Tile Roofing Questions From
Arizona Homeowners

Tile roof underlayment replacement is the process of lifting every tile on your roof, removing the old waterproof underlayment and battens beneath them, inspecting and repairing the wood decking as needed, installing a new underlayment system, and resetting your original tile. The tile is the protective outer layer — the underlayment is the actual waterproof layer. When underlayment ages and fails, which is common on Arizona homes after 15–25 years, replacing it gives your roof decades of renewed protection without replacing tile that still has life left. Monument Roofing offers both a standard 40 lb underlayment system and a premium self-adhered peel-and-stick system with a 50-year manufacturer warranty on the material.

Common signs include water stains on ceilings or walls, damp spots in the attic after rain, recurring leaks around valleys or penetrations, and visible underlayment deterioration when tiles are lifted during inspection. If your tile roof is 15–25 years old with its original underlayment, it may be approaching the end of its service life — even if the tile looks acceptable from the ground. The most reliable way to know is a professional inspection where we lift tiles in key areas and check the underlayment condition directly. We'll show you photos of exactly what we find.

Yes — and this is one of the most common misconceptions about tile roofs. Concrete and clay tiles can last 50 years or more. The tile itself often looks fine from the ground for decades. But the underlayment beneath it — the actual waterproof layer — typically lasts 20–25 years in Arizona conditions, sometimes less. By the time visible tile damage appears, the underlayment has usually been failing for years. This is why we recommend inspections for older roofs even when everything looks okay from the ground.

Yes — in nearly every case. Concrete and clay roof tiles often last 50+ years in Arizona. During underlayment replacement, we lift and number every tile, store it safely during the work, and reset each one in its exact original position. Any broken or damaged tiles discovered during the process are replaced with matching profiles and colors. The finished roof has the same appearance — with a new waterproofing system beneath it. If a significant percentage of your tile is damaged, we'll let you know before work begins, but this is uncommon.

Decking inspection is a standard part of every underlayment replacement. Once the old underlayment is removed, the wood deck is fully exposed. Any sections with water damage, rot, or deterioration are cut out and replaced with new plywood or OSB decking before the new underlayment goes down. We will not install new underlayment over compromised decking. We'll show you photos of what we find and discuss any decking work before we proceed.

The standard system uses 40 lb underlayment with new wood battens. The premium system uses Tri-Built self-adhered high-temperature peel-and-stick underlayment and includes replacement of key penetration and flashing components like pipe jacks and T-top flashing. The premium underlayment is self-adhering, which means it seals around fastener penetrations and reduces potential leak paths. It also carries a 50-year manufacturer warranty on the underlayment material. Both systems include full tile lift, deck inspection and repair as needed, and tile reset. We'll explain both options during the estimate so you can decide which makes sense for your home and budget.

Most residential underlayment replacement projects take 5–10 working days, depending on roof size, pitch, complexity, and how much decking repair is needed. Weather can affect the schedule — we won't work during active rain. We'll give you a clear timeline before we start and keep you updated throughout the project.

The main factors are roof size and complexity, roof pitch, accessibility, which underlayment system you choose (standard or premium), and how much decking repair is needed. A straightforward single-story home with a simple roof layout costs less than a two-story home with steep pitches and multiple valleys. Every project starts with an inspection so we can give you an accurate price based on your specific roof — not a generic estimate.

You should consider scheduling an inspection if: you have an active leak or water stain on a ceiling, you're dealing with a recurring leak on an older tile roof, you're buying or selling a home and want a specialized roof evaluation, your tile roof is 15+ years old with its original underlayment, or you're unsure whether a section repair is enough or whether full underlayment replacement makes more sense. An inspection gives you the facts — not guesswork.

Yes. We lift tiles in strategic locations — typically at valleys, eaves, penetrations, and a sampling of field areas — to check the underlayment directly. Brittle, torn, or deteriorated underlayment is identifiable on inspection. We document what we find with photos. We don't need to remove every tile to assess overall underlayment condition. The tiles we lift are reset after inspection.

Yes — this is one of the primary purposes of our inspection. By checking the underlayment in multiple locations across the roof — not just the area where you saw the interior stain — we can determine whether the problem is limited to one section (making section replacement repair the right approach) or whether underlayment deterioration is occurring across multiple areas (making full underlayment replacement the smarter long-term decision). We'll show you photos from each area we check so you can see the difference for yourself.

The most leak-prone areas on an Arizona tile roof are valleys (where two roof planes meet and channel water), penetrations like pipe jacks and vents, chimney and skylight flashing, and wall-to-roof transitions. These are natural weak points where underlayment and flashing take the most stress. Sun-exposed south-facing slopes also tend to show underlayment deterioration earlier due to more intense heat and UV exposure. During an inspection, we pay close attention to all of these areas.

Yes. After the inspection, we provide a detailed estimate for the work your roof actually needs — whether that's a section replacement repair or full underlayment replacement. The estimate is based on what we found during the inspection, not on a generic price sheet. You'll know exactly what's included, why it's needed, and what it will cost. There's no pressure — just the information you need to make an informed decision.