A fundi is finishing a kitchen floor in a new house outside Nakuru. The tiles are glossy 600 by 600 porcelain, the client chose them herself, and there are exactly enough boxes with four spare tiles. By midday two of the spares are gone: one cracked across the corner on a grinder cut, the other chipped along its glazed edge where the disc wandered. The last row along the wall still needs eleven cuts, and the client is standing in the doorway.
Tiling is unforgiving because the material is brittle, glazed and expensive, and because every cut edge ends up where somebody will look at it for the next twenty years. The tool you cut with decides how clean that edge is, how much dust fills the house, how many tiles you break, and how long the job takes. In most Kenyan builds the choice comes down to two tools: a manual tile cutter on a rail, or an angle grinder with a diamond disc.
This guide explains how each one actually cuts, where each wins on ceramic, porcelain and large-format tiles, how to stop chipping, how to handle the dust safely, and what each costs to own. It ends with a simple rule for which cut goes to which tool on a real floor.
How Each Tool Actually Cuts a Tile
A manual tile cutter does not cut through the tile at all. A small hardened scoring wheel runs along a rail and scratches a single line through the glaze. A breaker foot then presses down on either side of that line, and the tile snaps cleanly along it, the way glass snaps along a glass cutter's line. No motor, no dust, no noise, and the rail holds the line straight for the whole length.
An angle grinder fitted with a diamond disc grinds its way through the full thickness of the tile. The disc's rim carries industrial diamond grit that abrades the ceramic body. Because the operator guides it by hand, it can follow any line: a curve around a toilet flange, an L-shaped notch around a door frame, a slot for a pipe. The price is dust, noise and an edge that depends on how steady the hands are.
Bigger sites also use a powered wet tile saw, a diamond blade cooled by water, which gives the cleanest porcelain edge with little dust. It is a contractor's machine. For the fundi and the small builder, the cutter and the grinder do the work.
Where the Manual Tile Cutter Wins
The cutter wins on every straight cut that runs the full width or length of a tile: the border row along a wall, the strip at a doorway, the row under a kitchen counter, the skirting tiles cut from floor tiles. On a typical room these are the majority of the cuts, and they are the ones people see most, because they run in long visible lines.
It also wins on edge quality. A snapped edge on glazed ceramic is clean and straight with the glaze intact right to the edge, so it can sit against the wall or against a factory edge without a visible difference. A grinder edge, however careful the hand, usually shows small chips in the glaze and a slight wave along its length.
And it wins inside an occupied house. A cutter makes no dust and almost no noise, needs no power, and can sit in the room being tiled, so the fundi measures, cuts and lays without walking out to the yard for every tile. The TOTAL TILE CUTTER(800MM) on our price list is the kind of rail cutter that suits floor and wall work in Kenyan homes.
Where the Angle Grinder Wins
The grinder wins wherever the cut is not a straight line across the whole tile. L-shaped notches around door frames and wall corners, cut-outs for a floor trap or a toilet waste, a curve around a pedestal basin, a slot for a water pipe coming out of a wall, and the trimming of a tile that is a few millimetres too long. A cutter cannot do any of these.
It also wins on narrow strips. A rail cutter needs enough tile on each side of the scored line for the breaker foot to press against; very thin slivers tend to snap off-line or crumble. As a rule of thumb, strips narrower than about two centimetres are easier taken off with a grinder or avoided altogether by adjusting the layout so the last row is wider.
Finally the grinder handles material the cutter struggles with: thick natural stone, very thick or textured outdoor tiles, and cutting tiles already fixed on the wall when a socket box was forgotten. Fit a diamond disc made for tile and stone, never an abrasive metal-cutting disc. Our guide to angle grinder discs explains the difference, and the angle grinder buying guide covers machine size.
Ceramic, Porcelain and Large-Format Tiles
Ceramic tiles have a softer, more porous clay body under the glaze. They score easily and snap readily on a cutter, and a grinder goes through them quickly. Most wall tiles and many budget floor tiles in Kenyan hardware shops are ceramic.
