ISO/TR 25080

Wood and wood-based products — Background and examples of calculating contributions to carbon stored in harvested wood products (HWP)

Bois et produits à base de bois — Contexte et exemples de calcul des contributions au carbone stocké dans les produits ligneux récoltés (PLR)

General Information

• Status: Not Published
• ICS: 79.040 - Wood, sawlogs and sawn timber
• ICS: 79.060.01 - Wood-based panels in general
• Technical Committee: ISO/TC 287 - Sustainable processes for wood and wood-based products
• Drafting Committee: ISO/TC 287/WG 3 - Sustainability aspects
• Current Stage: 6000 - International Standard under publication
• Start Date: 25-Apr-2025
• Completion Date: 26-Apr-2025

Standards Content (Sample)

FINAL DRAFT
Technical
Report
ISO/DTR 25080
ISO/TC 287
Wood and wood-based products —
Secretariat: ABNT
Background and examples of
Voting begins on:
calculating contributions to carbon
2025-02-27
stored in harvested wood products
Voting terminates on:
(HWP)
2025-04-24
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
Reference number
ISO/DTR 25080:2025(en) © ISO 2025

FINAL DRAFT
ISO/DTR 25080:2025(en)
Technical
Report
ISO/DTR 25080
ISO/TC 287
Wood and wood-based products —
Secretariat: ABNT
Background and examples of
Voting begins on:
calculating contributions to
carbon stored in harvested wood
Voting terminates on:
products (HWP)
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
© ISO 2025
IN ADDITION TO THEIR EVALUATION AS
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
or ISO’s member body in the country of the requester.
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland Reference number
ISO/DTR 25080:2025(en) © ISO 2025

ii
ISO/DTR 25080:2025(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 The harvested wood product coefficient (HWP coefficient) concept . 1
5 Background and options provided by IPCC Guidelines and their applicability for
reporting at an organizational level . 2
5.1 General .2
5.2 HWP approaches to estimate greenhouse gas dynamics .2
5.2.1 Approaches .2
5.2.2 Estimating greenhouse gas dynamics based on carbon stock changes .3
5.2.3 Estimating greenhouse gas dynamics based on greenhouse gas fluxes to the
atmosphere .4
5.3 HWP methods to estimate greenhouse gas dynamics .5
5.4 IPCC tiers 2 and 3 calculations .7
6 Tier 1 calculations . 7
6.1 General .7
6.2 First order decay in IPCC tier 1 .7
6.3 Data requirements to calculate HWP coefficients in ISO 13391-1 .8
6.4 Using HWP coefficients in the first order decay model in ISO 13391-1 .9
6.5 Tier 1 HWP coefficients .11
7 Calculation of HWP contribution under tiers 2 and 3 .12
7.1 General . 12
7.2 Recycling rates and market growth . 12
7.3 HWP coefficient for roundwood .14
7.4 Product residence time . 15
7.4.1 IPCC country-specific half-lives . 15
7.4.2 Refining the IPCC country-specific half-life at an organizational level . 15
7.4.3 Altering the function used to model residence time .16
7.4.4 Tier 3 calculation of HWP contribution .16
7.4.5 Considerations based on IPCC guidelines .16
8 Data availability/Literature review . 17
9 Examples of methods for calculating HWP coefficients .18
9.1 Assumptions .18
9.2 Example 1: Using national inventory reports and country-level statistics on wood-
based products .19
9.3 Example 2: Using market development data .21
9.4 Using organization-specific data . 23
9.5 Note on sensitivity related to assumptions and limitations in the examples . 23
10 HWPs in landfill and other methods of woody carbon storage .24
10.1 General .24
10.2 Tier 1 approach for landfill carbon storage .24
10.3 Considering non-standard landfills . 25
10.4 Tier 2 methods for material entering landfill using half-life . 25
10.4.1 General . 25
10.4.2 Recycling . 26
10.4.3 Burning for energy . 26
10.4.4 Landfilling .27
Bibliography .30

iii
ISO/DTR 25080:2025(en)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
ISO technical committees. Each member body interested in a subject for which a technical committee
has been established has the right to be represented on that committee. International organizations,
governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely
with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 287, Sustainable processes for wood and wood-
based products.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.

