A Careful, Material-First Method for Drilling Ceramic Tile

Ray Kowalski August 16, 2026 · 22 min read

A careful, material-first method for drilling ceramic tile

Drilling ceramic tile is a tool-matching and control problem. The aim is to penetrate the hard, brittle glazed face without shock, excessive heat, or sideways loading—not to overpower it.

The dependable sequence is to identify the tile and wall assembly, choose a tile-rated bit for the required hole diameter, stabilize the start, switch off hammer action, and drill slowly with light pressure. Manage heat exactly as the bit manufacturer directs. Reduce pressure near breakthrough, stop after penetrating the tile, and treat the substrate and anchor as a separate stage.

These practices reduce the chance of cracks and chips, but they cannot guarantee a damage-free hole. Existing damage, weak bonding, unsupported areas, tile hardness, bit condition, concealed materials, and operator technique can all affect the result.

The short answer: the safest general method

For a typical small fastener hole in standard ceramic tile:

Confirm, as far as possible, that the tile is ceramic rather than porcelain, glass, or natural stone.
Choose a correctly sized tungsten-carbide ceramic or glass bit, often a spear-point design.
Confirm the finished hole diameter, likely backing material, anchor requirements, and fixture position.
Clean the tile and stabilize the start with compatible painter’s tape, a drill guide, or both.
Set a variable-speed drill to normal rotary mode. Switch hammer or percussion action off.
Start at the lowest practical speed with light, steady pressure.
Control heat and debris using the wet- or dry-drilling procedure specified for the exact bit.
Maintain alignment. Do not lean sideways or force the drill.
Reduce pressure as the bit approaches the back of the tile.
Stop once the tile layer has been penetrated.
Identify the backing, change to the appropriate substrate bit, and use an anchor specified for that substrate and fixture.

The job has three physically distinct stages:

The glazed face: hard and smooth, so an unsupported bit may skate.
The ceramic body: generally easier to penetrate after the glaze has been breached.
The substrate: potentially drywall, cement board, wood, brick, concrete, or a layered assembly requiring different tooling and fastening decisions.

For larger pipe, valve, or cable openings, a diamond hole saw or core bit is commonly used. Denser porcelain and natural stone also generally call for diamond tooling rather than the standard ceramic workflow. Tivoly distinguishes less-dense ceramic from porcelain and recommends a tungsten-carbide bit designed for ceramic or glass for ordinary ceramic holes, with diamond tooling for denser materials and larger openings (see Tivoly’s material guide).

Tile material	Approximate hole category	Typical bit design	Drill mode	Cooling instruction
Confirmed standard ceramic	Small fastener hole	Tile-rated tungsten-carbide ceramic or glass bit, often spear-shaped	Rotary only; hammer off	Follow the bit’s wet- or dry-use instructions
Porcelain or hard stone	Small hole	Diamond-coated bit rated for the material	Rotary only while penetrating tile; use the non-impact method specified for the bit	Use only the specified wet or dry method
Ceramic, porcelain, or stone	Large circular opening	Diamond hole saw or core bit sized for the fitting	Rotary, using a compatible tool and arbor	Follow the hole saw’s cooling and debris-clearance procedure
Material uncertain	Any hole	Use tooling expressly rated for the hardest plausible material, test a matching spare if available, or seek specialist identification	Tool-specific, without impact in the tile	Manufacturer-specific
Loose ceramic tile	Small or large hole	Material-appropriate tile bit, with full support beneath the tile	Rotary only	Bit-specific, with runoff or debris controlled

There is no single correct RPM, cooling method, or starting technique for every product. Wet diamond cores, dry diamond bits, pointed carbide bits, and centerless hole saws can have different requirements. Topps Tiles, for example, describes distinct wet- and dry-diamond systems, including products intended for different tools and operating speeds (compare its wet- and dry-bit guidance).

Confirm the material, hole size, and wall assembly before choosing a bit

Standard ceramic is generally less dense and easier to drill than porcelain. That distinction matters because a carbide ceramic bit that works on ordinary wall tile may skate, overheat, or wear rapidly on a harder material.

Do not rely on surface appearance alone. Installed glazed ceramic and porcelain can look similar when their edges and backs are hidden. Check:

Original packaging
Purchase invoices
Spare tiles
Product numbers
Builder or installer records
Manufacturer documentation

If the material remains uncertain, do not assume that a glossy wall tile must be standard ceramic. Use a bit expressly rated for the hardest plausible material, test on a matching spare tile if one is available, or stop and seek specialist identification when failure would have serious consequences.