Porcelain tiles are fired harder and are much denser, which is why they are chosen for floors, verandas and commercial spaces. They need more pressure on the scoring wheel, a sharp wheel, and a decisive snap. On a grinder they cut more slowly and heat the disc more, so let the disc do the work and do not force it. Many porcelain tiles are also thicker, so check the maximum tile thickness your cutter is rated for before buying the tiles for a job.
Large-format tiles, now common in Kenyan living rooms, change the arithmetic. A cutter can only cut a line as long as its rail, so the useful question is not the tile size but the longest cut you will make on it. A diagonal cut is longer than either side: the diagonal of a square tile is about 1.41 times its side. The figure below shows what that means for an 800 mm cutter.
So an 800 mm rail handles every straight cut on a 600 by 600 tile and every cut on smaller tiles, which covers the bulk of Kenyan floor work. For a diagonal layout on 600 by 600 tiles, or a long rip down a 1200 mm plank, plan those cuts for the grinder with a straightedge clamped as a guide, or hire a longer cutter for the job.
Stopping Chips, Cracks and Wasted Tiles
Most wasted tiles come from a handful of avoidable mistakes. On the cutter:
- Mark on the glaze, align on the guide: set the tile tight against the cutter's fence so the line runs square, then check the wheel sits exactly on your mark before scoring.
- Even pressure, one pass: push the wheel across in one steady stroke with firm, constant pressure. Hesitation leaves a gap in the score where the snap will wander.
- Keep the wheel sharp and clean: a dull or clogged wheel skates over hard porcelain and leaves a faint line that will not snap true. Brush grit off the rail and wheel after each job.
- Snap at the centre, then the ends: follow your cutter's instructions, but in general a firm press at the middle of the line gives the cleanest break.
On the grinder:
- Support the whole tile: lay it flat on a firm board or on spare tiles so the offcut cannot drop and snap the corner as you finish the cut.
- Cut from the face, slowly: run the disc along the line with light pressure. Forcing a diamond disc through porcelain overheats it and causes the chipping you were trying to avoid.
- Mask the line: a strip of masking tape along the cut, marked on top, is a common trick that reduces glaze chipping and makes the line easier to see.
- Notch with relief cuts: for an L-shape, make the two straight cuts first and stop short of the inside corner, then finish the corner carefully. Overrunning the corner leaves a crack starter in the tile.
Dust, Noise and Safety
Cutting tile with a grinder produces fine mineral dust. Ceramic and porcelain bodies, like concrete and stone, contain crystalline silica, and breathing that fine dust over months and years is a recognised cause of serious lung disease. A cloth over the face does not stop it. Cut outdoors with the wind behind you, keep other people away from the cloud, and wear a properly fitted dust mask or respirator rated for fine particles. Wetting the cut line with a sponge as you go also reduces the dust a great deal.
Beyond dust, a grinder with a diamond disc carries the usual grinder risks: keep the guard on, hold the tool with both hands, wear eye protection and ear protection, and never cut a tile balanced on your knee. Diamond discs have a rated maximum speed; check it matches or exceeds your grinder's speed. In wet season rooms, keep the power lead off wet floors and run it through a sound extension, as our guide to extension cables and electrical safety explains. Our workshop safety equipment guide covers the masks and eye protection worth buying.
Cost to Own: What the Kit Costs at Fuga
These are current Fuga prices for the kit a tiler needs to cover both kinds of cut. Prices are from our price list and can change, so confirm at the branch or on WhatsApp before buying.
| Item (as listed) | Price | What it does on a tiling job |
|---|---|---|
| TOTAL TILE CUTTER(800MM) | 10,600 KSH | All straight cuts up to its rail length, clean edges, no dust |
| ANGLE GRINDER 750W | 4,500 KSH | Notches, cut-outs, curves and narrow strips |
| ANGLE GRINDER 900W | 5,000 KSH | The same jobs with more power for thick porcelain and stone |
| DRY DIAMOND DISC | 400 KSH | Diamond disc for tile and stone; check the size fits your grinder |
| GROUT REMOVER HAND SAW | 350 KSH | Raking out old grout to replace a cracked tile |
| PLASTERING TROWEL | 250 KSH | Spreading and levelling adhesive or mortar |
| MEASURING TAPE 5M/16FT | 88 KSH | Measuring each cut against the wall, not against the last tile |
How should a fundi think about the cutter's price? Not as a cost per tile, but as tiles not broken. Every porcelain tile cracked on a bad grinder cut is a tile the client has paid for and may not be able to match, because a later batch can differ slightly in shade. A tiler doing a room once a year can manage with a grinder alone; one who tiles every week will usually find the cutter pays its way. That is a judgement for your own workload, not a fixed rule.
