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BIM-MEPAUS SPECIFICATION
Ductwork lining and insulation wrap
Issued By: BIM-MEPAUS
30 Cromwell Street, Burwood 3205 VIC Australia
Revision: REV A
Date June 2016
BIM-MEPAUS Specification
Ductwork lining and insulation wrap
BIM-MEPAUS
June 2016
Acknowledgements BIM-MEPAUS acknowledges the contributions of those organisations involved in the development and review of this
specification including principal contributors:
A.G. Coombs Pty Ltd
CSR Building Products Ltd
D&E Air conditioning Pty Ltd
Ductmakers Pty Ltd
Fletcher Insulation Pty Ltd
Insulation Council of Australia and New Zealand
Kavanagh Industries Pty Ltd
Knauf Insulation Pty Ltd
Marshall Day Acoustics Pty Ltd
Norman Disney & Young Pty Ltd
Resonate Acoustics
Australian Chamber of Commerce and Industry
Formatting conventions The following table shows text formats used in BIM-MEPAUS documentation and their application:
Text Type Example Indicates
Italicized text BIM Execution Plan The generic title for a type of document
Bold italicised text BIM-MEPAUS Specification The name of a referenced document
Red bold text LOD First reference to a term or abbreviation that is
defined in the website glossary under Practices
Blue text www.bimmepaus.com.au Hyperlink / web link
Blue italicised text Explanatory notes Explanatory notes or reference information
Green bold text Future development Sections or documents that are still under
development by BIM-MEPAUS.
Keeping BIM-MEPAUS up-to-date BIM-MEPAUS specifications, templates and content are updated to reflect changes in legislation, technology and
industry practice. Feedback and suggestions are welcome and can be made via the BIM-MEPAUS website. Updates
are managed and delivered through the BIM-MEPAUS website.
Liability disclaimer BIM-MEPAUS makes no warranty, expressed or implied, including but not limited to any implied warranties of
merchantability and fitness for a particular purpose, nor assume any legal liability or responsibility for the accuracy,
completeness, or usefulness of the information in this document.
In no event shall BIM-MEPAUS or its agents be liable for damages or losses resulting from the use of, or reliance on
the information provided in this document.
COPYRIGHT © BIM-MEPAUS All rights reserved.
BIM-MEPAUS Specification
Ductwork lining and insulation wrap
BIM-MEPAUS
June 2016
Table of Contents
1 INTRODUCTION .............................................................................................................. 1
1.1 Scope ........................................................................................................................................................ 1
1.2 References ................................................................................................................................................ 1
1.3 Objectives .................................................................................................................................................. 1
2 MODEL WORKFLOW ...................................................................................................... 2
2.1 Model workflow .......................................................................................................................................... 2
2.2 Ductwork systems, services and specifications ......................................................................................... 3
2.3 Ductwork system schematics .................................................................................................................... 3
2.4 Design model ............................................................................................................................................ 3
2.5 Construction model .................................................................................................................................... 4
2.6 Commissioned As-Built model ................................................................................................................... 4
3 RELEVANT STANDARDS ............................................................................................... 5
4 DUCTWORK INSULATION SPECIFICATION .................................................................. 6
5 DUCTWORK LINING SPECIFICATION ........................................................................... 7
6 LINING AND INSULATION CODES ................................................................................. 9
6.1 General ...................................................................................................................................................... 9
6.2 Codes ........................................................................................................................................................ 9
6.3 Insulation wrap / lining scheduling ........................................................................................................... 11
7 DRAFTING STANDARDS ...............................................................................................12
BIM-MEPAUS Specification
Ductwork lining and insulation wrap
BIM-MEPAUS Page 1
June 2016
1 INTRODUCTION
1.1 Scope
This document sets out the BIM-MEPAUS specification for rigid ductwork linings and insulation wraps.
The specification addresses:
Ductwork internal acoustic and thermal insulation linings
Ductwork external insulation wraps.
Fire resistance systems including fire resistance wraps and sprays are nominated in the BIM-MEPAUS Ductwork
fire resistance paints, wraps and sprays specification.
1.2 References
This specification should be read in conjunction with the following specifications and documents:
BIM-MEPAUS Air handling system metal ductwork specification – this specification specifies the
requirements for rigid rectangular and round ductwork for air handling systems.
