Concept of Specific Area

Let us start with the definition of an aggregate’s specific area. Specific area is defined as the grains’ surface area related to a unit mass, usually given in terms of square centimeter per gram (cm2/g). Fillers are tested in Europe with Blaine’s method* according to EN 196-6 (see Chapter 8). The measured specific area depends on how much the parent material was reduced in size (broken up or crushed). The more the material was milled (crushed), the finer the filler, and the larger its specific area.

An example will serve to illustrate the influence of gradation on specific area size. Let us take two fillers and call them A and B. Let them both pass completely (100%) through a 0.063-mm sieve. Laser analyzer tests reveal significant differences in the material smaller than 0.063 mm. There are 20% and 90% of grains smaller than 0.005 mm in fillers A and B, respectively. This means the filler B has a higher content of very fine grains. What difference does this make? A higher content of finer grains means a substantial increase in their specific area. Because of these large differences in the gradation of the fillers that are less than 0.063 mm, the specific areas of fillers A and B may differ widely—even by two or three times—though, at first sight, a simple screening analysis through the 0.063-mm sieve may not suggest such a distinction.

If a filler makes up 10% of a typical SMA mix (100 kg per 1 metric ton), then the specific area of this ingredient alone amounts to 350 million cm2 or 3500 m2, which is equivalent to the area of a sports field that is 100 m long and 35 m wide. That is quite a lot, isn’t it?

In an SMA mixture, the grains’ surface area should be evenly covered with a binder film (a couple of microns thick or a bit more). Different specific areas of filler require different quantities of binder to coat them, which means a changeable demand for binder in a mortar. If the true sieve analysis of a filler passes unnoticed and only a simplified screening through the limit sieve is observed (as with fillers A and B), one should not wonder why the same SMA mixture behaves utterly differ­ently when fillers are changed. The specific area that needs to be coated with binder may be substantially different in one case versus another, and a correction of the added binder content may be necessary.

An increase in the specific area of filler requires an increase in the binder quan­tity just to preserve a suitable mortar consistency. However, an increase in the filler content with a constant binder content causes a reduction of the film-thickness coat­ing the filler grains, making the mix appear to be drier. A substantial increase in the filler-binder (F:B) index increases the risk of cracking. [12]

We can see that the concept of binder content in a mixture based on the specific area size is pretty vivid and appealing to the imagination. There are some analytic formulae approximating the required binder content related to the specific area of a mineral mix; one can find an example in The Asphalt Handbook (MS-4).

Before we leave the issue of filler gradation and specific area, it should be noted that much research has raised questions about a direct relationship existing between the gradation and the stiffening properties of a filler (e. g., Anderson, 1987). Also, the significance of the amount of material passing the 0.02-mm sieve and its specific area are questioned as they do not appear to influence mortar properties (Brown and Cooley, 1999). Thus it is time to proceed to another concept, that of voids in a dry – compacted filler.

Documenting What’s There

This section explains how to measure rooms and record the location and condition of the structure and mechanical systems (plumbing, electrical, heating/cooling) as well as how to explore build­ing elements that affect design. Here, too, you learn how to map the site and consider how well exterior renovations will suit the neighborhood.

MEASURING ROOMS

Start by drawing a basic plan of each floor.

image63Подпись:Подпись:Подпись: Need beggar water heater

Подпись: Room Rater
Подпись: Rating YOUR ROOMS As you work up your wish list (program requirements), systematically rate how well each room works. Is the bedroom away, or at least screened, from a noisy street? Is the nursery or small child's bedroom near a bathroom? Is the home office inside of or detached from the main house? Does each room receive sunlight at optimal times? Are the rooms big enough for your furniture? Especially note conflicts within or between rooms, because such conflicts often generate useful design changes. Your room rating sheet might look something like the one shown here.

Using a 25-ft. retractable tape measure, record the overall dimensions of each room, noting the position of existing doors, windows, closets, fireplaces—anything that affects space. Take the time to record this information accurately. Be consistent in your measurements, always meas­uring to window and door jambs, not just to casings. (You are really measuring finished openings in walls.) Also note header and sill heights as well as ceiling heights and plane changes. Determine interior and exterior wall thicknesses by measuring door jambs.