A Working Rule for Every Floor
On a real job, the two tools work together. Here is the routine many experienced tilers follow:
- Plan the layout first. Dry-lay a row each way from the centre of the room so the cut tiles at both walls are the same width and not thin slivers. A good layout removes the hardest cuts before they exist.
- Measure each cut at the wall. Walls in Kenyan builds are rarely perfectly straight or square, so measure each border tile at both ends rather than cutting a whole row to one figure. Our guide to measuring and layout tools covers the squares and levels that help.
- Straight cuts go to the cutter. Border rows, doorway strips and skirting, all on the rail, all scored once.
- Everything else goes to the grinder, outside. Notches, cut-outs, curves, diagonal cuts longer than the rail, and strips too narrow to snap. Batch them so the grinder and the dust come out once, not twenty times.
- Dress sharp edges. A rubbing stone or a fine file takes the sharp edge off a cut that will be exposed, and protects the grout line and fingers.
Whether you are setting up for your first tiling contract or adding a cutter to a grinder you already own, ask at any Fuga branch or on WhatsApp 0716 961 018. Bring one of the tiles you will be laying and we can check it against the cutter's capacity before you buy.
Key Takeaways
- A manual tile cutter scores the glaze and snaps the tile: it wins on straight cuts, edge quality, dust and noise.
- An angle grinder with a diamond disc wins on notches, cut-outs, curves, narrow strips and cuts longer than the cutter's rail.
- A diagonal across a 600 by 600 tile is about 849 mm, longer than an 800 mm rail, so plan those cuts for the grinder or a wet saw.
- Score once with firm, even pressure; a second pass crumbles the line and the tile breaks off it.
- Grinding tile makes fine silica dust: cut outdoors, wet the line, and wear a mask rated for fine particles.
- Plan the layout so border tiles are not thin slivers, then give straight cuts to the cutter and shapes to the grinder.
Frequently Asked Questions
Can a manual tile cutter cut porcelain tiles?
Yes, as long as the tile is within the cutter's rated thickness and the scoring wheel is sharp. Porcelain is denser and harder than ceramic, so it needs firm, steady pressure in one pass and a decisive snap. A dull or clogged wheel skates over porcelain and leaves a faint score that breaks off the line. Check the maximum thickness printed on the cutter against the tiles before the job starts.
Why do my tiles chip when I cut them with a grinder?
Usually because the disc is forced, the tile is not fully supported, or the wrong disc is fitted. Use a diamond disc made for tile and stone, lay the tile flat on a firm board, mark the line on masking tape, and let the disc cut at its own pace with light pressure. Support the offcut so it cannot drop and snap the corner as the cut finishes.
What length of tile cutter do I need for 600 by 600 tiles?
An 800 mm cutter handles every straight cut on a 600 by 600 tile. It cannot cut the full diagonal, which is about 849 mm, so a diagonal layout needs those cuts done with a grinder and a guide, a longer cutter, or a wet saw. For 600 by 1200 planks, a long cut down the length needs a cutter rated for that length or a different tool.
Is tile cutting dust dangerous?
Yes. Ceramic and porcelain contain crystalline silica, and breathing the fine dust from grinding over time is a recognised cause of serious lung disease. Cut outdoors with the wind behind you, wet the cut line, keep other people away, and wear a properly fitted mask or respirator rated for fine particles. A manual cutter avoids the dust altogether, which is one reason to use it for every straight cut.
How narrow a strip can I cut with a manual tile cutter?
It depends on the cutter and the tile, but very thin strips are hard to snap cleanly because the breaker needs enough tile on each side of the line. As a rule of thumb, strips under about two centimetres are easier with a grinder. Better still, adjust the layout by dry-laying from the centre of the room so the border tiles at both walls are wider.