BIM-MEPAUS Ductwork fire resistance paints, wraps and sprays specification – this specification
specifies the requirements for fire resistance systems applied to ductwork.
BIM-MEPAUS Ducting systems, plant and equipment schedule – this Excel based schedule provides
the complete listing for all ductwork systems, plant and equipment names as well as the system colour
schema.
BIM-MEPAUS Master shared parameter schedule – this document provides the reference source for all
shared parameter names used within the BIM-MEPAUS IFM and MCM models – the Excel formatted
schedule also provides the Revit classification and GUID.
These documents can be accessed through the BIM-MEPAUS website.
1.3 Objectives
Benefits sought through the development and implementation of this specification include:
A structured approach to the specification and modelling of ductwork lining and insulation requirements;
Reliable and accurate Design-to-Fabrication workflows; and
Industry standardization delivering improved supply chain efficiency, reduced project costs and risks to the
client and project team.
BIM-MEPAUS Specification
Ductwork lining and insulation wrap
BIM-MEPAUS Page 2
June 2016
2 MODEL WORKFLOW
2.1 Model workflow
This standard supports the implementation of the Design to Commissioned As-Built workflow that sees the
progressive development of the MEP model through to an as-built model.
The BIM-MEPAUS constructible Revit template add-in is intended to support a wide range of design and
construction activities including system and engineering checks, construction planning, scheduling and BIM to Field
workflows.
BIM-MEPAUS design models nominate systems and ductwork services and will typically be modelled in native Revit
families that match to Revit Fabrication parts. Whilst not required to provide shop drawing level detailing, the
families are fully defined and constructible. Modelling using Revit Fabrication Parts is also permitted.
BIM-MEPAUS construction models provide construction level detailing using fabricator and manufacturer certified
content suitable for approval submissions. The ductwork component of the model will normally be modelled using
Revit Fabrication Parts. The model is intended to be read in conjunction with the duct fabricator’s manufacturing
specifications to determine code compliance.
BIM-MEPAUS Commissioned As-Built Models incorporating any field installation changes provide the basis for future
design and documentation of modifications to the installation and the ongoing management of accurate as-built
records through the building’s life cycle. All models would be based on use of Revit Fabrication Parts.
The standard supports the Design to Fabrication workflow that sees the Revit Construction Model converted to
either a Fabrication Model allowing the ductwork model to be further detailed for fabrication, pricing and site
installation and/or direct MAJ export for manufacture.
Commissioned As -
Built Model LOD 500
Design BIM Model
LOD 100 - 300
Construction Platform
BIM Model LOD 400
Commissioned As -
Built Model LOD 500 Design BIM Model
LOD 100 - 300 Construction Platform
BIM Model LOD 400
Fabrication ITM
Model – LOD 400
BIM-MEPAUS Specification
Ductwork lining and insulation wrap
BIM-MEPAUS Page 3
June 2016
2.2 Ductwork systems, services and specifications
A key feature of the BIM-MEPAUS approach to ductwork modelling is the use of defined ductwork systems,
services and specifications. This approach draws from the Autodesk Fabrication approach to modelling and is
important if the full potential of constructible Revit MEP modelling workflows are to be leveraged by designers and
constructors.
Systems define the type of reticulation system: Supply Air System, Smoke Spill System, Clean Air
System, etc.
Services set the applicable specification and routing preferences.
Specifications detail the fabrication standards for each ductwork, insulation and lining type.
In BIM-MEPAUS the system and service must be selected to model the system and nominate the required ducting,
insulation and lining specifications. The use of this modelling approach provides significant benefits for BIM based
system design together with downstream engineering validation, coordination, pricing and scheduling take-offs.
2.3 Ductwork system schematics
Ducting system design should begin with the system schematics, compartmentation and functional control
strategies. These are key to conveying the design intent and are also the starting point for the modelling of the
ductwork layouts.
Best practice air side schematics convey the system architecture and include:
Building compartmentation
Smoke and fire rated walls
Duct sizes and design flows
Monitoring and control strategies.
The BIM-MEPAUS template is not intended to generate the schematic from the design model.
