A clay or concrete roof tile can remain hard and serviceable after the material beneath it has started letting water into the house. That distinction matters on an older Ladue home. A cracked tile may be the visible problem, but replacing that one piece will not stop a leak caused by worn underlayment, failed flashing, or deteriorated wood below the tile. Before approving a repair, find out whether the contractor is addressing one broken unit or the water shedding system under the entire field.
Town roofing
Tile is only the exposed surface of the assembly. Beneath it should be an underlayment over the roof deck, with flashing at walls, chimneys, valleys, vents, skylights, and changes in slope. Depending on the roof, the tiles may be hung from battens, fastened directly, or secured through another approved method. Water that passes between the tiles is supposed to drain safely over the layer below.
That hidden drainage plane is why a roof can leak even when the tiles still look substantial from the yard. Underlayment becomes brittle with age and heat. Fastener holes enlarge. Metal at a valley can corrode or separate at a joint. Flashing can pull away from masonry as the house and roof move at different rates. A repair made only from the exterior may cover the symptom without correcting the path that water follows.
Ladue houses often have several roof sections rather than one uninterrupted plane. A steep tile field may meet a lower porch roof, a rear addition, a chimney, a dormer, or a wall clad in brick or stone. Each transition needs its own detail. The lower section may require a membrane or another material rather than the tile treatment used above it. The written scope should identify those transitions separately.
St. Louis weather adds stress to weak details. Water enters a small opening, freezes, expands, and opens it further. Repeated freeze and thaw cycles can loosen mortar, move flashing, and split tiles that already contain a hairline crack. Ice damming at an eave can push water beneath a system that normally drains correctly. Spring hail can fracture individual tiles without producing an obvious missing piece. None of those conditions proves that every tile must be removed, but each is a reason to inspect more than the spot directly above an interior stain.
Walking the roof also requires care. Tile can break under a poorly placed foot, especially when it is cold or when an older tile has become brittle. A contractor should explain how the roof will be accessed, where workers can step, and how accidental breakage will be handled. An inspection that creates several new cracked tiles is not a useful inspection.
Start with the leak path
An interior stain rarely identifies the exterior opening by itself. Water can enter at a wall, travel along the deck or a rafter, and appear several feet away. The inspection should begin inside when access is available. Damp decking, darkened framing, rusted fasteners, compressed insulation, and repeated staining can help distinguish a current path from an old mark.
Outside, the contractor should examine the tiles and the details around them. Useful photographs include cracked or displaced tiles, valley edges, apron and step flashing, pipe penetrations, mortar joints, previous sealant repairs, and the lower edge where drainage leaves the assembly. A photograph of an intact tile field does not show the condition of the underlayment.
A limited test opening can sometimes answer the central question. Removing a small number of tiles allows the contractor to inspect the underlayment, battens, fasteners, flashing laps, and deck. The scope should state who is responsible if surrounding tiles break during that work and whether compatible replacement pieces are available.
Repair, lift and relay, or change the assembly
A localized repair can make sense when the surrounding underlayment remains flexible and intact, the deck is sound, and the failure is confined to a specific penetration or a few damaged tiles. The repair should still extend far enough to rebuild the flashing or underlayment lap correctly. Smearing sealant over the exposed joint is maintenance, not a durable reconstruction of the detail.
A lift and relay is different. Workers remove the existing tile carefully, store the reusable pieces, replace the underlayment and necessary flashing, repair the deck, and reinstall the tile. New pieces are added where the originals are cracked, missing, or unsuitable for reuse. This approach may preserve the appearance of an established roof while renewing the hidden water control layer.
The word reuse needs a number beside it. A proposal should not assume that every tile will survive removal. Ask for an estimated salvage percentage, the source and price of supplemental tile, and the method for blending replacement pieces into visible slopes. The estimate may change after removal, but the pricing method should be settled before work begins.
Full replacement with a different material may be reasonable when too few tiles can be reused, compatible pieces are unavailable, the supporting structure needs substantial work, or the owner no longer wants to maintain the tile system. If asphalt shingles are being considered, the proposal should identify the specific Atlas or Malarkey product, the underlayment, the flashing work, the ventilation plan, and the treatment of roof sections that are too low for shingles.
Do not assume that a lighter replacement can be installed without design questions, or that the weight of tile is automatically a defect. The existing framing, deck, tile type, and proposed assembly should be evaluated as they actually exist. If structural deterioration or an unusual framing condition appears, the right next step may be an engineer rather than an improvised field decision.
What it costs
Tile work is priced differently from an ordinary shingle repair because access and handling take more time. A crew may need to move dozens of sound tiles to reach a small failed area without damaging the pieces around it. Steep slopes, high eaves, narrow side yards, landscaping, stone terraces, and limited equipment access can all affect labor and protection costs.
For a repair, ask the contractor to separate the investigation from the reconstruction. The proposal should state how many tiles may be removed, what flashing or underlayment will be replaced, how deck repairs are charged, and what happens if the opening reveals a broader failure. Without those terms, a small quoted repair can become an open ended job after the roof is exposed.
For a lift and relay, compare quantities rather than one total number. The useful figures include roof area, estimated reusable tile, allowance for replacement tile, underlayment type, linear feet of valley, wall and chimney flashing, deck replacement rate, disposal, access equipment, and temporary weather protection. Two bids can describe the same roof yet include very different amounts of tile replacement and metal work.
Municipal requirements also belong in the price discussion. Permit administration varies among the municipal desks across St. Louis County. The contractor should confirm which authority covers the Ladue address, whether the proposed scope requires a permit, who will obtain it, and whether an inspection must occur before concealed work is covered. That answer should be tied to the address and scope, not treated as a general county rule.
Age changes the repair calculation. On an old three tab shingle roof, repeated spot repairs often stop making financial sense once the shingles are brittle, poorly sealed, and difficult to disturb without breaking adjacent tabs. Tile requires a different analysis. The exposed units may still be reusable even when the underlayment is at the end of its serviceable life. A roof should not be condemned merely because one hidden layer needs renewal, but the cost of reaching that layer must be included honestly.
What to ask
Ask for answers that describe the assembly, not just its appearance. These questions will usually expose whether the proposed work addresses the leak or merely covers the visible symptom:
- What evidence shows that the failure is limited to one area?
- Will any tile be removed so the underlayment and deck can be inspected?
- How will removed tiles be stored and protected during the work?
- What percentage of the existing tile is expected to be reusable?
- Where will compatible replacement tile come from, and how will it be priced?
- Which valleys, walls, chimneys, vents, and slope changes are included?
- What underlayment will be installed, and how will it drain at the eave?
- How will rotten or delaminated decking be measured and charged?
- How will the roof be protected if rain arrives while tile is off?
- Who confirms the permit requirement for this Ladue address?
Also ask what will be photographed. At minimum, you should receive images of the roof before opening, the exposed underlayment and deck, completed flashing before it is covered, and the finished surface. Those photographs give you a record of work that will otherwise disappear beneath the tile.
If the contractor cannot identify the source without opening part of the roof, that can be a responsible answer. The next step should be a defined diagnostic scope with a price, an opening limit, and a plan for making the roof watertight again. It should not be an unlimited authorization to remove material until someone finds something.
Keys Roofing can inspect the roof, document visible conditions, and put the proposed repair or replacement assembly in writing. To discuss a tile roof at a Ladue property, call (314) 220-2333. Have the leak location, approximate roof age, any prior repair records, and interior photographs available when you call.