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Nancy
Guzman is an Expert Realtor for the Metro Denver Colorado area, who can help
you decide where to live. Because, Nancy understands finding your
special place means taking in many factors that include accessibility to
work, education and recreational activities. It also includes the size
and style of your home, the style of the neighborhood that will make you
feel more at home. All of these factors must come together to make
your new Metro Denver Colorado home, feel like home.
Roof
Checkup Guide
Perform a checkup on your roof system in the fall and spring to help
diagnose potential problems early.
When cleaning your gutters or inspecting your roof system,
remember important ladder safety tips:
- Make sure the ladder is on solid, level ground.
- Secure the ladder at the top to prevent it from slipping.
- Inspect the ladder, rungs and rails for damage.
- Extend the ladder at least 3 feet beyond the gutter, and angle
it 1 foot back from the house for every 4 feet in eave height.
- Always use both hands when climbing the ladder.
Once on the ladder, you should look for:
- Shingles that are buckling, curling or blistering; this
indicates the end of the shingles' life expectancy.
- Loose material or wear around chimneys, pipes and other
penetrations.
- Excessive amounts of shingle granules in your gutters;
granules give shingles added weight and protect them from
ultraviolet rays.
Before you hire a roofing contractor, do your homework:
- Check for a contractor's permanent place of business,
telephone number and tax identification number.
- Check references from prior customers.
- Ask for proof of insurance (liability and workers'
compensation).
- Ask the contractor about material and workmanship warranties.
Use the following form to record your roof system's checkup each
fall and spring.
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roof system's health
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Checkup
date |
Fall
2000 |
Spring |
Fall |
Spring |
Fall |
Spring |
Cleaned
gutters |
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Checked
shingles |
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Inspected
around
chimneys
and pipes |
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Checked
interior
walls and
ceilings
for water
damage |
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Called a
professional
roofing
contractor |
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If you diagnose a problem, hire a
professional roofing contractor.
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ROOF SYSTEM COMPONENTS
All steep-slope roof systems (i.e.,
roofs with slopes of 25 percent or more) have five basic components:
- Roof covering: shingles, tile, slate or metal and
underlayment that protect the sheathing from weather.
- Sheathing: boards or sheet material that are fastened
to roof rafters to cover a house or building.
- Roof structure: rafters and trusses constructed to
support the sheathing.
- Flashing: sheet metal or other material installed into
a roof system's various joints and valleys to prevent water
seepage.
- Drainage: a roof system's design features, such as
shape, slope and layout that affect its ability to shed water.
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CHOOSING A ROOF SYSTEM
There are a number of things to consider
when selecting a new roof system. Of course, cost and durability
head the list, but aesthetics and architectural style are important,
too. The right roof system for your home or building is one that
balances these five considerations. The following roofing products
commonly are used for steep-slope structures.
Asphalt shingles possess an overwhelming share of the U.S.
steep-slope roofing market and can be reinforced with organic or
fiberglass materials. Although asphalt shingles reinforced with
organic felts have been around much longer, fiberglass-reinforced
products now dominate the market.
Organic shingles consist of a cellulose-fiber (i.e., wood)
base that is saturated with asphalt and coated with colored
mineral granules.
Fiberglass shingles consist of a fiberglass mat,
top-and-bottom layers of asphalt, and mineral granules.
Asphalt shingles' fire resistances, like most other roofing
materials, are categorized by Class A, B or C. Class A signifies the
most fire-resistant; Classes B and C denote less fire resistance.
Generally, most fiberglass shingles have Class A fire ratings, and
most organic shingles have Class C ratings.
A shingle's reinforcement has little effect on its appearance.
Organic and fiberglass products are available in laminated
(architectural) grades that offer a textured appearance. Zinc or
copper-coated ceramic granules also can be applied to organic or
fiberglass products to protect against algae attack, a common
problem in warm, humid parts of the United States. Both types of
shingles also are available in a variety of colors.
Regardless of their reinforcing type and appearance, asphalt
shingles' physical characteristics vary significantly. When
installing asphalt shingles, NRCA recommends use of shingles that
comply with American Society for Testing and Materials (ASTM)
standards-ASTM D 225 for organic shingles and ASTM D 3462 for
fiberglass shingles. These standards govern the composition and
physical properties of asphalt shingles; not all asphalt shingles on
the market comply with these standards. If a shingle product
complies with one of these standards, it is typically noted in the
manufacturer's product literature and on the package wrapper.
Wood shingles and shakes are made from cedar, redwood,
southern pine and other woods; their natural look is popular in
California, the Northwest and parts of the Midwest. Wood shingles
are machinesawn; shakes are handmade and rougher looking. A point to
consider: Some local building codes limit the use of wood shingles
and shakes because of concerns about fire resistance. Many wood
shingles and shakes only have Class C fire ratings or no ratings at
all. However, Class A fire ratings are available for certain wood
shingle products that incorporate a factory-applied, fire-resistant
treatment.
