Technoblock Slab Calculator

Slab geometry

Slab length, L

Slab width, W

Block type & depth

Technoblock type

Stacking extender (#190 only)

Extenders are 1230 mm long; one covers 4 blocks.

Slab build-up

Rib / lintel centres

Structural topping thickness

Typical detail: 65 mm topping with REF 193 mesh (engineer to confirm).

Materials & allowances

Concrete unit weight, γ_c

kN/m³

Assumed EPS body density, ρ_EPS

kg/m³

Block-body density is not published (“mid-density FR EPS”) — assumed value, used for handling-weight estimates only.

Waste / cutting allowance

Typical one-way detail (dimensioned CAD drawing): #190 block + 65 mm topping = 255 mm structural depth; ribs 160 mm wide at 660 mm centres (500 mm block face between ribs); 2 × Y12 per rib; REF 193 mesh; lintels, bearing and propping per the project structural engineer.

1 · Technoblock quantities

Technoblocks required

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Blocks per m² (derived)

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Bundles (30 / bundle)

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End caps (free, 6 per 5 blocks)

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Extenders (1 covers 4 blocks)

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Blocks per m² is a geometric derivation from the dimensioned CAD module (rib centres × block width) — it is not a published Technopol figure. Confirm quantities with Technopol before ordering.

2 · Concrete volume

Topping

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Ribs (approx. from geometry)

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Total concrete

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Rib volume is approximated as the full rib width × void depth (this includes the pre-cast lintel section within the rib). Reinforcement, mesh and grout losses are excluded. With extenders, ribs are assumed to run the full void depth — extender cross-section is unpublished, so this is a conservative approximation.

3 · Self-weight vs equivalent solid slab

Rib-and-block slab self-weight

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Solid RC slab, same depth

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Dead-load saving vs solid slab

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LIGHTER

4 · Block handling weight (estimate)

One block (estimated)

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One bundle of 30 (estimated)

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Block weight is not published and the body density is unverified — these are geometric estimates at the assumed density. The brochure claim is qualitative: much lighter than cement “ash” blocks, easier to handle, less labour time. All EPS is combustible — keep blocks away from open flame during storage, handling and installation before casting.

Disclaimer. This tool gives indicative quantities for estimating and comparison only. The Technoblock is non-structural permanent shuttering: rib spacing, topping thickness, reinforcement, propping and allowable spans are set by the project structural engineer — Technopol publishes no span or load tables for the #120 / #190 catalogue. Blocks-per-m² is derived from the dimensioned CAD module and block weights are estimates (body density unpublished); confirm both with Technopol before ordering. Equivalent-solid-slab comparison uses the same overall depth at γ_c as entered.

Fire. Technoblocks are moulded from flame-retardant (FR) EPS; the FR-EPS grade holds a current SANS 53501-1 reaction-to-fire classification of B-s1,d0 (report IT 23-08-00009). Reaction-to-fire is not a fire-resistance rating: no FRxx rating is claimed for the block itself, and fire resistance of the finished floor is a property of the complete engineered slab, in which the EPS is fully encased in concrete. Not an Agrément-certified line.