Typar Housewrap
70 Old Hickory Blvd.
Old Hickory, TN 37138-3651
Toll Free: (800) 284-2780
Fax: (615) 847-7045
Web site: http://www.typarhousewrap.com

Typar RoofWrap

Typar RoofWrap 30 is a high strength polypropylene roofing underlayment. It's a tough, weather-resistant fabric, developed to protect homes under the harshest conditions in North America. The ideal choice under shingles, shakes, tiles, slate and metal roofs, it resists tearing away from nails-even in high winds.

WATER'S TOUGHEST OPPONENT.

Typar RoofWrap 30 creates a secondary water barrier that reduces the incidence of leaks caused by storm damage, wind driven rain, ice dams, and worn finish materials.

FAST, EASY INSTALLATION.

• Lightweight and easy to handle
• Seven times lighter than No. 30 felt
• One roll covers the same area as five rolls of felt
• Cost effective -- fewer callbacks and re-felts

WEATHER PROTECTION -- During Construction

• Water resistant, even after prolonged exposure
• Use as a temporary covering for up to 6 months

WEATHER PROTECTION -- Over Time

• Secondary water barrier for added protection from driving rain and snow
• Still there when the finishing material comes to the end of its useful life

BENEFITS BEYOND BRUTE STRENGTH.

Typar RoofWrap 30 meets all national building codes. It won't dry out in high temperatures, and won't crack or become brittle in cold temperatures. Typar RoofWrap 30 won't rot and contains no asphalt, so it won't melt.

TOUGH PRODUCT. TOUGHER WARRANTY.

Typar RoofWrap 30 carries a 20-year guarantee when installed according to manufacturer's conditions. That means even if the roofing finish fails, Typar RoofWrap 30 is there to back it.

DEFENSE AGAINST MOLD

Mold poses significant problems to builders and homeowners. Unchecked mold growth on interior wood, wallpaper and carpet has been blamed for serious illnesses. It can be exceedingly difficult to eradicate and has even rendered some buildings uninhabitable. Mold develops in damp spots and where excessive moisture or water is present and so controlling moisture helps to control mold. Typar RoofWrap 30 helps prevent leaks in the building envelope that contribute to the growth of mold.

PROTECTION AGAINST LEAKS

The life of a roof depends on the type of roofing materials used and the quality of those materials. Light weight asphalt fiberglass-based shingles can be expected to last 15 to 20 years, whereas slate can last 75 to 150 years, depending on local conditions.
During cold weather ice dams can result from alternate thawing and freezing of snow on the roof and is caused by poor insulation or bad ventilation. Trapped water backs up under shingles and leaks into the house.
Typar RoofWrap 30 is a secondary water barrier that reduces the incidence of leaks caused by storm damage, wind driven rain, ice dams and finish materials that are approaching the end of their useful lives.

WATER'S TOUGHEST OPPONENT.

Typar RoofWrap 30 creates a secondary water barrier that reduces the incidence of leaks caused by storm damage, wind driven rain, ice dams, and worn finish materials.

FAST, EASY INSTALLATION.

• Lightweight and easy to handle
• Seven times lighter than No. 30 felt
• One roll covers the same area as five rolls of felt
• Cost effective -- fewer callbacks and re-felts

WEATHER PROTECTION -- During Construction

• Water resistant, even after prolonged exposure
• Use as a temporary covering for up to 6 months

WEATHER PROTECTION -- Over Time

• Secondary water barrier for added protection from driving rain and snow
• Still there when the finishing material comes to the end of its useful life

Installation

Preparation

• Repairs to the deck or sheathing should be complete and the area swept clean before installation. Every person working on the roof needs to fully understand and comply with the safety precautions included with this guide.
• In severe climates, install Typar RoofWrap 30 after Ice & Water Shield. Install a drip edge along the eaves before applying underlayment and along the rakes after applying underlayment.
• Use 1-inch diameter plastic cap roofing or underlayment nails to fix Typar RoofWrap 30 in position. Nails should be driven squarely into the deck and flush with the underlayment. Staples should only be used if roof finishing material will be installed immediately. The use of pneumatic staple guns is not recommended.