Next, define the completed hole. A small fastener hole is not the same operation as a pipe-size opening. Record the finished diameter required by the fitting or anchor—not merely the visible diameter of the screw shank. An anchor may require a different hole diameter, while a pipe, sleeve, or escutcheon may need additional clearance.

Then establish what lies behind the tile as far as the available records and inspection allow. Possibilities include:

Drywall or plasterboard
Cement backer board
Wood sheathing or framing
Brick
Concrete
Adhesive, membranes, cavities, or multiple layers

Do not assume that the tile bit should continue through every layer. After penetrating the tile, stop and select the follow-up bit according to the actual substrate.

Fixture load belongs in this planning stage. A neat hole proves only that the tile was penetrated; it does not establish that the wall assembly or anchor can support a shelf, cabinet, grab bar, television mount, or other fixture. Follow the fastener and fixture documentation. If suitable support cannot be confirmed, obtain qualified advice before drilling.

Inspect the tile closely. Stop if you find an existing crack, movement, a loose tile, or an unsupported loose workpiece. Locations near edges and corners are also more vulnerable, so move the hole inward when the fixture layout permits. No single edge-clearance measurement applies to every tile size, thickness, and installation.

Use this worksheet before buying a bit or touching the drill:

Planning item	What to establish
Tile type	Ceramic, porcelain, stone, glass, or uncertain
Finished hole diameter	Dimension required by the fitting or anchor
Bit documentation	Compatible material, tool, speed, starting technique, wet/dry rating, and cooling method
Backing material	Drywall, cement board, wood, brick, concrete, layered assembly, or unknown
Anchor documentation	Required hole diameter and depth, compatible substrate, and installation procedure
Fixture requirements	Intended use and any specified mounting support
Wet-area status	Whether the hole may affect a shower, bath, backsplash, or similar assembly
Concealed services	Possible wiring, plumbing, heating elements, or controls
Tile condition	Sound, firmly bonded, undamaged, and adequately supported

Tile Mountain likewise emphasizes identifying the tile, checking for concealed plumbing and wiring, controlling depth, and considering wet-area sealing. Its numerical speed and depth suggestions should not be treated as universal specifications (review its planning considerations).

Choose the drill, bit, guide, and protective equipment

Use a variable-speed drill that can operate in ordinary rotary mode. If it has a hammer, percussion, or impact-drilling setting, disable that action while the bit is penetrating or bearing against the tile.

For a typical small hole in confirmed standard ceramic, use a purpose-made tungsten-carbide-tipped ceramic or glass bit, often identified by a spear-shaped cutting head. Choose its diameter from the fitting or anchor instructions.

Advice about ordinary masonry bits is inconsistent. Some guides accept certain carbide-tipped masonry bits for softer ceramic, while others advise against ordinary masonry bits on the tile face. The designs and intended cutting actions vary, so the practical resolution is to buy a bit expressly labeled for the tile material and drilling method rather than assuming every masonry bit is suitable.

Use appropriately rated diamond tooling for hard porcelain, natural stone, uncertain tile, or an opening too large for a spear-point bit. A diamond hole saw or core bit is the usual category for a larger circular opening. Confirm that the product is compatible with your drill, arbor, material, and intended wet- or dry-drilling method.

Do not transfer instructions between superficially similar tools. A high-speed diamond bit made for an angle grinder is not automatically suitable for an electric drill. Product-specific speed and cooling requirements control. For broader context on matching types of drill bits to different materials, review the distinctions before selecting the tile and substrate bits.

A practical equipment list includes:

Variable-speed rotary drill
Correctly sized tile-rated bit
Appropriate substrate bit for the second stage
Painter’s tape compatible with the tile finish
Marker or grease pencil
Tape measure, square, or suitable level
Fixture template
Compatible drill guide, hole-saw guide, or wooden template
Depth stop or visible tape marker
Eye protection
The bit-approved cooling, suppression, or debris-collection arrangement
Drop cloths and cleanup materials

A guide is especially useful for a centerless diamond hole saw because it has no pilot point to prevent wandering. A compatible suction guide, commercial template, or firmly held wooden guide is more controllable than attempting to establish the cut freehand.