Подпись: Tracing paper is one of the cheapest "building materials" and one of the most essential. With scaled-down floor plans on graph paper, overlays of tracing paper let you to make quick, reasonably accurate sketches as you explore different design options. Tracing-paper rolls are much cheaper than pads. 1111 Подпись: I Creating Floor Plansimage64Подпись: Using a 25 ft. measuring tape, record the dimensions of each room. Graph paper makes the task easier.To create accurate floor plans, transfer your recorded measurements to graph paper. Graph paper is handy because it helps you draw square corners and maintain scale without needing fancy drafting equipment. As to scale, most people find that Va in. = 1 ft. is large enough for detail and thus doesn’t require graph paper larger than 8’A in. x 11 in.

MAPPING THE BUILDING SITE

Once you’ve created floor plans, use a 100-ft. tape to measure the overall exterior dimensions. Using graph paper with a smaller scale than you used for the interior drawings (say, f8 in. = 1 ft.), posi­tion the house as accurately as you can on the lot. If you don’t know exact lot dimensions, check the closing documents you obtained upon pur­chasing the house or consult public records.

Also sketch locations of major site features, such as fences, trees, driveways, walks, ponds, streams, gardens, dog runs, and outbuildings. In the margins of the sketch or on separate sheets, draw in or note structures and features on adja­cent properties that affect your property or its use—such as a tree you enjoy seeing or a garage you don’t. As you gather information, think about how your proposed renovation might affect your neighbors. If a house addition blocks a neighbor’s view, you might have trouble getting it approved. Likewise, there’s no point in adding a window if it would overlook something ugly.

Most communities have setback requirements, minimum distances from structures to property lines; and seeking variances from setbacks is

often a long, frustrating process. Finally, don’t assume that existing fences accurately represent property lines. Verify property lines early on.

Analysis*

Assessment of the reliability of a hydrosystems infrastructural system or its components involves the use of probability and statistics. This chapter reviews and summarizes some fundamental principles and theories essential to relia­bility analysis.

2.1 Terminology

In probability theory, an experiment represents the process of making obser­vations of random phenomena. The outcome of an observation from a random phenomenon cannot be predicted with absolute accuracy. The entirety of all possible outcomes of an experiment constitutes the sample space. An event is any subset of outcomes contained in the sample space, and hence an event could be an empty (or null) set, a subset of the sample space, or the sample space itself. Appropriate operators for events are union, intersection, and com­plement. The occurrence of events A and B is denoted as A U B (the union of A and B), whereas the joint occurrence of events A and B is denoted as A n B or simply (A, B) (the intersection of A and B). Throughout the book, the comple­ment of event A is denoted as A. When two events A and B contain no common elements, then the two events are mutually exclusive or disjoint events, which is expressed as (A, B) = 0, where 0 denotes the null set. Venn diagrams illustrat­ing the union and intersection of two events are shown in Fig. 2.1. When the oc­currence of event A depends on that of event B, then they are conditional events,

*Most of this chapter, except Secs. 2.5 and 2.7, is adopted from Tung and Yen (2005).

Copyright © 2006 by The McGraw-Hill Companies, Inc. Click here for terms of use.

Analysis*

which is denoted by A | B. Some useful set operation rules are

1. Commutative rule: AU B = B U A; AП B = B П A.

2. Associative rule: (AU B) U C = AU (B U C); (AП B) n C = An (B n C).

3. Distributive rule: An (B U C) = (An B) U (An C); AU (B n C) = (AU B) n (A U C).

4. de Morgan’s rule: (AU BУ = An B’; (AnBУ = A’UB’.

