ground and upper floor

  • Introduction to Multi-Story Buildings

    • Adaptations to support height include:

      • Moments and simple connections

      • Shear walls

      • Building cores (also referred to as tubes)

      • Variations: tube-in-tube structures, bracing, and bumping tubes

  • Ground Floors in Commercial Buildings

    • Importance of understanding ground floors as it relates to:

      • Portal frame structures and multi-story buildings

    • Two main types of ground floors:

      • Ground bearing (ground supported) floors

      • Suspended floors

    • Reference to previous knowledge (ResTech) applied to commercial structures

  • Ground Bearing Floors

    • Includes SR21 compliance due to issues with pyrite

      • SR21 specifies the stone types (T1, T2, T3) to use in foundations

    • Discussion of radon barriers and insulation for underfloor heating

    • Differences in approach between residential and commercial designs, especially regarding ventilation

  • Suspended Floors

    • Clarified that suspended floors do have a subfloor, despite misconceptions

    • Importance of ventilation in choosing design approaches for suspended floors

    • Less common in industrial settings due to heavy machinery loads

  • Construction Considerations

    • Decision-making process for QS when evaluating floor types based on grading and cost-effectiveness

    • Historical context on use of plastic barriers against damp (pre-1960 vs. current practices)

  • Floor Finishing Processes

    • Overview of two processes for creating durable floors:

      • Flow finish: initial rough finish

      • Trowel finish: a two-step process that adds durability

    • Impact of floor finish decisions on pricing and long-term maintenance

    • Distinction between different sealant types for specific industry uses (e.g., chemicals)

  • Raised Access Floors

    • Used in environments like data centers for effective wiring and ventilation

    • Noted the cost implications of finishes between different types of raised access floors

  • Steady State Heat Flow

    • Explained geothermal heating and its implications for flooring insulation in conditioned buildings

    • Discussed the insulation ratios for perimeter areas based on total floor area

    • Importance of thermal performance around large commercial buildings

  • Movement and Expansion Joints

    • Necessity of movement joints in large floor areas to manage thermal and moisture expansion/contraction

    • Induced joints cut after curing to prevent cracking

    • Detailed on expansion joints, their placement, and implications on structural integrity

    • The chemical reactions in concrete curing explained, emphasizing the importance of moisture management for strength

  • Induced Joints

    • Key for preventing random cracking due to concrete shrinkage during curing

    • Need for placing steel reinforcement at specific depths based on tension and contraction concerns

  • Upper Floors in Multi-Story Buildings

    • Covered general types of floors used depending on construction frame (steel or concrete)

    • Precast vs. in situ concrete explained, including benefits and challenges

    • Summary of other floor types (e.g., prestressed, hollow-core) and their installation details

    • Discussion on advancements in sustainable building materials (such as cross-laminated timber) and their impact on future constructions

  • Final Remarks

    • Emphasized understanding the entire floor build-up details, from the ground through to upper structures

    • Suggested attention to heat flow, insulation practices, and structural consequences when designing and assessing commercial flooring systems.