2.4 Design model
The BIM-MEPAUS Revit® Template allows engineers and modellers to specify and design systems using
constructible ducting services and insulation and linings.
Design ducting service specifications are based on AS 4254-2012 and connect plant, equipment and fittings to form
complete systems. It is important that the ductwork and insulation be modelled by both system and service
specification if it is to be fully leveraged within the Design to Commissioned As-built workflow.
The use of BIM-MEPAUS constructible services allows a range of engineering checks and calculations to be
completed with greater accuracy. The aim is to support the following engineering tasks:
Design flow calculations
Estimation of design flow system pressure losses, and
Review of ducting system specification compliance.
BIM-MEPAUS Specification
Ductwork lining and insulation wrap
BIM-MEPAUS Page 4
June 2016
2.5 Construction model
The virtual build of the design model into the LOD 400 construction model generates a model that is suitable for
approval submissions and includes all ductwork systems fully designated in terms of system type, service and
specification.
The development of the design model to the LOD 400 construction model typically involves a number of tasks:
Breaking the ductwork into segment lengths
Value engineering to determine the most cost effective service and layout within specification
Changing-out of the design content with manufacturer’s certified content for end of line plant and
equipment such as fan coil units and fans
Checking option costs against original estimates and/or budget
Final services coordination and routing
System engineering checks and finalisation of pressure loss calculations and fan selections.
Once the construction model is finalized and required approvals received it is possible to convert the model to a Fabrication Model for:
Ductwork procurement scheduling
Detailed costing
Generation of CAM files for manufacture.
2.6 Commissioned As-Built model
The generation of the LOD 500 model from the approved LOD400 typically involves up-dating the model with BIM-
to Field information returned from the field.
BIM-MEPAUS Specification
Ductwork lining and insulation wrap
BIM-MEPAUS Page 5
June 2016
3 RELEVANT STANDARDS
There are a number of requirements in the National Construction Code that relate to ductwork lining and insulation
together with relevant Australian Standards.
Codes and standards referenced in this specification include:
General Requirements
NCC/ BCA : National Construction Code / Building Code of Australia
Ductwork
AS 4254.2 - 2012 : Ductwork for air-handling systems in buildings - Part 2: Rigid duct.
AS 1668.1 -2015 : The use of ventilation and air conditioning in buildings – Part 1: Fire and Smoke
Control in multi-compartment buildings
AS 1668.2 -2015 : The use of ventilation and air conditioning in buildings – Part 2: Mechanical
Ventilation in buildings
Insulation
AS 4426 – 1997 : Thermal Insulation of pipework, ductwork and equipment – Selection,
installation and finish
AS 4508 -1999 : Thermal resistance of insulation for ductwork used in building air conditioning.
AS/NZS 4859.1-2002 : Materials for the thermal insulation of buildings - General criteria and technical
provisions.
Testing
AS 1530.3-1999 : Methods of fire tests on building materials, components and structures -
Simultaneous determination of ignitability, flame propagation, heat release and
smoke release
AS 1530.4-2005 : Methods for fire tests on building materials, components and structures - Fire-
resistance test of elements of construction
AS/NZS 4859.1-2002 : Materials for the thermal insulation of buildings - General criteria and technical
provisions
UL 181-2005 : Factory-Made Air Ducts and Air Connectors.
BIM-MEPAUS Specification
Ductwork lining and insulation wrap
BIM-MEPAUS Page 6
June 2016
4 DUCTWORK INSULATION SPECIFICATION
Insulation applied to the external surface of the ductwork serves the following principal purposes:
reducing thermal energy gains or losses assuring system efficiency and uniform supply air temperature
across a system, and
minimization of condensation risk.
Deemed to satisfy minimum ductwork thermal insulation performance is nominated by the BCA with the required R
values determined by a combination of system type, climatic zone and ductwork location. For all zones, except
Alpine Zone 8, the insulation requirements within the BCA have been aligned as set out in Table 4.1.1.
Table 4.1.1 BCA Required Thermal R Ratings for insulation ratings (except Zone 8 – Alpine)
Ductwork Location R-Value
Within a conditioned space 1.2
All other locations within the building envelope 2.0
Where exposed to direct sunlight 3.0
The BCA also requires that ductwork insulation:
comply with the fire hazard properties set out in AS 4254 and AS1668.1, and
for cold air ductwork systems, incorporate a vapour barrier on the outside surface of the insulation.