Probability is a numeric measure of the likelihood of the occurrence of an event. Therefore, probability is a real-valued number that can be manipulated by ordinary algebraic operators, such as +, -, x, and /. The probability of the occurrence of an event A can be assessed in two ways. In the case where an experiment can be repeated, the probability of having event A occurring can be estimated as the ratio of the number of replications in which event A occurs nA versus the total number of replications n, that is, nA/n. This ratio is called the relative frequency of occurrence of event A in the sequence of n replications. In principle, as the number of replications gets larger, the value of the relative frequency becomes more stable, and the true probability of event A occurring could be obtained as

P (A) = lim„^TO—A (2.1)

n

The probabilities so obtained are called objective or posterior probabilities be­cause they depend completely on observations of the occurrence of the event.

In some situations, the physical performance of an experiment is prohibited or impractical. The probability of the occurrence of an event can only be estimated subjectively on the basis of experience and judgment. Such probabilities are called subjective or prior probabilities.

Runoff

Runoff derives, principally, from rainfall falling on the pavement and surround­ing ground. Although surface water drainage falls outside the scope of this book, runoff becomes of interest as some soaks in through cracks or through pervious surfacings. The proportion soaking-in will vary depending on the rainfall pattern, road surface quality and the permeability of the road’s margins and surrounding earthworks. At the margins the water should be routed into a drainage system. If a positive drainage system is provided then kerbs or gullies will intercept the surface flow and feed it to gulley pots and/or a piped drainage system. From there, water may be fed to some disposal system – this may be a soakaway to the ground or it may be to a surface water course. Normally road runoff will be given some treat­ment before it is disposed. Treatment will usually include solids settlement and oil separation.

In areas where land is available, the runoff may be fed into an open, vegetated, lateral ditch known as a swale (see Figs. 1.10 and 1.11). These can form part of “SUDS” (Sustainable Urban Drainage Systems). Together with filter strips, infil­tration trenches and basins, porous pavement surfaces, constructed wetlands (e. g. reedbeds) and detention and retention ponds, they tend to act as natural attenua­tors of contaminants that will be sorbed into the ditch lining and taken up into the vegetation which, periodically, can be cut and removed. They also act as sediment traps, removing suspended solids. Excess water that does eventually arrive at a sur­face water course, or that soaks down to the water table, will usually be relatively

Подпись: Fig. 1.10 A well designed and maintained roadside swale operating correctly in heavy rain. Reproduced by permission of Chris Jefferies Note: The grass-lined swale has a drainage grill set 300 mm above the base to encourage storage and infiltration of water into the ground.
Runoff

clean due to the natural attenuation processes encountered en route. However, this means of treating and disposing of water that potentially contains contaminants can­not be used unthinkingly. There are many natural environments that are “highly vul­nerable”. High vulnerability exists when a near-highway environment can be easily polluted by runoff water (for example, where seeping water provides drinking water or sustains a quality ecosystem). The rare, but critical, occurrence of an accidental spillage, e. g. following a tanker crash, can cause acute effects to down-gradient waters.

Planning

Подпись: Place a tissue-paper overlay on a measured floor plan to make a quick, accurate sketch.
image60

Planning is one of the most satisfying aspects of renovation. On paper, you can live imperially—fruit trees beneath the windows, Italian marble in the bathrooms. When you tire of that, you can remove the tiles and replant the trees… with an eraser. Of course, your finished plans will be a trade-off between what you’d pre­fer and what you can afford. Yet, during early stages of planning, feel free to let your imagina­tion run wild.

Creating a Home That Suits You

Your house should fit you. In the words of build­ing contractor Dean Rutherford, whose own home is featured near the end of this chapter, "For me, building is about creating a sense of who you are. A place of pause and reflection.

A place where you can be comfortable with your­self.” Indeed, a house should be an expression of who you are, your lifestyle, your loved ones, your dreams. So it’s helpful to begin planning by get­ting in touch with who you are, which isn’t always easy.

Few homeowners are good at conceptualizing spatially. Still fewer can draw well enough to con­vey their concepts to an architect. Thus one savvy architect asks his clients to write up a scenario for a happy day in a perfect house. He says it’s surprising how quickly the writing helps people move beyond physical trappings to describing the experiences that make them happy in a home.

