Tag Archive for: Roofing Contractor Evergreen Park


When most people think of roofs, they typically think of shingles or metal roofing. But what some may not know is there’s another layer of protection directly on top of the roof deck and under the roof covering that performs a critical role in protecting your home from moisture damage. It’s called roofing underlayment.

Find out more about this critical component of your roof’s structure.

What Is Roofing Underlayment?

Roofing underlayment is what lies between the shingles and the roof sheathing, or roof deck, which is typically either plywood or OSB. It’s installed directly on the roof deck and provides a secondary layer of protection from the elements, including rain, snow, and wind.

Types of Roofing Underlayment

There are two main types of roofing underlayment:

  • Felt
  • Synthetic

Each product has its pros and cons, and the type you choose may depend on your geographical area, roofing materials used, roof design, budget, and what your roofing contractor may suggest.

Felt Roofing Underlayment

Felt roofing underlayment is one of the oldest types of roofing underlayment. It’s created by saturating paper or fiberglass mats with asphalt.

Felt roofing underlayment is typically available in two types: No.15 felt and No. 30 felt. Compared to No. 15 felt, No. 30 felt is typically thicker, stronger, and may be less prone to tearing or ripping off during installation or weather events.


The main advantage of using felt roofing underlayment is cost. Felt underlayment tends to cost less compared to the synthetic underlayment, which is why it’s often the go-to for budget-conscious homeowners.


There are several disadvantages to using felt underlayment on a roof. One disadvantage of traditional felt roofing underlayment is it generally can’t be left exposed for more than a few hours. The material may dry out or leach oils in the heat.  This would impact the felt’s ability to protect against moisture.

Other drawbacks of felt underlayment include:

  • Prone to tearing in high winds and during the strain of installation.
  • If exposed to moisture, the mat can absorb water and wrinkle the felt, making it harder for the shingles to lay flat.  Therefore, shingles should be installed immediately after felt roofing underlayment is installed if possible to ensure optimal protection.
  • Felt underlayment also weighs more, which can make it harder for roofing contractors to drag rolls of it up a ladder and onto a roof.
  • It also has a slippery surface, which can sometimes make it more difficult to install.
  • The weight also leads to less material per roll.  This means more potential seams instead of a single course with no laps.

Felt Roofing Underlayment and Warranties

If felt underlayment is installed it may also prevent you from being protected under the manufacturer’s warranty, which may require synthetic underlayment.

Synthetic Roofing Underlayment

For enhanced water resistance and protection from the elements, many roofers are choosing to go the route of synthetic roofing underlayment. These products are usually made from long-lasting polymers, which provide added strength and longevity. This type of underlayment is typically moisture-resistant, and when it’s installed correctly, it offers better protection from the weather compared to felt.

Synthetic roofing underlayment materials are not standardized, so different manufacturers may make their products differently, and therefore may have different levels of performance. Be sure to do your research and talk with a trusted contractor who can help guide you in selecting the right roofing materials to protect your home.


There are four main advantages to installing synthetic roof underlayment rather than felt. Compared to felt, synthetic roofing underlayment is:

  • Tough
  • Fast to install
  • Safe
  • Repels water
Synthetic underlayment has a tough and durable construction with an extremely high tear strength compared to felt.

Synthetic roof underlayment is extremely durable. It typically doesn’t tear and is suitable for extended UV and moisture exposure in some cases, which is especially helpful if there’s a bit of lead time before your roof covering is installed.

Synthetic underlayment also stands up to boot traffic, which is important when your roofing contractor is walking around on its surface as it’s being installed. At Owens Corning Roofing, we call this “use after abuse” — the product can still perform as designed even after the abuse it takes during installation.

Synthetic roofing underlayment also tends to be:

  • Lighter* – Up to four times lighter in some cases
  • Fast to install – Because there is more material per roll compared to felt (synthetic roofing underlayment comes in wider and longer rolls), it results in fewer trips up the ladder for your roofers, saving them time and perhaps helping the job move along faster. For instance, a typical 2700-square-foot home might require three rolls of synthetic underlayment compared to 14 rolls of No.30 felt to cover the same area.
  • Safe – Synthetic underlayment is also advantageous for worker safety — the surface of many synthetic roofing underlayments, including those offered by Owens Corning, features a variety of slip-resistant surfaces for enhanced walkability. It’s also usually well-marked with overlap guides and indicators of where fasteners should be placed, helping to improve consistency and accuracy during installation.
  • Moisture-resistant – Where felt products tend to absorb water, synthetic roofing underlayments are built to repel water. This is important for homeowners concerned about moisture infiltration, especially if they plan to leave the underlayment exposed for a prolonged period.