Wear eye protection and plan debris control before drilling. Tile and cement-based backing can produce fine mineral dust, but the supplied evidence does not establish one universal respiratory-protection or collection method. Use the suppression or collection procedure approved for the bit and material, and consult applicable safety guidance or a qualified professional when potentially hazardous dust cannot be adequately controlled.

Never use a hand or gloved fingers to steady a rotating bit. Keep hands clear of the chuck, bit, and hole saw, and stop the tool before repositioning a guide or clearing debris.

Before drilling, read the exact bit instructions and confirm:

Permitted tool type and arbor
Maximum or recommended speed
Wet-only, dry-only, or dual-use rating
Required cooling method
Starting technique
Recommended movement, if any
Hole-depth and debris-clearance procedure

Apollo Tile’s equipment overview similarly identifies a tile-specific bit, eye protection, low-speed drilling, and a guide as relevant preparation measures, although the exact protective arrangements must still suit the tool and task (see its equipment overview).

Prepare the location and control the hazards behind the tile

Measure from fixed references rather than relying on visual judgment. For fixtures with two or more mounting holes, use the supplied template when available and verify spacing with an appropriate level. Hold the actual fixture in position before drilling if doing so does not obscure the marks.

Investigate the proposed location for concealed wiring and plumbing using available drawings, service records, appropriate detection equipment, and knowledge of the building assembly. Tapping on tile is not a reliable way to identify a pipe, cable, stud, void, or backing material.

A detector may help, but it does not establish every hidden condition. Obtain installation photographs, invoices, drawings, or installer records where possible. If the hole may affect an unknown concealed system, stop and consult an appropriate trade professional.

Keep the proposed center away from tile edges and corners when the fixture layout allows. Also consider whether relocating the fixture could avoid a concealed hazard or place the mounting point over documented support.

Once the location is accepted:

Clean the tile face without leaving oily residue.
Dry the work area.
Apply painter’s tape over the drilling point if it is compatible with the finish.
Mark the exact center on the tape.
Position a compatible drill guide or template if needed.
Set a depth marker from the documented fastener requirement and known wall construction.
Protect nearby surfaces and arrange collection for water or debris.

If the bit requires water, use only the method permitted by the bit and tool manufacturers. The available tile guides do not provide complete electrical-safety instructions for every drill and worksite, so do not improvise a wet setup around electrical connections or uncontrolled runoff. If the approved operating conditions cannot be maintained, use a compatible dry-rated system or obtain qualified help.

For dry drilling, follow the bit maker’s specified pauses, movement, and debris-clearance method. Do not assume that a wet bit can be used dry, that a dry bit may run continuously, or that any convenient vacuum is suitable for every kind of dust.

Stop before drilling if:

Wiring, plumbing, or another service may cross the hole.
Waterproofing, heating, or another concealed system is present but undocumented.
The tile is cracked, loose, or moving.
The required mounting support cannot be confirmed.
The anchor and finished hole dimensions are unknown.
The specified cooling method cannot be used safely.
Dust or debris cannot be adequately managed.
Tile material or bit compatibility remains too uncertain to proceed.

Drill the installed ceramic tile in three controlled stages

Stage 1: Establish the cut in the glaze

Confirm that the drill is in rotary-only mode. Seat the bit securely in the chuck, remove the chuck key if applicable, and verify that the bit runs true.

Adopt a stable stance. Hold the drill with both hands, align it with the planned hole, and start at the lowest practical speed. Apply only enough steady pressure for the cutting surface to engage. Do not jab the bit into the glaze, strike the mark with a nail or center punch, or add force simply because progress is initially slow.

Starting technique depends on bit design:

Pointed carbide ceramic bit: Use tape, a compatible guide, or both. Follow the bit instructions for alignment and starting position.
Centerless diamond hole saw: Prefer a template or guide. Use an angled start only when the product manufacturer expressly permits it.
Pilot-guided system: Follow the requirements for the supplied pilot and guide assembly.

Published guidance differs between square and angled starts because it addresses different bit designs. Do not apply an arbitrary angle to every bit.

Stage 2: Drill through the ceramic body

Once the bit has established a stable recess, keep the drill controlled and generally perpendicular unless the bit instructions specify another motion. Let the cutting surface work.