For example, some people prefer to wake up slowly while reading in bed or having breakfast on the patio. They may want to putter in a secluded garden or host lavish candlelight din­ners. Whatever you wish for.

Подпись: If you plan to own a home for a long time, Подпись: WILL YOU LIVE THERE? making it comfortable should be your prime objective. With this goal, you can plan remodeling projects long-term and schedule them as time and money are available. Moreover, living in a house for a while is the best way to learn its strengths and shortcomings. Quick turn-arounds are trickier. During real estate booms you can make money by doing little more than refinishing floors and applying a fresh coat of paint. But timing the market is everything—and impossible to predict. Houses can also be illiquid (hard to sell) when interest rates rise and the economy slows. So even if you're speculating, buy a house you wouldn't mind living in, just in case you have to. Подпись: Whatever you enjoy most, home is the place where you get to do it. KEEP A RENOVATION NOTEBOOK

Much as you’d create a shopping list, jot down house-related thoughts as they occur and file them in a renovation notebook. A notebook is also a convenient place to stash ideas clipped from magazines and newspapers, along with photos you may have shot. If you have kids, encourage their contributions too. At some point, consolidate the notebook ideas and begin creat­ing a wish list of the features you’d like in your renovated home. This list will come in handy when you begin weighing design options.

Architects call items on the wish list program requirements and consider them an essential first step for planning because they establish written criteria against which you can later compare pro­posed improvements. The list should contain both objective, tangible requirements (such as the number of bedrooms and baths) and subjec­tive, intangible requirements (such as how the house should eventually feet). If you’re presently
living in the house you’ll renovate, you’ll have strong opinions about what inconveniences you’re willing to tolerate and what you’re not. Here are questions to help you get started.

Comfort. Start with your gut feelings. Are the rooms big enough? Ceilings high enough? Do you have enough bedrooms and storage? Enough room to do the things you like? How’s the traffic flow? Do some rooms have two approaches/exits? Or do most feel like dead ends? Must you walk through one bedroom to get to another?

Is the house too drafty? Warm enough? Do rooms receive enough sunlight? Does window screening take advantage of prevailing winds? Can you shut out street noise? Do you feel safe? Can you see who’s on the porch without opening the door? Is the house easy to keep clean? Will your furniture suit your design plans?

Cooking and dining. Do you cook a little or a lot? Do you entertain often? Do you have enough counter space? Are the sink and appliances ideally suited to your cooking preferences? Are counters the right height? Does your kitchen have useful continuous counter space or are the counters interrupted by doors, windows, and foot traffic? Can you reach all shelves? Is storage space suffi­cient? The refrigerator large enough?

Can you easily transport food to and from din­ing areas? Can people hang out while you cook? While cooking, do you like to talk on the phone or watch TV? If you recycle cans and bottles, do you have a place to put them?

For recommended minimum cabinet and counter dimensions and common kitchen config­urations, see pp. 302 and 303.

Being social. If you plan to entertain, will it be formal or informal? Small card parties with friends or 40-chair club meetings? Is the living room cozy? How about accommodations for overnight guests? Can you escape hubbub when you prefer solitude? That is, when the kids have friends over, do they drive you crazy? (Of course, this may have nothing to do with the house.) Bathrooms. Do you have enough bathrooms, or do jam-ups occur during rush hours? When everyone showers in the morning, do you have enough hot water? Is there a linen closet nearby? Enough cabinet space for sundries?

Do you have tubs and showers where needed? In the tub, can you relax and soak in peace? Is the tub big enough for two? Can you shower with­out leaving pools of water outside the tub or stall? Is your bathroom presentable for entertaining? Family doings. If you have small children, are surfaces easy to keep clean? Do you have places to store toys? Are other cabinets childproof? Is there an enclosed, outdoor, safe play area? A
room where kids can play on a rainy day? Do you have rooms conducive to reading and home­work? Do your kids have enough privacy? And room for their possessions? Will the rooms meet their needs in 5 years? When the kids move out, will your empty nest be too big?

