Choose a Hand Screed by Span and Control—not Just Material

For form-supported strikeoff, choose a straight, rigid screed long enough to span the grade supports and maintain bearing throughout the screeding stroke. Avoid unnecessary length, and check whether the crew can control it from the available working positions. A longer tool covers more width, but that is no advantage if its ends lose support or its center deflects during the pull.

A hand screed is a non-powered straightedge used to strike off fresh concrete: it removes excess material and establishes the surface at the intended elevation or slope. It is not a finishing trowel, and “leveling” does not mean making a drainage slab horizontal. Concrete Network’s screeding guide describes this initial grade-setting operation.

Match length to the supported span

For a screed riding on forms or rails, measure between those grade supports—not simply across the overall slab. The screed must remain supported at both ends as it moves side to side.

For example, a 6-foot screed across a 4-foot clear opening leaves roughly 1 foot beyond each inside form edge when centered. That is a layout example, not a universal overlap requirement: check actual form width, stroke and obstructions before choosing the tool.

Before ordering, settle four points:

• Support spacing: Can the straightedge bridge the planned placement strip without excessive bending?
• End clearance: Will stakes, walls, columns or adjacent work interfere with the stroke?
• Crew access: Can operators maintain stable footing and a consistent pull without overreaching?
• Grade geometry: Can one straightedge follow the intended plane, or does the slab change slope at a drain or ridge?

A longer screed cannot follow two different planes at once. Plan the grade references and placement strips around those changes rather than trying to force the tool into shape. For perimeter setup, see choosing and setting sidewalk forms.

Wood, aluminum or magnesium?

Material	When to consider it	What to check
Straight wood 2×4	Occasional small work where a suitable board is available	Bow, twist and damage along the working edge; reject warped lumber
Aluminum straightedge	Repeated use where a purpose-made profile and cleanable surface are useful	Section dimensions, internal bracing, end caps and actual tool weight
Magnesium straightedge	Repeated hand screeding where reduced carrying and handling weight matters	Weight of the specific model, wall/profile design, grip and end caps

Concrete Network identifies wood, hollow aluminum and magnesium straightedges as options, and warns that warped wood can leave ruts or crowns. It also recommends capped ends to keep wet concrete out of hollow tools.

Material alone does not establish stiffness. Cross-section, wall thickness, internal reinforcement and length also matter. Marshalltown’s aluminum screed range, for example, uses an H-style section with a full-length center brace. Kraft’s 20-foot magnesium screed uses thicker walls on its 2-inch side to help hold its shape.

Kraft describes that magnesium product as 30% lighter than similar aluminum screeds. Treat this as a manufacturer comparison—not a guarantee that every magnesium tool is lighter than every aluminum tool. Compare actual operating weights, not shipping weights, and include any handles.

Inspect the working edge and grip

A useful buying inspection is more important than choosing by alloy name:

• Sight along the working edge and compare it against a known-straight reference.
• Check for dents, twists, burrs and hardened concrete that could affect contact with the forms.
• Inspect end caps; missing caps let concrete accumulate inside the tool.
• Hold the tool with the gloves you will use. A sharp or awkward profile makes consistent control harder.
• Confirm how the full length will travel to site and be stored without damage.

Do not assume a built-in bubble level establishes the required grade. It indicates the tool’s orientation; the forms or grade references must still establish the specified elevation and drainage slope.

Use it for strikeoff—not bulk concrete movement

The NRMCA CIP 14: Finishing Concrete Flatwork guide gives the basic hand method:

1. Spread and consolidate the concrete before strikeoff. Use a shovel or concrete come-along for spreading rather than dragging a large pile with the screed.
2. Rest the straightedge on edge on top of the forms, tilt it forward and draw it across with a slight sawing motion.
3. Keep a little concrete ahead of the edge to fill low spots.
4. Follow promptly with initial bull floating or darby work before bleed water appears. Later finishing must wait until bleeding has stopped and the surface water sheen is gone.

A hand screed does not replace the planned consolidation method. For the wider placement sequence, see concrete screeding tools, setup and strikeoff.

Wet concrete also creates a skin-burn hazard. Use gloves suitable for wet cement, waterproof boots where contact is possible, and eye protection; keep concrete out of protective clothing. Remove contaminated clothing and wash exposed skin promptly. OSHA’s Portland cement guidance warns that burns may develop without immediate pain and advises immediate medical attention for a cement burn. Stable footing and a manageable screed length belong in the pre-pour plan, not in adjustments made after the concrete arrives.