Because it’s made of plastic, synthetic underlayment is typically resistant to mold growth, a definite advantage over felt.


Many synthetics are competitively priced, but when compared to felt, the main drawback of synthetic roofing underlayment is the cost. The upfront investment in higher-quality roofing materials, however, could save you money down the road. You can’t put a price on the peace of mind of knowing that your roof is sufficiently protected from moisture.

The Right Underlayment for Your Roof

Whether you’re embarking on a reroofing project or new home construction, there are many factors to consider about the type of underlayment to use. Synthetic roofing underlayment has many advantages over felt and may be a worthwhile investment to protect your roof and home from the risks of water and moisture infiltration.

Learn more about our selection of roofing underlayment products and find an independent roofing contractor in the Owens Corning Roofing Contractor Network near you.

*9 (2 sq.) rolls of standard #30 felt compared to 2 (10 sq.) rolls of Owens Corning® Deck Defense® High-Performance Synthetic Underlayment. Individual product weights may vary.


Why Ventilate?

There are four main reasons to ventilate your
home’s attic space.

• Reduce Heat Gain and Reduce Energy Bills in the Summer
Radiant heat from the sun warms the roof and radiates into
the attic. If not properly vented out, it could radiate into the
living space affecting the comfort level inside the house
and contributing to higher utility bills (because appliances
such as fans/refrigerators/air conditioners may have to work
harder to keep your home cooler).
• Reduce Moisture and Condensation in the Winter
In northern climates, heated air from the home escapes into
the attic through openings in the walls or ceilings (such as
recessed lights, electrical chases, the attic access door, etc.).
Some of this moisture vapor rises to the colder/dryer attic
where it can potentially condense if not properly vented. If it
condenses, it could dampen the attic insulation (which could
weaken the R-value of the insulation), contributing to wood
rot, mold, mildew and poor indoor air quality.
• Fight Ice Dams
Ice Dams are formed when in winter conditions, heated air
from the home migrates into the unheated attic through
the ceiling, under insulated areas and through bypasses,
such as light fixtures or exhaust systems found in kitchens
and bathrooms. This creates warm areas on the roof
and unevenly melts the underside of the snow that has
accumulated on the roof. The melted snow flows down the
roof until it reaches a colder spot, such as the eaves, where it
refreezes, forming a back up of ice commonly called an ice
dam. The ice dam is a result of energy loss from inside the
house, which could cost a homeowner hundreds of dollars
or more. It could also lead to rotted roofs and rafters, ruined
insulation, moisture inside the walls, mold and peeling
paint. Proper attic ventilation can help prevent the conditions
that contribute to ice dams.
• Prolongs the Service Life of the Building Materials
Finally, the shingles and decking of your roofing system may
deteriorate prematurely due to heat and excessive moisture
buildup. By reducing the surface temperature of the shingles
and the existence of moisture on the underside of the
decking by properly ventilating the attic space, a homeowner
may be able to extend the life of both of these materials.


How to Ventilate

Effective Ventilation is achieved by providing
intake ventilation at the lower edge of your roof
and exhaust ventilation at the upper portion of
your roof. The flow of air from the lower portion
of the roof to the upper portion the upper portion

through these vents is often called the “stack effect,”

which is similar to how a chimney works.


How to
to avoid

Contractors and homeowners are urged to check
the following:
• Make sure two different types of exhaust vents are not on
the same roof of a common attic, so as to avoid possible
short-circuiting of the system (see Section 2 above).
• Make sure the intake vents are not covered with insulation.
To avoid this possibility be sure to insert attic insulation
baffles keeping the insulation away from the intake vents.
• Check that the intake vents have not been painted shut.
If they’ve been painted over that could restrict or reduce intake airflow.



