Pryda Specification Guide for Floor and Rafter Truss Systems - April 2012

Oct 24, 2026

Pryda’s specification guide for floor truss and rafter truss systems presents an installation- and design-focused reference covering system introductions, product benefits, and the key engineering considerations required for safe performance. It details design assumptions and load types, including dead loads, live loads, wind actions, guidance on other loads, and methods for computing wall and roof loads on floor trusses. The guide further covers performance factors, durability topics such as ventilation and corrosion protection, and extensive construction detailing across walls, beams, cantilevers, openings, stair and duct coordination, stability, bracing, and fixing at supports.

LanguageEnglish

CategoryResearch & Report

FormatPDF

Pages48

Reading Time2 h 1 min

AccessFree to download

Pryda Floor Truss System

Introduction

Pryda Longreach Trusses

Pryda Span Trusses

Frequently Asked Questions and Answers

Product Beneﬁts

Design Beneﬁts

Construction Beneﬁts

Design Considerations

General Information

Permanent Actions (Dead Loads)

Imposed Actions (Live Loads)

Computing Wall and Roof Loads on Floor Trusses

Guidance on Other Loads

Factors Affecting Floor Performance

Truss Orientation

Flooring Material

Strong-Backs

Bearing

Supporting Beams

No Ceiling Underneath Trusses

Serviceability

Fire and Sound Resistance

Durability

Sub-Floor Ventilation

Corrosion Protection

Protection of Exposed Cantilever Areas

Detail

End Types

Internal and External Wall Details

Cantilevers

Strong-Backs

Stability

Installation

Pryda Rafter Truss System

Introduction

Purlin Trusses

Rafter Trusses

Product Beneﬁts

Design Considerations

Pryda’s Speciﬁcation Guide for Floor and Rafter Truss Systems April 2012 [www.pryda.com.au](www.pryda.com.au) | Pryda Floor Truss System
Introduction............................................................................... 6
Pryda Longreach Trusses......................................................... 6
Pryda Span Trusses ................................................................. 6
Frequently Asked Questions and Answers ............................ 7
Product Beneﬁts
Net Installed Cost Beneﬁt......................................................... 8
Design Beneﬁts........................................................................ 9
Construction Beneﬁts............................................................. 10
Design Considerations
General Information................................................................ 11
Permanent Actions (Dead Loads)........................................... 11
Imposed Actions (Live Loads) ................................................ 11
Computing Wall and Roof Loads on Floor Trusses ................. 12
Guidance on Other Loads...................................................... 12
Factors Affecting Floor Performance
Truss Orientation.................................................................... 13
Flooring Material .................................................................... 13
Strong-Backs......................................................................... 13
Bearing .................................................................................. 13
Supporting Beams ................................................................. 13
No Ceiling Underneath Trusses .............................................. 13
Serviceability........................................................................... 14
Fire and Sound Resistance.................................................... 14
Durability
Sub-Floor Ventilation .............................................................. 14
Corrosion Protection .............................................................. 14
Protection of Exposed Cantilever Areas.................................. 14
Detail
End Types.............................................................................. 15
Internal Walls
Internal Non Load-Bearing Walls – Over Floor Truss ........... 19
Internal Non Load-Bearing Walls – Under Floor Truss ......... 20
Internal Non Load-Bearing Bracing Walls – Under .............. 20
Load Bearing Walls – Under Floor Truss ............................. 20
External Walls
Fully Supported End Truss.................................................. 21
End Truss Under Gable Roof.............................................. 21
End Truss Carrying Roof Loads Over.................................. 21
Offset Load-Bearing Walls .................................................. 21
Support of Concentrated Loads ......................................... 21
Floor Openings................................................................... 22
Beam Pocket Detail............................................................ 22
Block Detail ........................................................................ 22
Stairway Parallel to Trusses ................................................ 23
Stairway Perpendicular to Trusses ...................................... 23
Floor Set Down ...................................................................... 24
Ducts for Mechanical Services ............................................... 24
Cantilevers
Internal Cantilever............................................................... 25
External Cantilever (Balconies)............................................ 25
Cantilevered Support Off-Set Walls..................................... 26
Outrigger Support of Off-Set Walls ..........................

FAQs

What load types are addressed for Pryda floor truss design considerations?

The guide covers permanent actions (dead loads), imposed actions (live loads), and also includes guidance for computing wall and roof loads on floor trusses. It further provides advice on other loads and, for the rafter system, wind actions (wind loads).

Which factors affecting floor performance are discussed?

Key factors include truss orientation, flooring material, strong-backs, bearing, supporting beams, and the impact of having no ceiling underneath trusses. Serviceability items such as deflection limits, fire and sound resistance are also included.

What durability and corrosion protection measures does the guide include?

Durability coverage includes sub-floor ventilation, corrosion protection, and protection of exposed cantilever areas. These sections support long-term performance of the floor and rafter truss assemblies.

Oct 24, 2026

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