Working at home. If you bring work home or simply work at home, do you have a room that’s adequate for it? Are the walls soundproofed so you can work in peace or work late without dis­turbing others? Are there enough electrical out­lets? How about adequate lighting? Can you shut a door, making your workspace safe from pets and toddlers?

Outer spaces. Do porches protect you from the rain while you’re searching for house keys? Does the yard receive enough sun for a garden? Do you need an outbuilding for lawn equipment and tools? A garage that can double as vehicle shelter and workshop? A spigot near the driveway for car washing? Do you cook out often? Need a fence for privacy or to screen off the neighbors? Need a deck or patio for entertaining outdoors?

Techniques READING FLOOR PLANS

Techniques READING FLOOR PLANS

BUILDING A HOUSE REQUIRES that you learn more than one new language. Besides the termi­nology of building (plates, braces, lined walls, plumb, toenail, and the like), there’s also the visual vocabulary of lines, symbols, and notations found on building plans. Fortunately, most of these sym­bols are fairly easy to understand (see the illustra­tion at right). It’s important to become familiar with building plans so that you can begin to visual­ize, from a two-dimensional representation, what the house will look like with the walls framed and the fixtures and appliances in place. It’s far easier (and less expensive) to make a change at the plan­ning stage than after the walls and rough plumbing are in place.

 

SYMBOLS USED ON FLOOR PLANS

Wall ——

Window

Door (and direction it opens)

Sliding doors Bifold doors

insulation Ш№ШШШ

 

Sink and Lavatory Q Q sink □ Lav

 

Bathtub I )

 

Techniques READING FLOOR PLANS
Techniques READING FLOOR PLANS

Techniques READING FLOOR PLANS

Подпись: With a section plan you can see most everything that goes into a wall or any other part of the house. ^ Wall sections to show the “guts” of the floors, walls, or ceilings. Think of a wall section drawing as an apple that’s been sliced in half to reveal its core (see the illus­tration at left). Both section and detail plans (sec below) are sometimes drawn at a larger scale to better identify the details that wouldn’t show up as clearly in a smaller scale.

ж Elevation plan to show how each side of the house will look. Elevation drawings show the foundation, wall height, siding and trim, roof style and pitch, and roof overhang at the eaves.

ж Detail plans to provide close-up views of small sections of the house. These are useful lor providing clarification or additional detail that isn’t shown in the other drawings.

Consultant or Contractor?

There are two schools of thought about whom to hire to perform a home-energy audit. One says that a disinterested third party is the most trustworthy opinion, while the other argues for the convenience of hiring someone who can pinpoint the improve­ments needed and then perform the work.

Brian Smith of Energy Saving Comfort Systems (www. escs1.com) prides himself on the fact that his company isn’t selling any­thing other than testing services. When he sits down with customers to review what his blower door and infrared camera have detect­ed, they know that "I’m not then going to try to sell them new windows or a furnace." CMC’s Luxton concurs: "We feel strongly that an audit should be performed by an unbiased person."

John Jennings is an energy auditor with Steven Winter Associates, an architecture/ engineering research and consulting firm in Norwalk, Conn. He favors the idea of inde­pendent auditors who can provide a list of vetted contractors that can make the recom­mended improvements.

Mike Rogers, senior vice president of busi­ness development for GreenHomes® Amer­ica, a Syracuse, N. Y., firm that tests homes and then does improvement work, disagrees. "Would you take your car to one guy to tell you what’s wrong with it and then to an­other to do the repairs?" he asks. Some com­panies, including GreenHomes, even have a financing program for energy-performance upgrades.

Chronic Illness from "Harmless" Pesticide

Barbara Adler was in good health until March 1996, when she experienced the sudden onset of severe migraine headaches, loss of energy, fre­quent dizzy spells, and difficulty concentrating. She consulted with a neurologist and many other health care practitioners overthe ensuing months, but none was able to help relieve her symptoms or shed light on the cause of her deteriorating health.

