Screw Anchors vs. Concrete Deadweight Blocks: The Definitive Comparison
A 4-metre helical screw anchor in sandy bottom delivers 20–50 tonnes of holding capacity. To match that with concrete, you need a 12–15 cubic metre block weighing 25–30 tonnes. The data makes the choice obvious.
What You're Actually Choosing Between
To match the holding capacity of a single 4-metre screw anchor, you need a 12–15 m³ concrete block. Here's what that looks like.
✅ Helical Screw Anchor
4 m shaft · 3 helical plates
❌ Concrete Deadweight Block
12–15 m³ · crane barge required
The screw anchor installs from a small work boat in hours. The concrete block requires a crane barge, concrete logistics, and days of curing.
Same holding capacity target. Radically different means of achieving it.
Convinced? See Exactly How We Install Them.
From site assessment and soil analysis through hydraulic installation, torque recording, and on-site capacity certification — our five-step process leaves nothing to chance.
See How We Install Screw Anchors