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Roof Structure

Think "integration"
A roof is much more than just shingles. When you replace your roof, be aware that it is a system of integrated parts: shingles, felt or shingle underlayment, ventilation and insulation. Working in unison, these elements can provide maximum performance and efficiency. Shingles by themselves may look nice, but without considering the whole package, you could be looking at major roof or attic problems down the road. With a full line of shingles, WinterGuard™ waterproofing underlayment, ridge vents, vented soffits and fiber glass insulation, the Defrehn Corporation can help you defend your home against the effects of sun, wind, snow, rain and ice.

Basic structure
Most house roofs are gable roofs, consisting of two planes that meet at a central peak and slope down to the building's long walls. The triangular sections on the ends are the gables. The hip roof is similar to the gable roof except that all four sides are sloped. A flat roof generally overhangs the outside walls of the house. On most homes, the various types of roofs are used in combination. The major parts of this roof are the: (1) Ridge; (2) Gable; (3) Dormer; (4) Roof deck; (5) Rake; (6) Eave; and (7) Valley

Flashing
The key to waterproofing your home's roof is flashing. Wherever there is a joint (between roof sections, around a chimney or roof vent), special care must be taken to keep water out. Joints are vulnerable because the two sides may expand and contract at different rates or pull apart as a house settles. Copper, galvanized steel and aluminum are the most common materials used for flashing.

Flashing, if installed correctly, directs streams of water from these points of entry: (1) Skylights; (2) Chimneys; (3) Vents; (4) Valleys; (5) Eaves; (6) Rakes.

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