Tile—clay or concrete—is a durable roofing material.
Mission and Spanish-style round-topped tiles are used widely in the
Southwest and Florida, and flat styles also are available to create
French and English looks. Tile is available in a variety of colors
and finishes. Tile is heavy. If you are replacing another type of
roof system with tile, you will need to verify that the structure
can support the load.
Slate is quarried in the United States in Vermont, New York,
Pennsylvania and Virginia. It is available in different colors and
grades, depending on its origin. Considered virtually
indestructible, it is, however, more expensive than other roofing
materials. In addition, its application requires special skill and
experience. Many old homes, especially in the Northeast, still are
protected by this long-lasting roofing material.
Metal, primarily thought of as a low-slope roofing material,
has been found to be a roofing alternative for home and building
owners with steep-slope roofs. There are two types of metal roofing
products: panels and shingles. Numerous metal panel shapes and
configurations exist. Metal shingles typically are intended to
simulate traditional roof coverings, such as wood shakes, shingles
and tile. Apart from metal roofing's longevity, metal shingles are
relatively lightweight, have a greater resistance to adverse weather
and can be aesthetically pleasing. Some have Class A fire ratings.
Synthetic roofing products simulate various traditional roof
coverings, such as slate and wood shingles and shakes. However, they
do not necessarily have the same properties.
Before making a buying decision, NRCA recommends that you look at
full-size samples of a proposed product, as well as manufacturers'
brochures. It also is a good idea to visit a building that is roofed
with a particular product.
VENTILATION AND INSULATION ARE KEY
One of the most critical factors in roof system durability is proper
ventilation. Without it, heat and moisture build up in an attic area
and combine to cause rafters and sheathing to rot, shingles to
buckle, and insulation to lose its effectiveness.
Therefore, it is important never to block off sources of roof
ventilation, such as louvers, ridge vents or soffit vents, even in
winter. Proper attic ventilation will help prevent structural damage
caused by moisture, increase roofing material life, reduce energy
consumption and enhance the comfort level of the rooms below the
attic.
In addition to the free flow of air, insulation plays a key role in
proper attic ventilation. An ideal attic has:
- A gap-free layer of insulation on the attic floor to protect
the house below from heat gain or loss.
- A vapor retarder under the insulation and next to the ceiling
to stop moisture from rising into the attic.
- Enough open, vented spaces to allow air to pass in and out
freely.
- A minimum of 1 inch between the insulation and roof sheathing.
The requirements for proper attic ventilation may vary greatly,
depending on the part of the United States in which a home or
building is located, as well as the structure's conditions, such as
exposure to the sun, shade and atmospheric humidity. Nevertheless,
the general ventilation formula is based on the length and width of
the attic. NRCA recommends a minimum of 1 square foot of free vent
area for each 150 square feet of attic floor—with vents placed
proportionately at the eaves (e.g., soffits) and at or near the
ridge.
EVEN ROOFS HAVE ENEMIES
A roof system's performance is affected by numerous factors. Knowing
about the following will help you make informed roof system buying
decisions:
- Sun: Heat and ultraviolet rays cause roofing materials
to deteriorate over time. Deterioration can occur faster on the
sides facing west or south.
- Rain: When water gets underneath shingles, shakes or
other roofing materials, it can work its way to the roof deck
and cause the roof structure to rot. Extra moisture encourages
mildew and rot elsewhere in a house, including walls, ceilings,
insulation and electrical systems.
- Wind: High winds can lift shingles' edges (or other
roofing materials) and force water and debris underneath them.
Extremely high winds can cause extensive damage.
- Snow and ice: Melting snow often refreezes at a roof's
overhang where the surface is cooler, forming an ice dam. This
blocks proper drainage into the gutter. Water backs up under the
shingles (or other roofing materials) and seeps into the
interior. During the early melt stages, gutters and downspouts
can be the first to fill with ice and be damaged beyond repair
or even torn off a house or building.
- Condensation: Condensation can result from the buildup
of relatively warm, moisture-laden air. Moisture in a poorly
ventilated attic promotes decay of wood sheathing and rafters,
possibly destroying a roof structure. Sufficient attic
ventilation can be achieved by installing larger or additional
vents and will help alleviate problems because the attic air
temperature will be closer to the outside air temperature.
- Moss and algae: Moss can grow on moist wood shingles
and shakes. Once it grows, moss holds even more moisture to a
roof system's surface, causing rot. In addition, moss roots also
can work their way into a wood deck and structure. Algae also
grows in damp, shaded areas on wood or asphalt shingle roof
systems. Besides creating a black-green stain, algae can retain
moisture, causing rot and deterioration. Trees and bushes should
be trimmed away from homes and buildings to eliminate damp,
shaded areas, and gutters should be kept clean to ensure good
drainage.