If you’re considering sealing your attic instead
of ventilating your attic be sure to ask your
contractor these important questions:
• Where will all the internal moisture go?
• How can I visually inspect for a roof leak if the underside
of the deck is sealed with insulation?
• Will I have more of a threat with mold and mildew?
• How does this impact my shingle warranty?
• Will this cause more ice damming?


IS Green
Effective ventilation is achieved by providing
intake ventilation at the lower edge of your roof
and exhaust ventilation at the upper portion of
your roof. The flow of air from the lower portion
of the roof to the upper portion through these
vents is often called the “stack effect,” which is
similar to how a chimney operates.
Contractors and homeowners are urged to check
the following:
• Make sure two different types of exhaust vents are not on
the same roof of a common attic, so as to avoid possible
short-circuiting of the system (see Section 2 above).
• Make sure the intake vents are not covered with insulation.
To avoid this possibility be sure to insert attic insulation
baffles keeping the insulation away from the intake vents.
• Check that the intake vents have not been painted shut.
If they’ve been painted over that could restrict or reduce
intake airflow.
• If using vented soffit panels for intake ventilation (typically
made by siding manufacturers) check the net-free area
rating of the panels to ensure they allow proper intake
• Make sure bathroom, kitchen and dryer exhaust fans are
properly vented to the exterior of the house and not into
the attic cavity as this practice will add excess moisture
inside the attic.
If you’re considering sealing your attic instead
of ventilating your attic be sure to ask your
contractor these important questions:
• Where will all the internal moisture go?
• How can I visually inspect for a roof leak if the underside
of the deck is sealed with insulation?
• Will I have more of a threat with mold and mildew?
• How does this impact my shingle warranty?
• Will this cause more ice damming?
…and it’s contractor tested and trusted. A balanced
ventilation system allows fresh, dry air to flow into
your attic structure through your intake vents. As
this occurs, warm moist air is drawn through your
exhaust vents to the outside. This is what is known
as a passive ventilation system and is one of the
most energy-efficient systems in the industry, as it
requires no energy to run and can help reduce your
cooling bills in the summer time.

When installing a new roof, commercial property owners must consider the employees,
equipment and inventory they are protecting. With many different asphalt roofing products and
installation methods available on the market, it is important to understand how to choose the
right system and get the most from an investment.
What Types of Roofing Systems Are Available?
A whole-system approach to low-slope roofing utilizes
long-term durability and redundant layers to provide
some of the best protection and reliability available.
Options include the following:
• Built-Up Roofing (BUR)
• Atactic Polypropylene (APP)
• Styrene Butadiene Styrene (SBS) modified systems
How Do These Roofing Systems Protect a
Building and its Assets?
Base sheets, interplies and cap sheets work
with asphalt and adhesives to create a longlasting, durable and redundant installation
comprised of multiple layers that provide a
water-resistant barrier.
What Are the Different Installation Options?
Different roofing systems can be applied in a variety of ways, including:
• cold-adhesive technology
• heat-welding
• hot asphalt
• self-adhering
How Do I Ensure My Roof is Installed Properly?
Prior to work beginning, ask your installer for the manufacturers’ system specifications to make
sure products are compatible. You can also request documentation of conformance to the
industry testing requirements from Underwriters Laboratories (UL), FM Approvals and ASTM
International. This documentation will demonstrate that the various components used in the
construction of your roofing system have been properly evaluated.

