← Concrete Saws

Early Entry Saw

An early entry saw cuts control joints into concrete while it is still green — typically within the first hours after finishing — using a skid plate that supports the surface at the blade to prevent chipping and raveling. Cutting before shrinkage stresses develop stops random cracking.

Models

0–8 in or deeper than 8 in

Capacity

Brands

How it works

The saw rides on a flat skid plate rather than wheels at the cut, holding the green surface down on both sides of a dry-cutting diamond blade as it enters. An up-cut or down-cut blade action combined with the plate keeps the joint edge clean at an age when a conventional wet saw would tear and ravel the slab. Joints are cut shallow relative to conventional sawing — the early timing, not depth, controls cracking — and the saw follows the finishing crew across the placement in the same working window.

Types & variants

Compact early entry saw: Residential and light commercial finishing; one-person machines that follow the crew across the placement.
Larger early entry saw: Deeper early-entry cuts on thick commercial slabs and paving joints.
Down-cutting skid saw: Blade rotation presses the surface into the skid plate — the design principle behind clean green-concrete joints.

Key specifications

Specification	Typical range	What it means
Capacity	0–8 in or deeper than 8 in	Industry separates compact saws for residential and light commercial slabs from deeper-cutting machines for thick commercial floors.
Skid plate	replaceable anti-ravel plate at the blade	Supports the green surface at the cut; plate condition directly controls joint edge quality.
Blade type	dry-cut diamond blade for green concrete	Green-concrete blades are specified for early cutting and differ from cured-concrete wet blades.

How the industry sizes it

Early entry saws are sized by cutting depth capacity: machines up to 8 in serve residential and light commercial slabs, while deeper-cutting machines handle thick industrial floors and paving. Because the method depends on timing, saw capacity is chosen so jointing keeps pace with the finished area before the cutting window closes.

Applications

Control joints in warehouse and industrial floors
Same-day jointing on driveways and sidewalks
Parking lot slab joints
Highway and airport paving joints
Bridge deck jointing
Interior slabs in occupied or enclosed buildings

Safety & operation

Early entry cutting is typically a dry process on green concrete — silica dust control by vacuum shroud or dust-suppression accessories applies even though the concrete is young.
The blade runs exposed at slab level near the finishing crew; guard and skid plate must be intact and bystanders kept clear of the cutting line.
Green slabs are walked while barely set; access is planned so the operator does not mar finished surface or trip on embedded items.

Standards & certifications

OSHA · 29 CFR 1926.1153: Respirable crystalline silica controls for concrete sawing, including dust collection on dry-cut joint saws.
ACI · 302.1R: Floor and slab construction guide — joint layout and the timing window for early-entry sawing.

Frequently asked

How soon after finishing can joints be cut?

Within the green-concrete window — generally the first hours after final finishing, as soon as the surface supports the saw without raveling. The skid plate design exists to make cutting possible that early.

Why cut early instead of waiting for a conventional saw?

Shrinkage stresses build as concrete cures; joints cut after cracking stress develops may be too late. Early cutting installs the crack-control plane before random cracks can start.

What separates compact and larger early entry saws?

Capacity and duty: machines up to 8 in follow finishing crews on residential and light commercial slabs, while deeper-cutting machines serve thick industrial floors and paving joints.

Do early entry saws cut as deep as conventional joint saws?

No — the method relies on timing rather than depth, cutting a shallower joint that still governs where the slab cracks.