Walk-behind floor saw cutting a straight trench line into a concrete slab

Method 05

Floor saw cutting in Abu Dhabi, Dubai & Al Ain

Walk-behind slab sawing for service trenches, movement joints, floor openings and pavement cutting. Long straight cuts at speed, on ground slabs and suspended floors.

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CapabilityLimits

Maximum depth500 mmSingle pass, blade dependent

Blade diameter350–1200 mm

Cut speedHighFastest method per linear metre

SubstrateRC slab, screed, asphalt

PowerPetrol / electric / hydraulicElectric indoors and in car parks

Line accuracy± 5 mmGuided along a set line

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What it is

When to specify floor sawing

Floor sawing uses a walk-behind machine with a large diamond blade running on a fixed axle, cutting downward into a horizontal surface. It is by a wide margin the fastest method per linear metre, which is why it is the default for trenches, joints and long straight cuts across a slab.

The most common uses are service trenches for drainage and electrical routes, movement and control joints in new slabs, and cutting the perimeter of a floor opening before the section is lifted out. On industrial jobs across Mussafah, ICAD and Al Quoz it is also the method for cutting out damaged bays for replacement.

Depth is limited by blade diameter, and every extra 100 mm of cut depth needs a substantially larger blade and machine. Where the slab is thicker than a single pass can manage, we either cut from both faces or move to wire sawing, and we will tell you which at survey.

Floor sawing Walk-behind floor saw cutting a straight trench line into a concrete slab

Applications

What we use it for

Service trenches

Straight parallel cuts forming trenches for drainage, chilled water, electrical and communications routes through existing slabs.

Movement and control joints

Saw-cut joints in new slabs, timed against the pour so shrinkage cracking is controlled rather than random.

Floor openings

Perimeter cuts around stair, lift and riser openings, ready for the section to be lifted or broken out.

Bay replacement

Damaged or contaminated slab bays cut out cleanly to a square edge for replacement concrete.

Car park and roadway cutting

Asphalt and concrete cutting for repairs, ramp alterations, drainage runs and service crossings.

Demolition preparation

Slabs pre-cut into liftable sections so demolition proceeds by removal rather than by breaking.

Sequence

How the job runs

STEP 01

Set out the line

Cut lines marked from the drawing and agreed on site, with falls and levels checked where drainage is involved.

STEP 02

Scan the slab

GPR run along the cut line to locate reinforcement, post-tension cables and buried services before the blade goes in.

STEP 03

Cut in passes

Blade set to depth and the cut run in controlled passes, with water fed to the blade throughout.

STEP 04

Lift and clear

Sections lifted or broken out, slurry vacuumed and bunded, edges dressed and waste removed from site.

Site control

Post-tensioned slabs and why scanning is not optional

A large proportion of suspended slabs in Dubai and Abu Dhabi towers are post-tensioned. Cutting a post-tension cable releases stored energy instantly and can cause serious injury as well as structural damage that is expensive and slow to remediate.

There is no visual way to tell a post-tensioned slab from a conventionally reinforced one once it is finished. We scan every suspended slab before floor sawing, mark the cable runs on the surface, and set the cut line to clear them. Where the required cut cannot avoid a cable, we stop and refer it back to the structural engineer.

On ground slabs the risk is different but still real: buried drainage, electrical ducts and chilled water lines all sit under floors and rarely match the as-built drawing.

Concrete cutting equipment prepared for a UAE site

Cut section of a suspended concrete slab being lifted clear by crane

Concrete Slab Demolition

Suspended and ground slabs cut into sections and lifted out.

Propped & craned→

Operator running a ground penetrating radar unit across a concrete slab

Concrete Scanning

GPR survey and marked-up plan before any blade goes in.

To 600 mm→

Core drilling rig drilling downward through a suspended concrete floor slab

Concrete Slab Core Cutting

Downward coring through suspended and ground floor slabs.

Ø25–600 mm→

Questions

Floor sawing questions

How deep can a floor saw cut?

Around 500 mm in a single pass with a large blade, though most jobs sit well under that. Depth is directly limited by blade diameter, so cutting deeper needs a bigger machine rather than more time. Where a slab is thicker than one pass allows, we cut from both faces if accessible, or specify wire sawing instead.

Do you cut post-tensioned slabs?

Yes, but only after scanning. Post-tension cables carry stored energy and cutting one is dangerous as well as structurally damaging. We run GPR over the full cut line, mark cable positions on the surface, and set the cut to clear them. If the required line cannot avoid a cable, we stop and refer it back to the structural engineer rather than proceed.

Can you cut indoors or in a basement car park?

Yes. We use electric and hydraulic machines indoors and below ground because petrol saws produce exhaust fumes that are unacceptable in enclosed spaces. Water is fed to the blade and slurry is vacuumed and bunded so it does not reach drainage gullies or lower levels.

How do you stop slurry spreading across the floor?

The cut is bunded and a wet vacuum runs alongside the saw collecting slurry as it is produced. On finished floors we also sheet and protect the surrounding area. Slurry is collected into containers and removed from site rather than washed into the nearest gully, and disposal is included in the quoted figure.

Is floor sawing cheaper than other methods?

Per linear metre, yes, which is why it is the default wherever the geometry suits it. A long straight cut on a horizontal surface is the fastest thing a diamond blade can do. The cost only rises when depth exceeds a single pass or when access forces a smaller machine into a job it is not sized for.