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KnowledgeEngineering
Ref 07.2.03 · 4 min read
BETA · Knowledge Centre
Ref BP · KC · 07.2.03
Engineering · Section 07.2

Subfloors.

The substrate types encountered in commercial construction and the performance requirements each imposes.

Author
BETA Projects · Technical Desk
Category
Engineering
Reading Time
4 minutes
Reference
BP · KC · 07.2.03

Commercial subfloors fall into three general categories: cementitious slabs (in-situ or precast), plywood or particleboard on joists, and existing hard finishes retained under an overlay. Each imposes different moisture, flatness and bonding requirements.

01Concrete slabs

The dominant substrate in commercial and multi-residential construction. Moisture content and surface soundness are the primary variables. Slabs cure over months, not days; installation windows must respect the cure state.

02Sheet substrates

Plywood and particleboard require verified flatness, secured fixing and moisture equilibrium with the eventual service environment. Structural deflection under load must be within manufacturer tolerance for the finish being installed.

End of entry
07.2.03 · BETA Projects
About the author
BP
BETA Projects · Technical Desk
Written and held current by the BETA Projects reference team.

Reference entries in the Knowledge Centre are authored by the BETA Projects procurement and technical desk — the same operators who qualify factories, run inspections and manage commercial supply for commercial builders and developers. Content is reviewed against active project experience and updated as manufacturing practice moves.

Editorial · Technical Desk
Review · Procurement Lead
Held Current · 2026
Related resources

Adjacent entries in Engineering.

  1. EN · 014 Min

    Moisture movement

    How hygroscopic materials respond to ambient humidity, and the tolerances designed to accommodate that movement.

    Read entry →
  2. EN · 023 Min

    Expansion gaps

    Sizing perimeter and intermediate gaps against species, format and floor area.

    Read entry →
  3. EN · 034 Min

    Substrate preparation

    Grinding, patching and priming — the pre-installation work that determines long-term performance.

    Read entry →
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