For commercial buildings, asphaltic low-slope roofing provides the highest
level of quality, affordability and reliability on the market. Most commercial
facilities use low-slope roofing because it is cost-efficient, maximizes usable
space and can be designed to feature value-adding amenities such as HVAC
equipment or a roof garden.
Though a flat roof may appear
level, it actually must have a
slight slope so that water can
run off the surface. Asphaltic
low-slope roofing is the
strongest option for
waterproofing because its
redundancies and reliability
provide added support and
protection for a building
which water cannot
There are two types of asphaltic low slope roofing. Built-up Roofing (BUR) and Modified
Bitumen (MB).
BUR is “built-up” of alternating layers of heavy roofing felt and hot mopped or coldapplied asphalt. The surface is finished with a mineral or gravel covering and a special
coating, which safeguards it from the sun and adds fire resistance. Recent installation
advances have included peel-and-stick self-adhesive products and low-fuming asphalt
The redundancy of
BUR systems make
them ideal for
hosting overburdens
such as solar panel
MB systems are referred to as being ‘modified’ because the asphalt has been blended with
polymers—usually either atactic polypropylene (APP) or styrene butadiene styrene
(SBS)—to improve the product’s strength, flexibility and resistance to solar radiation. MB
provides the features of a built-up roof with the added tensile strength and elongation of a
modified bitumen cap sheet, as well as the quality assurance of in-plant membrane
fabrication uniformity and control, and reduced labor requirements for installation.
MB systems
provide added
strength and are
affordable &
reliable to install.
Asphalt low-slope roofing has a number of beneficial attributes which make it
an asset to building owners and facility managers.
• Multi-layer protection, redundancy reduces chance of leaks
• Thermal performance
• Fire and uplift performance
• Seals concrete decks
• Versatile; suited to all types of roof decks
• Today’s formulas resist weathering
• Adaptable to meet any penetration or flashing detail
• Most cost-effective choice for commercial structures
• Withstands high-foot traffic
• Existing systems can be easily repaired by a roofing professional
• Easy to find contractors to install
• Versatile systems and products
• Inexpensive over entire life cycle
• “Best bang for the buck”
• Versatile options – choose the right system for your budget
• Existing systems can be modified to become “cool” and energy efficient
• Existing structures can be modified to accommodate “green” vegetative roofing
• New industry advances embracing sustainability of product
• Materials may be recycled
Attributes Continued…
Asphalt roofing is a system above the rest…
Low-slope roofs on industrial and institutional buildings share many common
• The low-slope of the roof affects its ability to shed water
• High-foot traffic when servicing equipment can cause wear and tear
• Multiple penetrations could affect the waterproofing system
In all of these cases, asphalt roofing offers the solution!

It’s About Saving Energy.
There are many options available to help assure that your roof, whether low-slope or steep-slope,
reduces energy use and saves you money.
• In fact, many states are instituting building codes that require roof systems to be energy
• There are many rebate programs available in the marketplace to learn about potential rebates.
For more information on energy efficiency rebates in your state please
visit: http://www.dsireusa.org/
Why is Reflectivity Important?
Reflective roofs are one option
Reflectivity can help reduce the heating and cooling costs associated with commercial buildings or
residences by reflecting the heat generated by the sun back into the environment.
There are several ways to accomplish energy savings and still maintain the look and performance you
have come to expect with asphaltic roofing.
The “Whole Building Envelope” approach encourages the use of insulation to reduce heating and
cooling costs.
• Most states with energy requirements for roofing
allow an “insulation trade-off.” Adding additional
insulation to a roofing system in Northern Climates is
another effective way to save energy in addition to a
highly reflective roof surface. Additionally, in these
climates where heating days exceed the cooling days,
the building owner may achieve a better energy
efficiency and avoid a heating penalty.
• Many energy calculators are available and can tell you
how much insulation you need to use if you like the look
of a non-reflective roof covering.
How Do Reflective Roofing Systems Work?
A reflective roof system absorbs less of the sun’s energy by reflecting back into the environment
the heat that could be absorbed by dark roofing. Roofs that don’t absorb heat lessen the load on
AC units, helping equipment last longer and lowering energy bills.
What Options Are Available?
Choose the asphalt roofing system you like then consider the following:
• Factory surfacing with reflective performance
• The “Insulation Trade-Off”
• Reflective coatings over some non-reflective low-slope membranes
• Vegetative over-burdens (garden roofs) may also help meet energy efficient building codes
Key Terms to Look For…
• Reflectivity
• Emissivity
Bottom Line.
There are plenty of energy efficient reflective options with asphaltic roofing technology, the performance you
can count on.

