- Proudly Serving Los Angeles County, CA
- (310) 919-7587
Sometimes the tiles on your roof are still in good shape, but the layer underneath has quietly worn out. That hidden layer is the underlayment, and it is what actually keeps water out. When it fails, the fix is not a whole new roof. It is an underlayment replacement. LA Roof Kings is a family owned company serving Los Angeles County for more than 20 years, licensed under California Contractor License #600662. We replace worn underlayment, reuse the tiles you already have, and save you the cost of a full reroof. Call us at (310) 919-7587 for a free inspection.
Underlayment is the waterproof layer that sits between your roof deck and your tiles. The tiles take the sun and shed most of the rain, but they are not watertight on their own. Water that blows under or between them is stopped by the underlayment. On a tile roof, this is the part doing the real waterproofing.
Here is the catch. Tiles can last 50 years or more, but underlayment typically lasts only 20 to 30 years. So on most older tile roofs in Los Angeles, the tiles are fine while the underlayment beneath them has already given out. That mismatch is the single most common reason a tile roof starts leaking even though it looks perfectly good from the street.
Because the damage is hidden under the tiles, the warning signs show up indoors or as small clues on the roof:
If any of these sound familiar, the only way to confirm it is to look under the tiles. That is what our free Roof Inspection is for. We check the underlayment, the decking, and the flashing, then tell you honestly what is going on.
The underlayment is your home’s second line of defense against water. Rain that slips past or between the tiles lands on this layer instead of your ceiling. When it breaks down, even small gaps between tiles let moisture reach the wood framing and insulation underneath, and that is where the real damage starts.
Los Angeles is tile country. Drive through almost any neighborhood and you will see clay and concrete tile roofs everywhere, many of them decades old. The tiles were built to last and usually have. The underlayment is another story. Year round UV exposure and heat dry out and crack older felt long before its time, even while the tiles above it look untouched. Add the Santa Ana winds that drive rain sideways under the tiles, and you have the exact conditions that wear underlayment out faster here than in milder climates. That is why this is one of the most common tile roof services we do across the county.
Replacing worn underlayment on time protects you in a few concrete ways:
Most underlayment replacements on a typical Los Angeles home take about 2 to 3 days, depending on the size and complexity of the roof. The sooner you act after spotting water stains or slipped tiles, the less likely you are to face structural damage.
1. Inspection and assessment. We get on the roof, lift a few tiles, and check the real condition of the underlayment and decking. This tells us the scope and cost before any work begins, and whether you truly need underlayment replacement or something else.
2. Careful tile removal. We lift your existing tiles and stack them safely so they can go back on, working systematically to keep debris down and protect your landscaping and anything around the house. Most tiles survive intact. Solar panels, if you have them, have to come off first to reach the underlayment, which we take care of as part of the job.
3. Deck inspection and repair. With the tiles off, we can see the full condition of the roof deck. We replace any rotted or soft plywood or OSB sheathing before going further, because damaged decking only gets worse if it is left in place.
4. New underlayment. We install fresh underlayment that meets current building codes, with proper overlap and the correct fastening pattern, sealed around vents, valleys, and flashing to form one continuous moisture barrier.
5. Tile reset and seal. We reinstall your original tiles, replace the small percentage that broke during removal with matching ones, and make sure the flashing is set correctly so water cannot bypass the new layer.
6. Final check, cleanup, and warranty. We do a final walkthrough, clear the site, sweep for nails, give you documentation of the work, and back it all with a written warranty.
This is the question most homeowners really want answered, because it is the difference of thousands of dollars. The honest test is simple. If the tiles are still in good condition and only the underlayment has failed, an underlayment replacement is the smarter, far cheaper choice. You reuse the tiles, which are the most expensive part of the roof, and pay mainly for the new underlayment and the labor to remove and reset the tiles.
If the tiles themselves are widely cracked or the decking is badly damaged, then a full Roof Replacement may make more sense. We will never push you toward a new roof you do not need. After the inspection, we give you honest numbers for both so you can decide. Homes with solar are covered too. We coordinate the solar panel removal and reinstall so the panels come off, the new underlayment goes in, and they go back on without you hiring a separate crew. If the issue turns out to be a single leak rather than a worn out layer, our Roof Leak Repair service handles that instead, and for general fixes see Roof Repair.
The underlayment you choose affects how long you go before needing this again. Felt is the budget option, while synthetic and rubberized underlayment cost a bit more and hold up far better under LA heat and sun. For most tile roofing here, we recommend a quality synthetic so the new layer lasts as long as possible. We work with trusted materials from Owens Corning, CertainTeed, GAF, Malarkey, and Polyglass, and we will walk you through the trade offs honestly before you decide.
We look at your roof and give you an honest assessment before you spend a dollar.
We know how LA roofs age and what actually holds up in this climate.
The name on the truck is the name on the license, and that shows in how we treat every job.
California Contractor License #600662.
We replace underlayment on tile roofs across Los Angeles County, from the San Fernando Valley to the South Bay and out to the San Gabriel Valley. You can see all the communities we cover on our Service Areas page. If your property is in Orange County, our sister company OC Roof Kings handles the same work there to the same standards.
For a typical tile roof in Los Angeles, underlayment replacement often runs about $4 to $7 per square foot installed, which for many homes works out to roughly $7,000 to $15,000. The range is wide because cost depends on roof size, pitch, how complex the roof is, how many tiles break during removal, and whether the decking underneath needs repair. Felt is cheaper than synthetic, but synthetic lasts longer in our climate. These figures are general estimates based on typical roofing data, not a quote. The only accurate number for your roof comes from an actual inspection, which we do for free.
Most roof underlayment lasts about 20 to 30 years, while the tiles on top can last 50 years or more. That gap is the whole reason underlayment replacement exists. In Los Angeles, strong year round UV and heat can push older felt toward the shorter end of that range, which is why so many tile roofs here need the underlayment replaced at least once long before the tiles wear out.
Yes. The underlayment sits directly under the tiles, so the tiles have to come off to reach it. We lift and stack your existing tiles, replace the underlayment underneath, then reset the same tiles back into place. Most tiles survive this fine, but expect roughly 10 percent to crack or break during removal, especially on older roofs. We replace those with matching tiles as part of the job.
The clearest sign is a leak that shows up on the first real rain after a long dry stretch, often as a ceiling stain even though the tiles look fine from the ground. Other signs include slipped or cracked tiles, damp insulation in the attic, and felt that is brittle or crumbling when a roofer checks it. Since the failure is hidden under the tiles, a roof inspection is the only way to confirm it.
Usually, yes, and often by a wide margin. The tiles are the most expensive part of a tile roof, and in an underlayment replacement you reuse them rather than buy new. You pay for the new underlayment, the labor to remove and reset the tiles, and any broken tiles, but not a full set of new material. When the tiles are still in good shape and only the layer beneath has failed, this is the smarter and far cheaper fix.
If your tile roof is leaking but the tiles still look good, the underlayment is the likely culprit, and you may not need a full new roof at all. Call (310) 919-7587 or request a free inspection, and we will tell you straight what your roof needs and what it will cost.
