GUIDE 09 · QUANTITY TAKEOFF

How to Calculate Formwork Sheet Quantity & m²: Cutting Waste & Cycle Takeoff Guide

Author: İdris YAĞMAHAN / Mimar (Architect) Published: 28/03/2026 Read Time: 7 minutes Category: Quantity Takeoff

Formwork Sheet Area and Quantity Calculation

Quick Technical Specification

Verified Engineering Specs

Levha Net Alanı 1250 × 2500 mm = 3.125 m² Single Sheet Area

Kiriş Çarpanı Gross Slab Area × 1.25 – 1.40 Including beam sides & drops

Tavsiye Edilen Fire 5% – 7% for Polymers Timber plywood: 12% – 15%

Kalıp Devir Planı 7-Day Turnaround: 1 Slab Set + 1.5 Shore Support Sets

Toplam İhtiyaç Adedi 50-Story Tower Completed with a Single Shuttering Set

Online Hesap Makinesi Instant Dynamic Sizing: https://plastikplywood.com/en/calculator/sheet-count

1. Significance of Accurate Formwork Quantity Takeoff
2. Sheet Geometry & Unit Area (3.125 m²)
3. Floor Area to Contact Surface Multipliers
4. Waste Optimization: Timber (15%) vs Polymer (6%)
5. Worked Example: 1,000 m² Slab Takeoff

1. Significance of Accurate Formwork Quantity Takeoff

Formwork sheeting represents one of the largest early capital commitments on concrete jobsites. With traditional plywood, contractors continuously re-ordered replacement sheets due to rot. With SerPlywood 60+ reuse polymer panels, an accurate upfront calculation determines the entire project's inventory once and for all.

2. Standard Sheet Dimensions

Standard international metric panel size is 1250 × 2500 mm, providing 3.125 m² per sheet. For beams and narrow columns, 625 × 2500 mm panels provide 1.5625 m².

3. Worked Example: 1,000 m² Slab Takeoff

• Net Floor Footprint: 1,000 m²

• Beam Multiplier: 1.30 -> Total Contact Surface = 1,300 m²

• Polymer Cutting Allowance (6%): 1,300 × 1.06 = 1,378 m²

• Total 18mm Sheets Needed: 1,378 / 3.125 = 441 Sheets (9 Pallets of 50)

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Frequently Asked Questions about Formwork Quantity Takeoff

Frequently Asked Questions

Common questions regarding board selection, reuse cycles, technical parameters, and global delivery.

What dimensions, thicknesses, and weights are available?

Our standard board dimension is 125 × 250 cm (1250 × 2500 mm = 3.125 m²). An optional 62.5 cm width and custom-cut lengths are available for columns and beams. Thicknesses and net sheet weights are: 15 mm (28 kg / 8.96 kg/m²), 18 mm (32 kg / 10.24 kg/m²), and 21 mm (41 kg / 13.12 kg/m²).

Can an 18 mm board be used in all formwork types?

Thickness alone does not determine full suitability. Polymer structure, fresh concrete hydrostatic pressure, support joist spacing, and framing connections must be evaluated within a proper formwork design.

Can plastic formwork boards be used for slab formwork?

Yes, products certified for slab loads can be safely deployed over H20 timber beams, table forms, or steel framing systems.

How does the board behave in hot and cold weather?

Thermopolymers expand in heat and gain rigidity in severe cold. Therefore, an expansion joint gap (1.5 – 2 mm) recommended by the manufacturer should be maintained at board joints.

Is it necessary to apply formwork release agent (form oil)?

Because polymers do not chemically adhere to concrete, release agent requirements are minimal and often eliminated in routine pours. For pristine architectural finishes, a light water-based release agent may be applied.

How are plastic formwork board prices determined?

Pricing is determined by polymer type (PP/PVC), thickness (15, 18, 21 mm), order volume (sheets, pallets, full container/truckload), and delivery terms (jobsite, warehouse, or seaport).

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