Why is ventilation important?
Proper ventilation reduces moisture build-up in your home
• The average family of four generates approximately 2 to 4 gallons of water vapor
each day through activities such as breathing, perspiration, showering, cooking and
• When moisture vapor remains in a colder/dryer attic, it can potentially condense
damaging your roof deck and insulation.
• In cold weather climates, ice dams can form along your eave edge increasing
the chance of a roof leak and damage to your gutters.
• Excess moisture may also lead to moisture build-up in your insulation, which
can lessen the insulating value over time, and even lead to mold build-up in
your attic
Proper ventilated spaces reduce the Stack Effect by pushing warm, moist air out of the
attic space. In addition to moisture build-up, proper ventilation also reduces heat
build-up in your attic.
• Improper ventilation can lead to premature deterioration of your shingles and roof
• Proper ventilation means your attic stays cooler, reducing load on your air
conditioning units. The less your AC unit works, the longer it will last, likely
resulting in lower cooling bills.
How much ventilation do I need?
• A balanced ventilation system is best. A balanced system is where intake
ventilation at the eave areas is equaled at or near the ridge area.
• Minimum ventilation requirements are 1 sq. ft. unobstructed or net free area of
ventilation for every 300 sq. ft. of attic space.
• The preferred ration is 1 sq. ft. of net free area of ventilation to every 150 feet of
attic space. In order to qualify for a FHA loan, ventilation must meet the 1/150
rule. Many calculators to help you plan the right amount of ventilation for your
home and the ventilation system you select are available.
• There are different styles of ventilation systems available; many are 100% green,
utilizing no electrical power.
Can I over ventilate?
If the system is not balanced at the top or ridge area, or if there were gable end vents
with ridge vents, without adequate soffit ventilation you may actually pull moisture
into the home during a heavy rain or snow storm.
The exception to the balance rule is at the soffit in passive systems. Since the air that
enters at the soffit acts to push out moisture and warm air, having extra soffit
ventilation will not create an off-balance system.

It can be argued that the most visible, distinguishing and important part of a home is the roof. The roof generally represents about
40% of the visual exterior of a typical home and therefore plays an important role in its overall aesthetics. Most buyers in the
market for a home will eliminate from consideration any home that does not have curb appeal for them. That’s why four out of
five residential roofs in the United States today boast beautiful, affordable and reliable asphalt shingles.
What are the material options for residential roofs?
Today’s homeowner has a number of options when it comes to the style, material and color of their roof. Asphalt shingles are by
far the most common option, with metal, clay tile, concrete tile, slate and cedar shake as alternatives.
The majority of residential roofs in the U.S. don asphalt shingles because they are beautiful, affordable, reliable and low
Another material featured on a fraction of homes in the U.S. is metal roofing. While metal roofs are environmentally friendly and
not as costly as stone-like materials such as clay tiles and slate, they are still more expensive than asphalt shingles and require a
much more intricate installation.
What are some of the considerations when thinking about a metal roof?
In addition to high cost and difficult installation, homeowners also need to think through the following when considering a metal
• Care must be taken on large roofs to provide for thermal expansion and movement
• Movement caused by differences in temperature may cause objectionable noises in some roofs; for example, curved roof
• Condensation accumulation issues can arise, such as rust, discoloration and mold
• Care must be taken to avoid the use of incompatible materials, as dissimilar metals can cause unexpected and rapid
• Metal refining, production and transport of metal roof components can be energy-intensive and is typically a non-local
• Support structure for metal required over older roofing systems (retrofit)
• There are a limited number of Contractor Training Programs
• Absence of skilled contractors
• Lack of organized codes and standards
• Repair, matching and cut-lists
• Lead time
• Walkability
• Accessories like snow jacks
• Maintenance issues with metal
– SH1 Rating
– Re-coating
– Wind-uplift warranties
• Repair and matching
• Exposed fasteners—back out
What are the benefits of asphalt shingles?
For the past 150 years, asphalt shingles have proved the most popular roofing material in North America. The benefits are
abundant and include:
• Versatility/Aesthetic options
– Color range
– Style range
– Natural look
– EnergyStar compliant options
– Reliability/performance
• Affordability
– Life cycle cost
– Low installation cost
• Sustainability
– Energy efficient
– Cool roofing/reflectivity
– Recyclability
• Quality
– Durability
– Ease of installation
– Fire and wind resistance

If I select asphalt shingles, what is my return on investment?
The majority of home owners will base their roofing decision on cost, ease of maintenance and longevity. Asphalt shingles fulfill all three
categories while also offering a range of color, style and eco-friendly options. Careful selection of a roofing material will reduce longterm costs for you and the environment.
• Life Cycle Cost Number
• Warranties (third party source)
• Time and Cost for Installer

Tag Archive for: Roofing Contractor Evergreen Park