At some point in her search for wellness, she reviewed the journal she had been keeping in which she recorded significant events in her life. She noted that, around the time of the onset of her symptoms, her husband had purchased a bug spray from one of the local nurseries. He was told that the insecticide would be appropriate for the bugs on his houseplants. Barbara remembers that the bug spray smelled noxious to her, and she put some of the sprayed plants in the garage. She looked at the label on the bottle and saw that it contained Diazinon, a potent organophosphate

matoes), on golf courses, and for mosquito and fire ant control

• continued spot and local use for termite control until December 31, 2002

• use in new home pretreatment until De­cember 31, 2005

• unrestricted export

Inert ingredients, which can account for up to 99 percent of a pesticide, are not usually identified on the label. The Trade Secrets Act protects manufacturers from being required to fully disclose them even if the ingredients are potentially hazardous to human health. No studies of any kind are required on the in­known to have toxic effects on the nervous sys­tem. Barbara returned to the nursery to register a complaint and was told that Diazinon was not harmful.

Discussion

Although it is illegal for manufacturers to claim their pesticides are "safe," Dr. Elliott notes that in her experience local nurseries and other establish­ments selling pesticides frequently tell customers that organophosphates such as Sevin, Dursban, and Diazinon are harmless when applied accord­ing to instructions. In fact, many people with mul­tiple chemical sensitivity disorder attribute the onset of their illness to pesticide exposure. While the patient in the above case became ill after an acute exposure to which she reacted immediately, the majority of cases occur when repeated, low – level exposures cause a gradual decline in health and vitality.

ert ingredients. Many inert ingredients can be more toxic than the active ingredients, yet warning labels apply only to active ingredi­ents. In a Freedom of Information Act lawsuit, the Northwest Coalition for Alternatives to Pesticides (NCAP) obtained from the EPA a list of 1,400 of the 2,000 substances being used as inert ingredients in pesticides. These in­gredients included Chicago sludge and other hazardous waste, asbestos, and some banned chemicals such as DDT.6

A recent study found that combining pesticides can make them up to 1,600 times more potent.7 A good illustration of this syn­ergy is found in a class of pesticides called

Pesticide Facts

• A National Cancer Institute study indicated that the likelihood of a child contracting leukemia was more than six times greater in households where herbicides were used for lawn care.9

• According to a report in the American Jour­nal of Epidemiology; more children with brain tumors and other cancers were found to have had exposure to insecticides than children without cancer.10

• According to the New York State Attorney General’s office, 95 percent of the pesti­cides used on residential lawns are consid­ered probable carcinogens by the EPA.11

• 2,4-D was a component of Agent Orange and is used in about 1,500 lawn care prod­ucts.12

• Pesticides have been linked to the alarming rise in the rate of breast cancer.13

• Besides causing cancer, pesticides have the potential to cause infertility, birth defects, learning disorders, neurological disorders, allergies, multiple chemical sensitivities, and other disorders of the immune system.

pyrethroids, which are mistakenly thought to be harmless because they are plant-derived. The unlabeled inert ingredient commonly mixed with the pyrethroids is PBO (pipero – nyl butoxide). Alone, each substance has lim­ited toxicity to insect species; when they are combined, the mixture is extremely effective. PBO potentiates the pyrethroid by destroy­ing one of the enzymes in the detoxification pathway that deactivates the pesticide in the insect. Humans exposed to this mixture suffer impaired ability of the liver to metabolize tox­ins in the environment.

Biocides can be absorbed through the skin,

inhaled, or swallowed. Many building prod­ucts and household furnishings such as car­pets, paints, and wood products are treated with biocides. Infants and small children are more likely to be harmed by biocides because their developing organs and nervous systems are more easily damaged and because they are more likely to come into direct contact with treated carpets and lawns.