First course

• Beginning at a bottom corner of the roof, lay Typar RoofWrap 30 in horizontal courses with printed side up.
• Unravel 2 or 3 feet of the roll and position it to be rolled across the bottom of the roof, even with the eaves with a 3/8-inch overhang.
• Maneuver into position so it covers the deck right up to the rake but not over the sides of the building. Drive roofing nails into the top corner.
• Pull roll, straighten, and align along the eaves. Ensure there are no wrinkles. Nail at top with roofing nails spaced 8 inches apart. Nail middle and bottom simultaneously with a pattern of nails 24 inches apart.
• Roll out toward the other end of the roof and repeat the nailing pattern.
• Extend over the rake and cut with a utility knife. Trim any that overhangs the rake to complete the first course of underlayment.
• Overlap ends of rolls by 6 inches and drive nails every 4 inches at the overlap.
• Never walk on Typar RoofWrap 30 that is not securely nailed down.

Second course

• Position the next course so it overlaps the first by 4 inches. Use the white lines printed on Typar RoofWrap 30 as a guide for lining up the courses and drive nails every 4 inches at the overlap.
• The bottom of the second course should be on top of the first (lower) course so moisture will flow over the layers.
• Repeat the procedure of laying the first course of Typar RoofWrap 30.
• On slopes of less than 3:12, overlap by 20 inches.

Ridge

• Continue laying in courses over the remainder of the deck.
• Lap top course at least 6 inches over the roof ridge.

Roof covering

Use roof jacks, toe boards or storage platforms secured to the underlying roof deck to prevent slippage of stored roofing materials.
Installation of the roof covering material should immediately follow the underlayment. Typar RoofWrap 30 is not designed for indefinite outdoor exposure. Apply finishing material as soon as possible. Do not leave exposed for more than 6 months.

Drip edge

On homes where eaves and rake are visible from the ground, a drip edge sets off the area where siding and shingles meet. Install drip edge along the eaves after applying adhesive membrane (if installed) but before applying Typar RoofWrap 30. Install along the rakes after applying Typar RoofWrap 30 and under flashings. Shingles typically overhang the drip edge by 1 inch at the eaves and rake.

Chalk lines

Vertical and horizontal chalk lines are needed for the proper application of shingles. Mark lines in English or Metric units depending on the dimensions of the manufactured shingles.

Mansards

Use roofing nails or staples to apply Typar RoofWrap 30 to the deck of a mansard roof. Trim to fit tightly against the window beneath the flashing.

Valleys lined with Typar RoofWrap 30

On some asphalt roofs, shingles are woven across valleys, eliminating the need for flashing. Line valleys with a vertical length of Typar RoofWrap 30 down the center before applying horizontal sections of underlayment. Overlap sections by 20 inches to ensure water will run over the top of the liner. Cut horizontal sections at an angle as the center of the valley is reached and overlap by at least 8 inches. Do not drive nails within 6-inches of the center line.

Valley lined with metal flashings

Valleys require sturdy flashing because they carry more water off a roof than any other roof plane. The most common flashing is aluminum or galvanized metal in 16 to 24-inch widths. The lower the roof pitch, the wider the flashing required. On roofs where metal flashing is used, it is installed after a vertical underlayment liner and before the horizontal underlayment and finish roofing.

Insulation

Proper attic floor insulation lowers the cost of heating in winter and cooling in summer. Heat loss from the structure during cold winter months can also affect the condition of the wooden frame and roofing materials. The movement of heat carries water vapor as it passes through the attic floor and roof. When water vapor comes into contact with the cold attic floor or roof deck sheathing, it condenses and moisture accumulates in cavities between attic floor joists and roof rafters, in the wood deck sheathing, and in the roofing materials. Unless prevented, heat will continue to flow until the temperature between inside and outside is about equal.

Ventilation

Proper attic ventilation lowers the cost of cooling and prolongs the life of roofing materials. Without adequate ventilation, summer weather can superheat attic air and raise the temperature of the living areas below through the ceilings, walls, and joists. Superheated air will scorch rafter boards and sheathing, wilt insulation, and cause shingles to buckle. During winter, when windows and doors are kept closed, an attic must have ventilation to release the water vapor produced by bathtubs, showers, and appliances. Typar RoofWrap 30 must be installed with ventilated attic spaces as it is a vapor barrier.

Chimney, vent and dormer flashings

With chimneys, layers of Typar RoofWrap 30 must be positioned under the flashing at the top, sides, and bottom. Make sure that Typar RoofWrap 30 fits securely under step flashings.

Ice Dams

An ice dam forms when heat from a trapped attic air slowly melts snow on the roof. As the water reaches the roof's edge, it freezes and creates a dam of ice. As the meltwater increases, so does the dam. In time, melted water is forced under the shingles and through the sheathing and can create enough force to lift shingles. However, proper ventilation and insulation will prevent the uneven temperatures that cause ice dams.