Avoid:

Leaning the drill sideways
Rocking a pointed carbide bit
Pushing hard to accelerate progress
Increasing speed aggressively after breaching the glaze
Allowing the chuck or guide to strike the tile
Continuing despite obvious heat buildup

Resistance may decrease after the glaze has been penetrated. That change does not justify switching on hammer action or forcing the bit.

Manage heat and debris according to the bit instructions. If wet cooling is approved, use the specified controlled method. If the bit is dry-rated, follow its required pauses, movement, or debris-clearance procedure. Topps Tiles’ guidance illustrates why this distinction matters: some dry diamond products use internal wax or specified movement, while wet systems rely on water delivery.

Pause when necessary to:

Check for overheating
Clear debris with the tool stopped
Confirm that the guide has not moved
Inspect the developing hole
Reassess unexpected resistance

Do not use a generic drilling-time estimate as a performance target. Progress varies with tile hardness, thickness, bit diameter, bit condition, cooling, alignment, and the material behind the tile.

The recurring general method is low-speed rotary drilling with light pressure, followed by reduced pressure near breakthrough (see Zhonghuan Tools’ material-specific workflow).

Stage 3: Approach breakthrough

As the bit nears the back of the tile, reduce pressure. This limits the force applied to the remaining material and reduces the chance of a sudden plunge into an unknown substrate or cavity.

Stop as soon as the tile layer has been penetrated. Withdraw the bit while maintaining alignment rather than levering it against the hole edge. Stop and isolate the tool according to its instructions before touching the bit, changing tooling, or clearing compacted material.

Inspect the hole for:

Radiating cracks
Loose glaze
Excessive chipping
An unexpectedly large diameter
Tile movement
Visible backing material
An unexpected membrane, obstruction, or cavity

Do not continue until the substrate has been identified and the correct follow-up bit and depth have been established.

1. ALIGN AND START        2. CUT WITH CONTROL       3. EASE AT BREAKTHROUGH
       drill                     drill                       drill
         │                         │                           │
         ▼                         ▼                           ▼
   [guide/tape]             approved cooling            lighter pressure
   ══ glazed face ══        ══ glazed face ══          ═══ tile ═══
   ▒ ceramic body ▒         ▒ established hole ▒       ▒     ○     ▒
   █ backing unknown █      █ backing unknown █        █ substrate █
                                                        STOP—change bit

The sequence shows four controls: stable alignment, bit-approved heat management, reduced breakthrough pressure, and a deliberate stop before the substrate stage.

Adapt the method for a large opening or a loose tile

A pipe, valve, conduit, or cable opening normally requires a diamond hole saw or core bit sized for the fitting and rated for the tile material. Confirm whether the stated diameter is the actual cutting diameter and whether the installation needs clearance for a sleeve, sealant, movement, or an escutcheon.

Centerless diamond hole saws can wander across glazed tile. For a beginner, use a compatible suction guide, commercial template, or wooden guide secured so it cannot move across the finished surface. Test the guide fit with the tool switched off.

Some product instructions permit an angled start to establish one edge of a centerless hole saw before bringing it upright. Others favor a guide and square start. Treat the technique as product-specific. If the documentation does not authorize a freehand angled start, use a guide.

For an uninstalled tile:

Place the tile face-up.
Support it fully on a flat, stable, rigid sacrificial backing board.
Remove debris beneath it that could create a pressure point.
Prevent the tile and backing from moving without concentrating clamp pressure on the tile.
Mark and guide the hole as for installed tile.
Drill using the bit-specific speed and cooling procedure.
Reduce pressure near breakthrough.

Do not hold a loose tile in your hand or drill it unsupported in midair. Tivoly’s guidance calls for stable, rigid support beneath an uninstalled tile and identifies diamond hole saws for larger diameters.

Completing part of the hole from each side is not a default beginner method.

Wet and dry diamond systems are not interchangeable. A wet core may require controlled water delivery, while a dry-rated product may depend on pauses, air exposure, internal wax, or specified movement. Never transfer an angle-grinder operating speed to a drill-mounted bit merely because both tools use diamond cutting surfaces.

Tool-compatibility warning: The permitted tool, arbor, speed, wet-or-dry method, cooling procedure, and maximum RPM come from the exact bit packaging or manufacturer. A generic online RPM is not a substitute.

