System Design
Designs that specify HVAC system operation at reduced or interrupted flow during certain parts of the day can cause increased indoor contaminant levels and impair removal. Minimum ventilation rates should be defined by air cleanliness and distribution, as well as temperature and humidity.
Failure to maintain proper temperature, humidity and air movement in a building can lead occupants to block supply registers. Placement of partitions or other barriers within a space can also impair air movement. Also, locating air supply and return registers too close together can result in an uneven fresh air distribution.
The location of all air supply vents must be carefully considered. Place supply vents as far away as possible from outdoor sources of pollution, such as loading docks, parking and heavy traffic areas, chimneys, and trash depots, provide a pathway for contaminants into the building's ventilation system.
Proportion of Outdoor Air
To dilute and eventually remove indoor contaminants, HVAC systems must bring in adequate amounts of outdoor air. However, because it is costly to heat cold winter air and to cool hot summer air, some building engineers reduce or eliminate the amount of outdoor air brought into the system during hot and cold spells; this allows contaminated air to accumulate inside, causing pollutant concentrations to increase.
Periods of Operation
An HVAC system that begins to operate after building occupants have arrived or shuts off before the end of the day can cause an increase in building-and occupant-generated pollutant levels. Also if the system is off at night and on weekends, building-generated pollutants can accumulate.
Maintenance
HVAC systems must be properly maintained to promote indoor air quality. If this is not done, ventilation systems can become a source of contamination or become clogged and reduce or eliminate air-flow. Humidification and dehumidification systems must be kept clean to prevent the growth of harmful bacteria and fungi. Failure to properly treat the water in cooling towers to prevent growth of organisms, such as Legionnella, may introduce such organisms into the HVAC supply ducts and cause serious health problems. Accumulations of water anywhere in the system may foster harmful biological growth that can be distributed throughout the building.
Economic Considerations of Air Quality
It is generally agreed that poor indoor air can adversely affect employee health and productivity. Improvements in the indoor air environment may substantially increase employee moral and productivity. Therefore, it is important to include indoor air quality controls in operation, maintenance, and energy conservation strategies.
Resolving Air Quality Problems
Operate the ventilation system in a manner consistent with its design.
Perform maintenance and inspections on a regular basis.
Identify pollution sources and either remove them or use alternate venting techniques.
Increase ventilation rates during periods of increased pollution for example: during painting, renovation, and pesticides use.
Stay up to date on revisions to Ventilation Standards and Building Codes
Dream big and realize that you can achieve the feel of a new home without having to move. One of the great ironies of homeownership is that most houses reach their highest potential just when they are sold. The owners get by for years without improving or repairing their home. Does your house fall into this category? If so, get busy and start improving your greatest asset.
Remove Your Blinders
Stop looking at your house for what it is and begin to discover what it can be. The first step is to remove your blinders.
Whenever you live in one place for a while you develop a shorthand way of looking at it. Now, take a few minutes and really examine how you feel about your home. Inevitably, a number of characteristics will come to mind: some good, some bad.
You might think your house is cute, but cramped, or dark, but cozy. Some set of characteristics dominates the way you feel about the home. When you see a new idea or product for the home, your subconscious asks, Will it look good in my dark, but cozy house??
It's as if you take the basic characterization as being unchangeable, when in reality, just about anything can be changed. Plus, it will almost always be less expensive to upgrade your home than it will be to move into an already upgraded home. So if you like the neighborhood-don't move-just take whatever steps are necessary to improve your home.
Visualize Your Dream Home
At one extreme, you could tear down the house and start over again. Since that is drastic, just think about what you would do if you had a fresh start. Here are some thought-provoking questions:
What would you build if you could start over?
What would your dream house look like?
What would the master bedroom look like?
How about the kitchen?
How many cars would you like the garage to accommodate?
What if you changed your paint color scheme?
Let yourself go. Consider installing a large, two-person tub with jets that will help you unwind at the end of the day. If an area of your home is notoriously dark, install windows or glass blocks to provide natural light. Outside, how about a large deck for entertaining? Would it be nice to snuggle in your own private home theater? How would skylights change the feeling you get when you walk into the kitchen?
If your family seems to be outgrowing your house, add on a new room. Changing the appearance of the front entrance can drastically improve the look of your house. Also, landscaping with the help of a professional can do wonders for an overgrown, under maintained lawn. Replacing wallpaper, flooring, cabinets, fixtures, and appliances can update your home and make you feel like you're living in a brand new house.
Gather Ideas
Build your dream house in your mind. It's a great exercise for getting the blinders off. Once you begin to envision what you really want, you can start letting go of the old image of the house. With that done, you're ready for step two: gathering specific ideas.
The trick is to focus on desires. Don't spend too much time thinking about what you can afford or what is practical. Essentially, you are brainstorming. Even unworkable ideas are good because they often lead to still better, more feasible ones.
Go on a quest to discover your options. Go to home shows. Buy some magazines. Tour some model homes in nearby developments. Virtual equivalents for many of these activities now exist on the Internet. When you see something you like, take a picture, copy a photo, make some notes or tear out the page.
Gather together all the good ideas you find into a folder. Take it out from time to time and let the images stimulate your mind. You'll soon start combining ideas and coming up with completely new ones.
Once you begin to find that new ideas are getting rare, take your file to an architect or a design/build firm. They can help you figure out what's feasible. In many cases, they'll help you discover alternative ways of getting the results you desire the most.
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When you're trying to nail down a budget for your brand new house, "what's 1 percent in the grand scheme of things?" asks Newark, Ohio, custom home builder Vince Ghiloni. The dollar amount is not much, but, as Ghiloni tells his clients, the purpose is significant. He calls this 1 percent "insurance for the future."