- Trees and leaves: Tree branches touching a roof will
scratch and gouge roofing materials when the branches are blown
by the wind. Falling branches from overhanging trees can damage,
or even puncture, shingles and other roofing materials. Leaves
on a roof system's surface retain moisture and cause rot, and
leaves in the gutters block drainage.
- Missing or torn shingles: The key to a roof system's
effectiveness is complete protection. When shingles are missing
or torn off, a roof structure and home or building interior are
vulnerable to water damage and rot. The problem is likely to
spread-nearby shingles also are ripped easily or blown away.
Missing or torn shingles should be replaced as soon as possible.
- Shingle deterioration: When shingles are old and worn
out, they curl, split and lose their waterproofing
effectiveness. Weakened shingles easily are blown off, torn or
lifted by wind gusts. The end result is structural rot and
interior damage. A deteriorated roof system only gets worse with
time-it should be replaced as soon as possible.
- Flashing deterioration: Many apparent roof leaks really
are flashing leaks. Without good, tight flashings around
chimneys, vents, skylights and wall/roof junctions, water can
enter a home or building and cause damage to walls, ceilings,
insulation and electrical systems. Flashings should be checked
as part of a biannual roof inspection and gutter cleaning.
CHOOSING A CONTRACTOR
Buying a new roof system is an important investment. Before you
spend your money, spend time learning how to evaluate roofing
contractors. You should insist on working with a professional
roofing contractor. NRCA wants to assist you in getting the kind of
results you expect—a quality roof system at a fair price. All
roofing contractors are not alike, and NRCA recommends that you
prequalify roofing contractors to get the job done right the first
time. The following guidelines will help you select a professional:
- Check for a permanent place of business, telephone number, tax
identification number and, where applicable, a business license.
- Don't hesitate to ask a roofing contractor for proof of
insurance. In fact, insist on seeing copies of his liability
coverage and workers' compensation certificates. Make sure the
coverages are in effect through the duration of the job. Many
building and home owners have been dragged into litigation
involving uninsured roofing contractors. Also, if a contractor
is not properly insured, you may be liable for accidents that
occur on your property.
- Check to see if the roofing contractor is properly licensed or
bonded. Some states have specific licensing requirements, and
others do not. Your state's Department of Professional
Regulation or Licensing Board will have this information.
- Make sure the contractor is financially stable. A professional
roofing contractor can provide current financial information
about his company.
- Look for a company with a proven track record that offers
client references and a list of completed projects. Call these
clients to find out whether they were satisfied.
- Insist on a detailed, written proposal and examine it for
complete descriptions of the work and spec ifications, including
approximate starting and completion dates and payment
procedures.
- Have the contractor list the roofing manufacturers with which
his firm is a licensed or approved applicator. Most roof systems
require special application expertise to achieve lasting
quality.
- Have the contractor explain his project supervision and
quality-control procedures. Request the name of the person who
will be in charge of your project, how many workers will be
required and estimated completion time.
- Check to see if the contractor is a member of any regional or
national industry associations, such as NRCA. Being a member of
industry associations demonstrates a commitment to
professionalism.
- Call your local Better Business Bureau or Department of
Professional Regulation to check for possible complaints filed
against the contractor.
- Carefully read and understand any roofing warranties offered,
and watch for provisions that would void it.
- Choose a company committed to worker safety and education. Ask
the contractor what type of safety training he provides for his
workers and what industry education programs they have attended.
The best roofing contractor is only as good as the workers who
install the roof system.
- Keep a healthy skepticism about the lowest bid. If it sounds
too good to be true, it probably is. Many fly-by-night
contractors' below-cost bids seem attractive, but these
contractors often are uninsured and perform substandard work.
Remember, price is only one of the criteria for selecting a
roofing contractor. Professionalism, experience and quality
workmanship also should weigh heavily in your decision.
COMMONLY ASKED QUESTIONS
Q: How can a home owner recognize when a roof system has
problems?
A: All too often, roof system problems are discovered after
leaking or other serious damage occurs. Periodic (twice-a-year)
inspections often can uncover cracked, warped or missing shingles;
loose seams and deteriorated flashings; excessive surface granules
accumulating in the gutters or downspouts; and other visible signs
of roof system problems. Indoors, look for cracked paint, discolored
plasterboard and peeling wallpaper as signs of damaged roof areas.
Q: What are my options if I decide to reroof?