Commentary
I. To meet these requirements, the majority of ductwork insulation wrap products are manufactured
from 18-24 kg/m3 glass wool with a foil facing providing the required vapour barrier.
II. The glass wool insulation wrap thickness required to achieve R1.2. is typically of the order of 38
to 40mm whilst for R2.0 the required thickness is generally 75mm.
III. Insulation wrap products are not suitable for ductwork exposed to weather or sunlight and hence
R3.0 insulation wrap is not typically available.
IV. Polyester wool provides an alternative product choice to glass wool with respect to the bulk
insulation material, however it is noted that this product typically has a lower thermal resistance
value and hence is typically thicker to achieve the required R value.
V. Stone wool (Rockwool ™) is a fully imported product and hence should not generally be specified
except for applications such as for boiler and heating water unit flues where the higher
temperature rating is required.
BIM-MEPAUS Specification
Ductwork lining and insulation wrap
BIM-MEPAUS Page 7
June 2016
5 DUCTWORK LINING SPECIFICATION
Ductwork linings are applied to the internal surface of the ductwork and are typically used where:
In-duct noise attenuation is required; and/or
Ductwork is exposed to view and/or the weather.
The use of internal lining impacts the ductwork fabrication to a significant extent and hence there is a need to
integrate the lining specification to the ductwork manufacturing fabrication specifications.
Deemed to satisfy ductwork lining thermal insulation values are nominated by the BCA with the required minimum
R values determined by the system type, climatic zone and ductwork location.
Table 5.1 BCA Deemed-to-satisfy thermal R ratings for internal linings (except for Zone 8 – Alpine)
Location R-Value
Within a conditioned space 1.2
All other locations within the building envelope 2.0
Where exposed to direct sunlight 3.0
The BCA also requires that ductwork insulation:
comply with the fire hazard properties set out in AS 4254 and AS1668.1, and
for cold air ductwork systems, incorporate a vapour barrier on the outside surface of the insulation.
Ductwork linings for smoke spill and kitchen exhaust systems and sub-ducts are also required to be faced with
perforated metal in order to comply with AS 1668.1.
The preferred basis of design for ductwork internal linings is 32kg/m3 glass wool. This product density provides
tested acoustic performance that meets the majority of project requirements.
The standard range of lining facings are:
Heavy Duty Perforated Foil – preferred for general acoustic applications
Continuous Acoustic Membrane – preferred where the surface is required to be cleaned
and/or high levels of fibre containment are required.
Representative products include:
• Acoustituff ™ (CSR - Bradford)
• VapaStop ™ (Fletcher Insulation)•
Perforated Metal with Continuous Acoustic
Membrane
preferred for trafficable ductwork, areas such with
high turbulence such as fan discharges and/or where
required for compliance with AS1668.1 smoke
exhaust and kitchen exhaust systems.
BIM-MEPAUS Specification
Ductwork lining and insulation wrap
BIM-MEPAUS Page 8
June 2016
There are a number of proprietary facings that may also be suitable for specific applications, including
Premium Acoustic Fabric ( such as CSR-Bradford Ultraphon ™ )
Bonded Matt Face.
It is noted that polyester or PET facings (common brands include Mylar™ and Melinex ™) have traditionally been
specified for clean room and kitchen exhaust systems and attenuators. The Continuous Acoustic Membranes
products however are generally considered to provide a more durable and cost effective facing for these
applications. Polyester film facing is still listed, however as a non-standard lining facing.
Further details in relation to the specifications for these facings can be accessed through ICANZ member
companies.
BIM-MEPAUS Specification
Ductwork lining and insulation wrap
BIM-MEPAUS Page 9
June 2016
6 LINING AND INSULATION CODES
6.1 General
BIM-MEPAUS ductwork linings and insulation specification codes are intended to meet the majority of project
requirements.
The BIM-MEPAUS coding system incorporates a number of default values that support product standardization and
compliance, whilst not limiting opportunities for innovation.
