Roof Design (RD) - Reference List - Roof Design Terminology - Materials - Job Types - Roof Features - Trusses/Frames

Oct 28, 2026

Roof Design (RD) reference list organizing core guidance for pitched and related roof structures. It covers terminology (roof, trusses), materials (timber, plywood, fixings, restraint straps), job types (estimating and manufacture), and roof features (gables, hips, dormers, towers). The catalog further details framing approaches, truss and frame selection, design-for-manufacture/transport/erection considerations, bracing and engineering principles (loading, deflection, fixity), plus maths, girder connections, remedial works, lifted roofs, and fire-related test data.

LanguageEnglish

CategoryTechnology

FormatPDF

Pages5

Reading Time13 min

AccessFree to download

RD.1 Terminology

RD.2 Materials

RD.3 Job Types

RD.4 Roof Features

RD.5 Trusses/Frames

RD.6 Things to Consider

RD.7 Design for Manufacture

RD.8 Design for Transport

RD.9 Design for Erection

RD.10 Design Responsibilities

RD.11 Bracing

RD.12 Engineering Principles

RD.13 Maths

RD.14 Girder Connections

RD.15 Remedial Works

RD.16 Lifted Roofs

RD.17 Fire

Roof Design (RD) | Reference | Description | | --- | --- | | RD.1 | TERMINOLOGY | | RD.1.1 | Roof | | RD.1.2 | Trusses | | RD.1.3 | Intro to Trusses Powerpoint | | RD.2 | MATERIALS | | --- | --- | | RD.2.1 | Timber | | RD.2.2.1 | Nail Plates-General | | RD.2.2.2 | Nail Plates-Use in Corrosive Environments | | RD.2.2.3 | Nail Plates-Gaps Beneath Plates | | RD.2.2.4 | Nail Plates-Field Splice Plates | | RD.2.3 | Posi-Strut | | RD.2.4.1 | Roof Finishes-Tiles | | RD.2.4.2 | Roof Finishes-Flat Roof | | RD.2.4.3 | Roof Finishes-Warm Roofs | | RD.2.5.1 | Hangers-Hanger Types | | RD.2.5.2 | Hangers-Manual Design | | RD.2.5.3 | Hangers-Bearing Lengths | | RD.2.5.4 | Hangers-Pamir Fabricator Settings | | RD.2.5.5 | Hangers-Rotated Hangers in Roof Applications (ITW Cullen) | | RD.2.6 | Plywood | | RD.2.7 | Fixings | | RD.2.8 | Restraint Straps | | RD.2.9 | Other | | RD.3 | JOB TYPES | | --- | --- | | RD.3.1 | Estimating | | RD.3.2 | Manufacture | | RD.4 | ROOF FEATURES | | --- | --- | | RD.4.1 | Gable | | RD.4.2 | Hip | | RD.4.3 | T Intersection | | RD.4.4 | Attic | | RD.4.5 | Raised Tie | | RD.4.5.1 | Raising the Roof | | RD.4.6 | Dog leg corner | | RD.4.7 | Openings | | RD.4.7.1 | Openings-Roof Light Tolerances | | RD.4.7.2 | Openings-Framing at Roof Lights | | RD.4.8 | Dormers | | RD.4.9 | Towers/Turrets | | RD.4.10 | A Guide to Roof Surfaces | | RD.5 | TRUSSES/FRAMES | | --- | --- | | RD.5.1 | Ways to Frame | | RD.5.2 | Trusses or Infill | | RD.5.3 | Where to use Girders | | RD.5.4 | Gable Ladders | | RD.5.4.1 | Gable Ladders-Non structural Items in Pamir | | RD.5.5 | Web Selection | | RD.5.6 | Cut Trusses-Attics | | RD.5.7 | Feature Trusses | | RD.5.8 | Valley Trusses | | RD.5.9 | Reinforcement / Scabs | | RD.5.10.1 | Multi-Part Trusses-Field Splice Plate | | RD.5.10.2 | Multi-Part Trusses-Pole Plate / Lapped | | RD.5.11 | Attic Trusses-Non-standard support details | | RD.6 | THINGS TO CONSIDER | | --- | --- | | RD.6.1 | Match Existing | | RD.6.2 | Drawing Scales | | RD.6.3 | Future Use | | RD.6.4 | Eaves Details | | RD.6.5 | GRP Dormers | | RD.6.6 | Minimum Timber Sizes | | RD.6.6.1 | Maximum Truss Spans | | RD.6.7 | Centres | | RD.6.8.1 | Large Projections-Gables | | RD.6.8.2 | Large Projections-Eaves | | RD.6.8.3 | Large Projections-Hip | | RD.6.9.1 | Ceiling Construction-Suspended Ceiling | | RD.6.9.2 | Ceiling Construction-Exposed Ceiling | | RD.6.10 | Design Principles-Span to Depth Ratio | | RD.6.11 | Design Principles-External Wall Members Designed as Trusses | | RD.6.12 | Design Principles-Infill Rafters carrying ceiling finishes | | RD.7 | DESIGN FOR MANUFACTURE | | --- | --- | | RD.7.1 | Match Groups | | RD.7.2 | Economy | | RD.8 | DESIGN FOR TRANSPORT | | --- | --- | | RD.8.1 | Height Restriction | | RD.8.2 | Length Restriction | | RD.9 | DESIGN FOR ERECTION | | --- | --- | | RD.10 | DESIGN RESPONSIBILITIES | | RD.11 | BRACING | | --- | --- | | RD.11.1 | Responsibilities | | RD.11.2 | Wall Bracing | | RD.11.3 | Stability Bracing | | RD.11.3.1 | T-Braces | | RD.11.4 | Out-of-plane Restraint | | RD.11.5 | Wind Girders | | RD.11.6 | Wind Posts | | RD.11.7 | Ply/OSB Bracing | | RD.11.8 | Cantilevers/Stubs | | RD.11.9 | Attic Strutting | | RD.11.10 | Stress Reversal | | RD.11.11 | PD6693-1-Wall Plate Connections | | RD.12 | ENGINEERING PRINCIPLES | | --- | --- | | RD.12.1 | CSI | | RD.12.2 | Moment | | RD.12.3 | Tension / Compression | | RD.12.4 | EC5 Vibration checking | | RD.12.5 | Support Fixity | | RD.12.6 | Other | | RD.12.7.1 | Deflection-Horizontal | | RD.12.7.2 | Deflection-Compound | | RD.12.7.3 | Deflection-Differential | | RD.12.7.4 | Deflection-14mm Limit for Attic Trusses | | RD.12.7.5 | Deflection-Deflectons in Pamir | | RD.12.8.1 | Loading-Types | | RD.12.8.2 | Loading-Duration | | RD.12.8.3 | Loading-Actions | | RD.12.8.4 | Loading-Load Paths | | RD.12.8.5 | Loading-Site Location | | RD.12.8.6.1 | Loading-Snow Drift | | RD.12.8.6.2 | Loading-Snow Drift-Spreadsheet | | RD.12.7.1 | Loading

FAQs

What major topic areas are included in the Roof Design (RD) reference list?

It organizes content across terminology, materials, job types, roof features, trusses/frames, key considerations, and multiple design stages such as manufacture, transport, and erection. It also includes bracing, engineering principles, maths, connections, remedial works, lifted roofs, and fire-related items.

Which materials and components are listed under RD.2 Materials?

The materials section includes timber, nail plates (including corrosion-related use and gap considerations), Posi-Strut, roof finishes (tiles, flat roofs, warm roofs), hangers (types, manual design, bearing lengths), plywood, fixings, restraint straps, and an RD.2.9 Other bucket.

How does the document approach structural design under engineering principles and bracing?

It separates guidance into bracing responsibilities and categories (wall bracing, stability bracing, wind girders/posts, ply/OSB bracing, and attic strutting) and engineering principles such as moment, tension/compression, vibration checking, support fixity, and deflection limits. It also outlines loading categories, durations, load paths, wind effects, snow drift, and special loads.

Oct 28, 2026

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