Getting more specific, Ghiloni says he typically allocates about 1 percent of a construction budget for "beefing up the basics." He builds a stronger foundation, a stronger and more rigid frame, and he uses more insulation than the local building code requires so that "my houses will look as good inside and out in 15 years as they do the day my clients move in and they'll use less energy."
Expressing similar sentiments, Boston custom home builder Tom Silva, who is best known as the contractor for the This Old House television show says, "When the structure is stronger, elements that make it pretty will last longer." Unbeknownst to most homeowners, he explains, the building code is primarily a safety standard, not a quality one. The focus of the code is the safety of the people building and living in the house, not how well the materials will weather and look over time.
But, Silva elaborates, " If you over-structure and go a little beyond the building code, your house will be stiffer and withstand more punishment from rain and wind and snow as well as the normal wear and tear that occurs in any house that's lived in with kids running around and jumping up and down. When a house is stiffer, it's also more pleasant. When the kids jump overhead, the ceiling fixtures won't swing and the dishes won't rattle in the cabinets."
The four places that Silva encourages his clients to "heavy up" are the structural frame, insulation, windows and the heating and air conditioning system. "Spend a little extra here," he says, and it "will put money in your pocket."
Owners are frequently tempted to cut back on these essentials to make the project come in on budget and still get the oak floor and granite countertops. But Silva says, "You shouldn't cut back. You will save money forever in reduced utility bills and vastly reduced maintenance costs." You can add the granite and oak floor in five years, but in the meantime you're "living in a happier and more comfortable house with windows that always work." In fact, in his experience, five years later, many owners do not find the oak flooring and granite counters so compelling, and they decide to put the money somewhere else.
One place where Silva would "heavy up the structure" but one that most clients take for granted is "what the house sits on—the foundation," which he characterizes as "a snowshoe for your house." The cost for extra reinforcing to the foundation footer and wall is inconsequential, he says.
Most builders say that clients usually resist putting money into things they can't see, but Silva says in his experience people are amenable "when you explain not only what to do but also why to do it." It also helps when the person doing the explaining, as in Silva's case, enjoys iconic status as the most trusted home builder in America.
Beefing up a foundation is a good idea no matter where you live, Silva says, but enhancing other basics depends on where you live.
When you have a fairly benign climate, the case in Charlottesville, Va., for example, you won't benefit from thicker stud walls with more insulation. But, says Charlottesville custom home builder Randy Rinehart, the type of insulation you use will make a big difference in the degree of comfort inside the house. He uses a blown-in cellulose insulation made from recycled newspapers because it reduces air infiltration, which can make rooms drafty in winter. The insulation makes the temperature more even throughout the house, and it deadens sounds from outside.
Rinehart says that clients rarely squawk about the cellulose insulation, which might add $300 to the cost of a 2,500 square foot house. But there can be a lot of soul searching about the windows. When a house comes in over budget, windows are a tempting target because you can substitute cheaper ones and lower your cost without having to alter your design. But, over time window quality will have an impact on the ambience of a space and your enjoyment of it, Rinehart says. Everybody wants big windows that flood a space with natural light. But a cheap builder-grade window is generally less effective in stopping heat loss so you can feel drafts in the winter. In a few years they tend to leak, and the vacuum seals between the two panes of glass often break down so that the panes frost up in cold weather and you can't see out of them as well.
Windows won't frost up during California's mild winters, but the weather there must still be taken into account when choosing them. The salt air, wind and sun can ravage the exterior of houses built near the coast says Frank Fanto of Mendocino. "Some clients want to save money on the exterior to get more sizzle inside, but what you save up front will cost you in maintenance down the road."
Fanto always recommends clad wood windows (the exterior side of the window is vinyl or aluminum that is finished with a highly weather resistant paint). When clients want casement-type windows, he specs corrosive-resistant hinges and hardware. For the exposed wood siding that is standard in his area, he uses copper or stainless steel nails because the cheaper galvanized type used in most parts of the country will rust and leave stains running down the side of your house.
Though the climate of California is more benign than the rest of the country, the natural disasters—earthquakes, mudslides and brushfires—are more severe. As a consequence, the building codes are more stringent than those in others parts of the country, and "beefing up the basics" is not necessary, Fanto says.
But there are other extras that can enhance your enjoyment of your house. Along with making the exterior of the house weather resistant, San Luis Obispo, Calif., custom home builder Turko Semmes adds extra sound proofing to reduce noise within the house. He routinely installs resilient metal channels to dampen sound transmission in walls between bedrooms, bedrooms and bathrooms, and in the ceiling between bedrooms and noisier rooms below, as for example a bedroom over a kitchen-family room area. For a 2,500-square-foot, two-storied house he says the extra cost for the resilient channels would be about $300 to $500. If you're considering French doors for the entry to a master suite or a home office, Semmes likes to add a second layer of glass for sound proofing, which adds about $100 to the cost of each door.
Though many clients have a hard time getting enthusiastic about extras that they won't see, all the builders say they have a harder time with what they can see and are wildly enthusiastic about. The number of decisions that must be made can overwhelm even the most decisive business executive as the number of choices in everything has exploded, observes custom home builder Alan Washak of Columbia, Md. Ten years ago nearly everybody got oak floors. Now oak, maple and cherry floors are standard, and there are plenty of exotic tropical hardwoods to choose from if you want something really different. Once you pick the wood, you still have to decide on a finish and a stain. The oak flooring supplier offers ten stains, and the stair rail supplier offers thirty, Washak said.
Even harder than choosing everything is imaging what it will look like in the finished house. "You can have a very detailed set of plans and a computer simulation, but it's not real life. Most people won't get it until they're standing in it," Washak says. For the kitchen, where most people spend a lot, he and several other builders said they create cardboard mockups to give homeowners a feel for what the counter layout will look and feel like.
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