Change bits for the backing, then anchor and finish the installation

After breaking through the tile, stop. Remove loose debris and identify the substrate rather than continuing blindly with the tile bit.

Drywall, cement board, wood, brick, and concrete do not use one universal follow-up bit or anchor. Select the second bit and fastener from the documented substrate and installation requirements. Ensure that the bit creates the diameter required by the anchor.

Hammer mode remains off while any part of the active bit is cutting or bearing against the tile. If hammer action is appropriate later for a masonry substrate, use it only after the active cutting section has cleared the tile and only when the drill, bit, substrate, and product instructions permit it.

Control depth from the selected fastener instructions and known wall construction. There is no universal depth beyond the tile that suits every anchor, substrate, or concealed-service layout.

When the substrate hole is complete:

Stop the drill and withdraw it without levering against the tile.
Clean debris using a method appropriate for the fastener and material.
Inspect the tile for cracks, movement, or spreading chips.
Check the finished diameter and depth against the anchor instructions.
Install the specified anchor without forcing an oversized component through the tile.
Position the fixture and start all fasteners before final tightening.
Tighten gradually and evenly.

Do not overtighten. Tile is brittle, and a screw head, washer, bracket, or fixture base can concentrate pressure around the hole. Tighten only as required to secure the fixture under its instructions.

Anchor selection must account for the actual substrate, finished hole, fixture, and fastener documentation. If the wall assembly’s suitability cannot be confirmed, relocate the mounting point or obtain a qualified assessment rather than improvising a load-bearing fixing.

In a wet area, the penetration may require a system-specific sealing detail. The supplied evidence does not support one universal method for repairing or sealing every waterproofed assembly. Follow the waterproofing, sealant, fixture, and fastener documentation, or consult the original installer.

Contractors Direct similarly separates tile penetration from anchor installation and advises cleaning the hole and matching its diameter to the selected anchor (see its drilling and anchoring sequence).

After installation, check for:

New or expanding cracks
Tile movement
Loose fasteners
Fixture movement during normal use
Uneven pressure against the tile
Gaps where system-specific sealing is required
An anchor that rotates or pulls out

Stop using it and reassess the anchor, substrate, and support.

Troubleshooting, common mistakes, and reasons to stop

Symptom	Likely cause	Immediate action	Continue?
Bit skates across the glaze	Wrong bit, unstable start, damaged tape, missing guide, or excessive initial speed	Stop, inspect the bit, renew the tape, and fit a compatible guide	Only after stabilizing the start
Rapid heat buildup or discoloration	Excessive speed or pressure, unsuitable bit, inadequate approved cooling, or worn cutting surface	Stop and use the manufacturer-approved cooling procedure; check the bit rating	Only if the bit is undamaged and the method is corrected
Smoke or burning odor	Severe overheating, debris buildup, or incompatible operation	Stop immediately and inspect the tool and bit	Not until the cause is identified
Bit stops cutting	Worn cutting surface, harder tile than expected, wrong speed, or blocked cutting edge	Stop, clear debris safely, verify the material, and replace the bit if necessary	Only with suitable, serviceable tooling
Progress is unexpectedly slow	Porcelain or stone mistaken for ceramic, worn bit, poor alignment, or incorrect cooling	Recheck the material and bit documentation	Do not compensate with hammer mode or heavy force
Crack or cracking sound	Existing weakness, edge stress, excessive force, vibration, heat, or poor support	Stop immediately and inspect the tile	No, until the damage and consequences are assessed
Small chip around the hole	Wandering, excess pressure, incorrect diameter, or breakthrough damage	Check for radiating cracks and confirm that the hole still meets the fastener specification	Only after confirming suitability
Oversized hole or loose anchor	Wandering, wrong diameter, damaged substrate, or unsuitable anchor	Remove the load and consult the fastener documentation	Do not improvise a load-bearing repair
Tile moves while drilling	Loose bond, unsupported area, or substrate failure	Stop and withdraw the bit carefully	No; repair or replace the tile first
Unexpected layer or cavity appears	Wall assembly differs from assumptions	Stop and identify the material or obstruction	Only after revising the plan
Cooling water cannot be controlled	Incompatible setup or inadequate runoff control	Stop and reassess the specified drilling method	No, until an approved setup can be maintained

If the bit skates, do not increase pressure. Stop the tool, verify that the bit is intended for glazed ceramic, replace torn tape, and use a compatible guide. Do not strike the glaze with a nail or center punch.

