Template for report - Welcome to BIM-MEPAUS · PDF fileThis document sets out the BIM-MEPAUS specification for rigid ductwork linings and insulation wraps. ... Design BIM Model Commissioned

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


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.

http://www.bimmepaus.com.au/



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



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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.



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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



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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.



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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.



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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.

http://www.saiglobal.com/online/Script/Details.asp?DocN=AS967019572144

http://www.saiglobal.com/online/Script/Details.asp?DocN=AS967019572144



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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.



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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.



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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.



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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



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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



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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


mm

1.2 R1.2 40

2.0 R2.0 75

Non-standard performance based

insulation wrap thermal

resistance K·m2/W


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.



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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.

Documents

Template for report - Welcome to BIM-MEPAUS · PDF fileThis document sets out the BIM-MEPAUS specification for rigid ductwork linings and insulation wraps. ... Design BIM Model Commissioned