A: You have two basic options: You can choose a complete
replacement of the roof system, involving a tear-off of your
existing roof system, or re-cover the existing roof system,
involving only the installation of a new roof system. If you've
already had one re-cover installed on your original roof system,
check with a professional roofing contractor. In many instances,
building code requirements allow no more than one roof system
re-cover before a complete replacement is necessary.
Q: My roof leaks. Do I need to have it replaced completely?
A: Not necessarily. Leaks can result from flashings that have
come loose or a section of the roof system being damaged. A complete
roof system failure, however, generally is irreversible and a result
of improper installation or choice of materials or the roof system
installation is inappropriate for the home or building.
Q: Can I do the work myself?
A: Most work should not be done yourself. Professional
roofing contractors are trained to safely and efficiently repair or
replace roof systems. You can damage your roof system by using
improper roofing techniques and severely injure yourself by falling
off or through the roof.
Maintenance performed by home and building owners should be confined
to inspecting roof systems during the fall and spring to check for
cracked or curling shingles and cleaning gutters filled with dead
leaves and other debris. If you must inspect your roof system
yourself, use a firmly braced or tied-off ladder equipped with
rubber safety feet. Wear rubber-soled shoes and stay on the ladder
(and off the roof system), if possible.
Q: How long can I expect my roof system to last?
A: Most new roof systems are designed to provide useful
service for about 20 years. Some roof system types, such as slate,
clay tile and certain metal (e.g., copper) systems, can last longer.
Actual roof system life span is determined by a number of factors,
including local climatic and environmental conditions, proper
building and roof system design, material quality and suitability,
proper application and adequate roof maintenance.
Roofing product manufacturers offer a variety of warranties on their
products. Take a close look at those warranties to see what
responsibilities and financial obligations manufacturers will assume
if their products fail to reach their expected lives.
Q: What will a new roof system cost?
A: The price of a new roof system varies widely, depending on
such things as the materials selected, contractor doing the work,
home or building, location of the home or building, local labor
rates and time of year. To get a good idea of price for your roof
system, get three or four proposals from reputable contractors in
your area. Keep in mind that price is only one factor, and it must
be balanced with the quality of the materials and workmanship.
For each roofing material, there are different grades and
corresponding prices. There also are a variety of styles and shapes.
You need to look at the full product range and make a choice based
on your budget and needs.
Within the roofing profession, there are different levels of
expertise and craftsmanship. Insist on a contractor who is committed
to quality work.
Q: How can I determine my annual roofing cost?
A: When considering your roofing options, the following
formula may help:
Total Cost (Materials and Labor) ÷ Life Expectancy of Roof System
(in years) = Annual Roofing Cost |
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TERMS YOU SHOULD KNOW
Deck/sheathing: The surface,
usually plywood or oriented strand board (OSB), to which roofing
materials are applied.
Dormer: A small structure projecting from a sloped roof,
usually with a window.
Drip edge: An L-shaped strip (usually metal) installed along
roof edges to allow water run off to drip clear of the deck, eaves
and siding.
Eave: The horizontal lower edge of a sloped roof.
Fascia: A flat board, band or face located at a cornice's
outer edge.
Felt/underlayment: A sheet of asphalt-saturated material
(often called tar paper) used as a secondary layer of protection for
the roof deck.
Fire rating: System for classifying the fire resistances of
various materials. Roofing materials are rated Class A, B or C, with
Class A materials having the highest resistance to fire originating
outside the structure.
Flashing: Pieces of metal used to prevent the seepage of
water around any intersection or projection in a roof system, such
as vent pipes, chimneys, valleys and joints at vertical walls.
Louvers: Slatted devices installed in a gable or soffit (the
underside of eaves) to ventilate the space below a roof deck and
equalize air temperature and moisture.
Oriented strand board (OSB): Roof deck panels (4 by 8 feet)
made of narrow bits of wood, installed lengthwise and crosswise in
layers, and held together with a resin glue. OSB often is used as a
substitute for plywood sheets.
Penetrations: Vents, pipes, stacks, chimneys-anything that
penetrates a roof deck.
Rafters: The supporting framing to which a roof deck is
attached.
Rake: The inclined edge of a roof over a wall.
Ridge: The top edge of two intersecting sloping roof
surfaces.
Sheathing: The boards or sheet materials that are fastened to
rafters to cover a house or building.
Slope: Measured by rise in inches for each 12 inches of
horizontal run: A roof with a 4-in-12 slope rises 4 inches for every
foot of horizontal distance.
Square: The common measurement for roof area. One square is
100 square feet (10 by 10 feet).
Truss: Engineered components that supplement rafters in many
newer homes and buildings. Trusses are designed for specific
applications and cannot be cut or altered.
Valley: The angle formed at the intersection of two sloping
roof surfaces.
Vapor retarder: A material designed to restrict the passage
of water vapor through a roof system or wall. |
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