If the bit becomes very hot, discolors, smokes, or stops cutting, stop. Allow it to cool by the method its manufacturer permits. Inspect for a flattened carbide tip, lost diamond abrasive, distortion, or other damage before continuing.

Unexpectedly slow progress may mean the tile is porcelain or stone rather than standard ceramic. It may also indicate a worn or incompatible bit. Reidentify the tile and change tooling rather than activating hammer mode or leaning heavily on the drill.

Visible cracking or a cracking sound is an immediate stop condition. The supplied evidence does not establish that epoxy or another improvised repair restores the tile, fastening capacity, or waterproofing. Replacement or qualified assessment may be necessary.

A chip hidden by fixture hardware is not automatically acceptable. Check whether it has produced a radiating crack, enlarged the hole beyond the fastener specification, exposed unsupported material, or affected a wet-area assembly.

Likewise, do not fill an oversized load-bearing hole with an improvised compound and assume that the anchor has regained its documented capacity. Depending on the installation, the appropriate response may be to relocate the fixing, replace the tile, repair the substrate, use a fastener-manufacturer-authorized solution, or seek qualified advice.

Recurring causes of damage include:

Wrong bit for the material
Excessive speed
Excessive pressure
Hammer or percussion action
Poor alignment
Inadequate support
Overheating
Side loading
A worn cutting surface
Drilling near a vulnerable edge
Continuing blindly into the substrate
Overtightening installed hardware

Call an appropriate qualified professional when wiring or plumbing is suspected; waterproofing or embedded heating is uncertain; the tile is cracked or loose; the wet-area consequences are significant; mounting support cannot be confirmed; or correctly selected bits repeatedly overheat or fail.

Frequently asked questions

Can I use a regular masonry bit to drill ceramic tile?

Possibly, but “masonry bit” covers different designs, and published guidance conflicts. Some sources accept certain carbide-tipped masonry bits for softer ceramic, while others advise against ordinary masonry bits on the glazed face.

The safer general choice is a tungsten-carbide ceramic or glass bit expressly labeled for standard ceramic tile. Do not assume that a masonry bit intended to work by percussion in concrete should be used with hammer action on tile.

Should I use hammer mode when drilling ceramic tile?

No. Keep hammer or percussion action off while the bit is penetrating or bearing against the tile. Impact increases the risk of chipping or cracking the brittle material.

If the backing is brick or concrete, hammer action may be appropriate only after the cutting section has completely cleared the tile and only when the substrate, drill, bit, and manufacturer instructions permit it.

What speed should I use to drill ceramic tile?

Use the speed specified for the exact bit diameter, tile, and tool. In general, begin at a low, controllable speed with light pressure. Do not treat one generic RPM as correct for every ceramic or diamond bit.

If the bit overheats, discolors, or stops cutting, stop and check the product instructions rather than assuming that more speed will solve the problem.

Do I need water when drilling ceramic tile?

Only if the bit’s instructions specify or permit wet drilling. Some tile bits use water for cooling and debris suppression, while dry-rated diamond systems may rely on different cooling and movement requirements.

Do not transfer a wet procedure to a dry-only bit or assume that every dry bit can run continuously. Use only a cooling setup compatible with the bit, tool, and work area.

Can I use the same method for porcelain tile or a large plumbing hole?

The broad principles remain similar: use compatible tooling, keep impact action off in the tile, stabilize the start, control pressure and heat, and reduce pressure near breakthrough. The bit usually changes.

Porcelain generally calls for diamond tooling rated for porcelain. A large plumbing opening normally requires a diamond hole saw or core bit rather than a small spear-point ceramic bit. Confirm the tool, arbor, speed, starting method, and wet-or-dry procedure for the exact product before drilling.

The sequence to remember

Identify the tile and backing. Choose a tile-rated bit for the required hole size. Stabilize the start, keep hammer action off, and drill slowly with light pressure. Manage heat exactly as the bit requires, ease off near breakthrough, and stop after penetrating the tile. Then treat the substrate and anchor as a separate installation problem.

Patience and correct tool matching reduce risk. Uncertainty about concealed services, waterproofing, damaged tile, or mounting support is a reason to stop and obtain qualified help—not a reason to drill and hope.