Other key structural decisions

Roof Decision: Cut Roof vs. Truss Roof

1. Cut Roof

  • Description: Custom-cut on-site, allowing for future attic conversion.
  • Cost: Generally more expensive due to labor and materials.
  • Flexibility: Offers more adaptability for future changes.

2. Truss Roof

  • Description: Prefabricated and lifted into place with a crane.
  • Considerations: Requires early supplier involvement for design integration.
  • Precision: Trusses are precision-engineered, so all rooflights and openings must be included in the design.

Roof Timber Spacing

  • Standard Spacing: Roof timbers, including trusses, are often spaced at 400mm centers for standard materials.
  • Increased Spacing: Spacing can be increased to 450mm or 600mm, which may reduce timber costs but requires thicker plasterboard and larger timber sections.

Structural Supports and Foundations

  • Timber Frame: Requires on-site foundations and subfloor before erection. The timber frame company can specify foundation details.
  • Architectural Designer: An experienced designer can help avoid early manufacturer commitments and ensure that foundation and structural requirements are met.

Foundation Options:

  • Standard Foundation: Traditional and widely used.
  • Insulated Foundation: Offers better thermal performance but may impact structural drawings and load-bearing requirements. Early site assessment is recommended.

Upper Storey Construction

1. Timber Flooring

  • Advantages: Cost-effective but can be challenging to control sound transmission.
  • Considerations: Requires careful soundproofing measures.

2. Hollow Core Concrete Slabs

  • Advantages: Provides excellent sound insulation and thermal mass.
  • Considerations: More expensive and heavier, necessitating additional structural support. Not as straightforward for routing services.

Staircase and Flooring Choices

  • Staircase Material: Decide between timber or concrete, as this affects structural implications.
  • Prefabricated Joists: Offer better acoustic performance and easier routing of services. They can be a good alternative to solid timber or concrete floors.

Screeds and Insulation

  • Screed Specification: Based on floor structure and finished floor level. Ensure insulation and screed thickness are specified by the engineer.
  • Timber Floors: Must support the screed load, with soundproofing considerations.
  • Engineered Joists: Designed to handle screed loads but come at a higher cost.

Large Open Spans and Glazing

  • Additional Supports: Large spans or cantilevers need extra structural support, often involving more steel, which increases costs.
  • Steel Lintels: Required for large sections of glazing, adding to expenses.
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Information on building your own home is for general purposes only and may not be accurate or up-to-date. Always consult with licensed professionals before making any decisions. We are not responsible for any errors or outcomes based on this content.

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