This site is a general guide to roofing for homeowners, written with Southern Arizona’s desert climate in mind: how a roof system works, the common roof types, what shortens a roof’s life, and how to approach maintenance, repairs and replacement. The articles below cover individual topics. This page explains the basics and points you to more detailed guides across this network.

Clay tile roof against a blue sky

A roof is a system, not just the part you see

When people say “roof,” they usually mean the tile or shingles. That visible layer is only one part of a system that has to work together:

  • Roof deck: the plywood or board sheathing nailed to the rafters or trusses. Everything else is attached to it. See reinforcing roof decks.
  • Underlayment: the waterproof layer on top of the deck. On tile roofs, it’s the real barrier against water.
  • Roof covering: tile, shingle, metal, foam or membrane. It protects the underlayment from sun, wind and impact.
  • Flashing: metal and sealed details at walls, valleys, chimneys, skylights and pipes, where most leaks begin.
  • Ventilation: intake and exhaust vents that let heat and moisture escape the attic. See how ventilation controls moisture.
  • Drainage: gutters, downspouts, scuppers and drains that move water off the roof.

A problem in any one part can cause a leak or shorten the life of the others, which is why good roofers look at the whole system, not just the spot that’s leaking.

Common roof types in Southern Arizona

  • Concrete and clay tile: long-lasting and well suited to sun and heat, but heavy, and dependent on underlayment that wears out sooner than the tile.
  • Asphalt shingle: affordable and easy to repair, but aged faster by desert heat and UV.
  • Metal: light, reflective and low-maintenance, with a higher up-front cost.
  • Spray foam and coatings: common on flat roofs; insulating and seamless, but the coating must be maintained.
  • Membranes and built-up roofing: TPO, EPDM, modified bitumen and multi-layer asphalt systems on low-slope roofs. See waterproof membrane systems for flat roofs.

For a deeper comparison, see the guide to choosing roofing materials.

What wears a roof out in the desert

In wetter climates, roofs fail from moss, ice and constant rain. In the desert, the main enemies are:

  • UV and heat, which dry out asphalt, sealants and coatings and make materials brittle.
  • Daily temperature swings that expand and contract materials, loosening fasteners and opening seams over time.
  • Monsoon storms, with heavy rain, strong winds and occasional hail arriving in a short season. The National Weather Service explains the Arizona monsoon and its hazards.
  • Rooftop equipment, especially swamp coolers and HVAC units, which can leak onto the roof and bring foot traffic.

Reflective surfaces help on both comfort and durability. See solar reflective coatings and energy efficiency and maintenance tips for Southern Arizona roofs.

How long roofs last here

Brochure lifespans assume average conditions, and Southern Arizona isn’t average. As a rough guide to how materials compare in desert conditions:

  • Tile can outlast the house, but the underlayment beneath it usually needs replacing long before the tile does.
  • Metal is among the longest-lasting options and handles heat well.
  • Foam can last for decades if its coating is renewed on schedule. Neglect the coating and it fails much sooner.
  • Asphalt shingles tend to have shorter lives here than their ratings suggest, because heat and UV speed up aging.

Installation quality, attic ventilation, roof color and maintenance all move these numbers as much as the material does. A well-installed, maintained roof of a modest material often outlasts a premium one that was installed poorly.

The life cycle of a roof

Maintenance

Regular care is the cheapest way to make a roof last: clearing debris and drains, checking flashing, replacing cracked tiles or damaged shingles, and recoating foam roofs on schedule. See the roof maintenance guide.

Inspection

An annual inspection, plus one after major storms, finds problems before they reach the ceiling. See the roof inspection guide.

Repair

Most leaks come from a specific failure that can be fixed: a cracked tile, a failed flashing joint, a punctured coating. See the roof repair guide, and for urgent storm damage, the emergency roof repair guide.

Replacement

Eventually repairs stop being worth it, and replacing the roof becomes the better value. See the roof replacement guide.

Features that need extra care

  • Skylights are one of the most common leak sources if they aren’t flashed correctly. See skylight installation.
  • Solar panels add mounts and penetrations that must be flashed and sealed, and the roof under them should have enough life left to outlast the panels.
  • Parapet walls on flat roofs need sound stucco, coping and flashing to keep water from getting in behind the roof.
  • Hail resistance varies by material. See hail-resistant roofing.

Working with a roofing contractor

In Arizona, check any roofer’s license with the Arizona Registrar of Contractors, ask for proof of insurance, get the scope, price and warranty in writing, and ask to see photos of the problem. For more, see the guide to choosing a roofing company in Tucson and the guide to what affects roofing costs. The National Roofing Contractors Association is the industry’s main trade group.

New to the topic? Start with the complete roofing guide. The newest articles on this site are listed below.

Category: Roofing