The following default values are noted within the coding system:
Ductwork Acoustic Linings
Standard glass wool density for internal linings: 32kg/m3
Standard internal lining thicknesses: 50mm, 75mm and 100mm for R1.2, R2.0 and
R3.0 respectively.
Ductwork External Insulation Wraps
Standard glass wool density for external linings: 22kg.
Standard external insulation wrap thicknesses: 38-40mm and 75mm for R1.2 and R2.0
respectively
Standard facing: Medium or heavy duty foil.
Where a non-default insulation density or thickness are required - these appear as suffix codes.
6.2 Codes
The BIM-MEPAUS codes are as follows
Table 6.2.1 Lining / Insulation type codes
Lining/Insulation wrap Type Code
External insulation wrap E
Internal acoustic liner I
Table 6.2.2 Lining / Insulation material type codes
Insulation material Code
Glass wool GW
Polyester wool PW
Stone wool SW
BIM-MEPAUS Specification
Ductwork lining and insulation wrap
BIM-MEPAUS Page 10
June 2016
Table 6.2.3 Lining / Insulation material density codes
Density kg/m3 Code
18 18
22 22*
24 24
32 32*
48 48
Default Values: External insulation – 22kg/m3
Internal Lining – 32kg/m3
Table 6.2.4 Facing type codes
Standard facing Facing Code
Heavy Duty Perforated Foil HDP
Continuous Acoustic Membrane CAM
Perforated Metal / CAM PMC
Premium Acoustic Fabric PAF
Bonded Matt Face BMF
Non standard facing Facing Code
Polyester Film PET
Table 6.2.5 Lining thermal resistance codes and thicknesses
Deemed to satisfy lining thermal
resistance K·m2/W
Code Nominal
thickness mm
1.2 R1.2 50
2.0 R2.0 75
3.0 R3.0 100
BIM-MEPAUS Specification
Ductwork lining and insulation wrap
BIM-MEPAUS Page 11
June 2016
Non-standard performance based
lining thermal resistance K·m2/W
Code Nominal thickness
mm
0.7 R0.7 25
Table 6.2.6 Insulation wrap resistance codes and thicknesses
Deemed to satisfy insulation wrap
thermal resistance K·m2/W
Code Nominal thickness
mm
1.2 R1.2 40
2.0 R2.0 75
Non-standard performance based
insulation wrap thermal
resistance K·m2/W
Code Nominal thickness
mm
0.7 R0.7 25
6.3 Insulation wrap / lining scheduling
The insulation wrap /lining scheduling syntax is as follows:
INSULATION/LINING – <MATERIAL TYPE> <DENSITY> <THERMAL RESISTANCE> <FACING TYPE>.
The following points are noted about the schema:
Where the default material densities are required – the density parameter is not need listed.
The material R value is used in lieu of the material thickness, this nominates the performance requirement
and with the industry standardized corresponding material lining thicknesses therefore the lining thickness.
The following provides representative examples of scheduling syntax and codes for a number of industry standard
insulation and lining services.
E-PWR1.2FF External insulation wrap comprising 38-40mm thick 22kg/m3 polyester wool
providing a material R value of 1.2 K·m2/W and faced with foil
I-GWR1.2CAM Acoustic internal lining comprising 50mm thick 32kg/m3 glass wool faced
providing a material R value of 1.2 K·m2/W and faced with continuous
acoustic membrane.
A representative example of scheduling code for a non-standard insulation and lining service is as follows.
I-GW48R1.2HDP Special order acoustic internal lining comprising 50mm thick 48kg/m3 glass
wool providing an overall R value of 1.2 K·m2/W and faced with heavy duty
perforated foil.
BIM-MEPAUS Specification
Ductwork lining and insulation wrap
BIM-MEPAUS Page 12
June 2016
7 MODEL VISUALISATION
The BIM-MEPAUS Template Add-In provides standard representations for internal linings and insulation wraps that
combine established design and shop drawing practices to enable clear indication of the requirements at all points
through the design to as-built workflow.
The hatching type indicates the type of insulation wrap or lining as follows:
External Insulation Wrap – single hatch
Internal Lining with non-perforated metal facing
Internal Lining with perforated metal facing
Differentiation of the perforated metal facing has been provided due to the significant impact that this facing has
with respect to ductwork manufacture and cost.