Pesticides can drift a long distance from the site of application, leaving residues through­out the surrounding community. Pesticides contaminate everything and everyone they contact. Residues are found in rain, fog, snow, food, water, livestock, wildlife, newborn babies, and even in the Arctic ice pack. People and pets may track pesticide residues into the house. An EPA study in Florida found the highest household pesticide residues in carpet dust.8

Pesticides may cause both acute and chronic health effects. Acute health effects ap­pear shortly after exposure. Chronic health effects may not be apparent until months or years later. Chronic effects generally result from long-term exposure to low levels of toxic chemicals but may also arise from short-term exposure. A tragic misconception about pesti­cides is that the potential for harm is primar­ily the result of acute or immediate poisoning. In fact, delayed effects pose the greatest prob­lems to human health. Many pesticides are fat soluble and bioaccumulate in tissues, where they can exert prolonged effects on the im­mune, endocrine, and nervous systems.

When building or remodeling a healthy home, you can lower your pesticide expo­sure by not treating the soil under the building and by eliminating or sealing standard build­ing products that contain biocides. Division

STEP 4 Secure the Building Permits

It’s not uncommon for builders or owner – builders to view the local building department as enemy turf. Let me suggest that your build­ing experience will be immeasurably more positive, productive, and efficient if you view the building department as a resource and think of the building inspector as someone who can help you. Certainly there are excep­

STEP 4 Secure the Building Permits

tions, as there are in any field, but, by and large, building departments and building inspectors exist to protect prospective home – owners from unscrupulous or incompetent builders and owner-builders from themselves. The building inspector knows the building codes, which have been developed over the years to ensure that safe, durable houses are built. Your building inspector has the same goals that vou do. He or she wants a house

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that doesn’t leak, isn’t a fire hazard, and can stand up to everyday use and all but the most severe natural disasters. Building inspectors really are on your side.

Taking the plans to a building department to request permits need not be a big affair. I have often submitted basic plans on 1 I-in. by

14- in. sheets of paper. Plans do need to be drawn to scale, and the most common scale is 14 in. – 1 ft.; this means that 1 in. on a plan equals 4 ft. in the actual house. Using graph paper can help with preliminary

PLOT OR SITE PLAN

 

STEP 4 Secure the Building Permits

Подпись:A plot plan lets you see, from above, the size of the lot and where your house will be placed on the land. It also shows where utilities like water and electricity are located.

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FLOOR PLAN

 

FOUNDATION PLAN

 

STEP 4 Secure the Building Permits

STEP 4 Secure the Building Permits

STEP 4 Secure the Building Permits

STEP 4 Secure the Building PermitsThis is the floor plan for a simple four bedroom house. With it you can see the size of the building, the arrangement of the living spaces, and the location of doors and windows.

designing, but an inexpensive computer-aided design (CAD) program makes professional­looking plans that are simple to draw and easy to change.

For a simple house, most building depart­ments need the basic types of drawings shown on pp. 12, 14, and 15:

a Plot or site plan to give an overall view from above, showing the shape and dimen­sions of the property and the size and loca­tion of the building.

a Foundation plan to show the location and size of the concrete footings, walls, and piers that will support the floor frame.

a Floor plan to provide a bird’s-eye view of the size and arrangement of living spaces. The floor plan shows the location and size of doors and windows and often the loca­tion of electrical, plumbing, and heating system components (see the symbols explained below). Even the location, spac­ing, and direction of the roof trusses can be found here.

Worker Protection during Removal of Lead-Based Paint

Workers involved in removal, containment, and handling of lead-based paint must be pro­tected against lead hazards. Blood poisoning has historically been a serious job hazard dur­ing bridge painting and likewise dangerous during the removal of lead-based paint. In addition, enclosing the work area to capture the blasting grit and waste paint creates a con­fined area for the workers, increasing the potential level of exposure and health risk.

Guidance developed by the U. S. Occupational Safety and Health Administration (OSHA) included in its publication Lead in Construction identifies proper health and safety procedures to be observed by painting contractors. The procedures generally require train­ing of employees, enclosure of the work area, decontamination of workers, the use of per­sonal protection and monitoring equipment, and decontamination of personnel and equipment when leaving the work space.

Unconfined removal of paint regardless of lead content presents environmental, health, and safety concerns. It has the potential to result in unacceptable deposition of dust and debris in roadways, streams, and communities, as well as presenting a hazard to workers.