Age alone does not decide it. Here are the signs that actually mean a roof is finished, the eight things a quote has to specify, and the warranty distinction that catches most homeowners out.
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Age alone does not decide it. A Houston roof takes more ultraviolet and more heat cycling than the same roof in a milder climate, so a shingle rated for twenty-five years often gives fifteen to twenty here. But the signs matter more than the number.
Three or more of those, and you are replacing rather than repairing. One or two, and a good contractor should be telling you a repair will hold. A contractor who recommends full replacement for a single leak is worth a second opinion.
| Line | Why it matters |
|---|---|
| Tear-off, and how many layers | Disposal of two layers costs meaningfully more than one. If it is not specified you may be quoted for one and billed for two |
| Decking replacement allowance | Nobody knows how much rotten decking is under there until the old roof comes off. The quote should state a per-sheet price rather than leave it open |
| Underlayment type | Synthetic versus felt is a real difference in a climate with wind-driven rain |
| Ice and water shield in the valleys | Valleys carry the most water on the roof. This is where skimping shows up first |
| All new flashing | Reusing old flashing is the most common corner cut, and flashing is the leading cause of leaks |
| Ventilation | Ridge vent, soffit intake. Poor ventilation cooks shingles from beneath and shortens the roof's life |
| Permit | Replacement requires one. A contractor skipping it is skipping inspection |
| Warranty, split | Manufacturer warranty covers the shingle. Labour warranty is the contractor's own promise and is the one that matters |
This is where homeowners get caught. A shingle manufacturer's thirty-year warranty covers manufacturing defects in the shingle. It does not cover installation, and the overwhelming majority of roof failures are installation, not product.
The labour warranty is what protects you, it comes from the contractor, and it is worth exactly what that contractor is worth in five years. Ask how long they have been trading under that name at that address.
If the choice is yours, replace outside storm season and outside the weeks immediately after a major hail event. Prices rise, crews are booked, and the out-of-state operators arrive.
Heat is a genuine constraint too. Shingles are installed with a self-sealing strip that needs warmth to bond, which Houston has plenty of — but extreme heat makes shingles soft enough to scuff under foot traffic. Spring and autumn are the comfortable windows for quality of work as well as for scheduling.
Covered on the roof replacement cost page, including how quotes are structured and why two for the same roof come in hundreds apart.Call 832-662-4107