iv
ISO/DTR 25080:2025(en)
Introduction
ISO 13391-1 defines a framework for calculating greenhouse gas dynamics of wood and wood-based
products. The framework identifies a component for wood-based carbon (i.e. biogenic carbon stored in
wood-based products), representing the contributions to the harvested wood products (HWP) pool and
wood-based carbon storage in landfills or through biogenic carbon capture and storage (bio-CCS), see
Figure 1. ISO 13391-1 further elaborates on the calculation of these contributions based on the delivery of a
set of wood and wood-based products in a specified time period at an organizational or aggregate level. This
document provides additional background and examples to users of ISO 13391-1.
ISO 13391-1 introduces the concept of a HWP coefficient t
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ISO/TC 287
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Secretariat: ABNT
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Wood and wood-based products – — Background and examples of
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calculating contributions to carbon stored in harvested wood
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ISO/DTR 25080:(en)
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All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication
may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying,
or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO
at the address below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: + 41 22 749 01 11
Formatted: French (France)
EmailE-mail: [e-mail]
Formatted: French (France)
Website: www.iso.orgwww.iso.org
Formatted: French (France)
Published in Switzerland
Formatted: Font: 10 pt
Formatted: Font: 10 pt
Formatted: Font: 11 pt
Formatted: FooterPageRomanNumber, Space After: 0
pt, Line spacing: single
ii © ISO #### 2025 – All rights reserved
ii
ISO/DTR 25080:2025(:(en)
Formatted: Font: Bold
Formatted: Font: Bold
Formatted: HeaderCentered, Left
Contents
Formatted: Adjust space between Latin and Asian text,
Adjust space between Asian text and numbers
Foreword . v
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 The harvested wood product coefficient (HWP coefficient) concept . 1
5 Background and options provided by IPCC Guidelines and their applicability for
reporting at an organizational level . 2
5.1 General. 2
5.2 HWP approaches to estimate greenhouse gas dynamics . 2
5.3 HWP methods to estimate greenhouse gas dynamics . 6
5.4 IPCC tiers 2 and 3 calculations . 8
6 Tier 1 calculations . 8
6.1 General. 8
6.2 First order decay in IPCC tier 1 . 8
6.3 Data requirements to calculate HWP coefficients in ISO 13391-1 . 9
6.4 Using HWP coefficients in the first order decay model in ISO 13391-1 . 11
6.5 Tier 1 HWP coefficients . 12
7 Calculation of HWP contribution under tiers 2 and 3 . 13
7.1 General. 13
7.2 Recycling rates and market growth . 13
7.3 HWP coefficient for roundwood . 15
7.4 Product residence time . 16
8 Data availability/Literature review . 19
9 Examples of methods for calculating HWP coefficients . 20
9.1 Assumptions . 20
9.2 Example 1: Using national inventory reports and country-level statistics on wood-based
products . 21
9.3 Example 2: Using market development data . 23
9.4 Using organization-specific data . 26
9.5 Note on sensitivity related to assumptions and limitations in the examples . 26
10 HWPs in landfill and other methods of woody carbon storage . 27
10.1 General. 27
10.2 Tier 1 approach for landfill carbon storage . 27
10.3 Considering non-standard landfills . 28
10.4 Tier 2 methods for material entering landfill using half-life . 29
Bibliography . 34

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Foreword . v
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Introduction . vi
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1 Scope . 1
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2 Normative references . 1
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3 Terms and definitions . 1
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© ISO 2025 – All rights reserved
iii
ISO/DTR 25080:(en)
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4 Background and options provided by IPCC Guidelines and their applicability for
reporting at an organisational level . 1
4.1 General. 2
4.2 HWP approaches to estimate greenhouse gas dynamics . 2
4.2.1 Approaches . 2
4.2.2 Estimating greenhouse gas dynamics based on carbon stock changes . 3
4.2.3 Estimating greenhouse gas dynamics based on greenhouse gas fluxes to the atmosphere 5
4.3 HWP methods to estimate greenhouse gas dynamics . 6
5 Tier 1 – First-order decay method . 8
5.1 IPCC tier 1 . 8
5.2 Data requirements to determine HWP coefficients in ISO 13391-1 . Fel! Bokmärket är inte
definierat.
5.3 Using HWP coefficients in the first order decay model in ISO 13391-1 . 10
5.4 Examples of HWP coefficients (tier 1) . 12
6 Calculation of HWP coefficients based on market developments and modelling . 13
6.1 General. 13
6.2 Recycling rates and market growth . 13
6.3 HWP coefficient for roundwood . 16
7 Tier 2 and tier 3 methods . Fel! Bokmärket är inte definierat.
7.1 General. Fel! Bokmärket är inte definierat.
7.2 Refining the half-life in tier 2 and 3 first-order decay methods . 16
7.2.1 IPCC tier 2 and 3 country-specific half-lives . 16
7.2.2 Refining the tier 2 half-life at an organisational level . 17
7.3 Other tier 3 methods - Altering the function used to model residence time . 17
7.3.1 Selection of the function . Fel! Bokmärket är inte definierat.
7.3.2 IPCC tier 3 mathematical functions . 18
7.4 Tier 3 at an organizational level . Fel! Bokmärket är inte definierat.
7.5 Data availability/Literature Review . 19
8 Examples of methods for calculating HWP coefficients . 20
8.1 Assumptions . 20
8.2 Example 1: Using national inventory reports and country-level statistics on wood-based
products . 21
8.3 Example 2: Using market development data . 23
8.4 Example 3: Using organisation-specific data . 25
8.5 Note on sensitivity related to assumptions and limitations in the examples . 26
9 HWPs in landfill and other methods of woody carbon storage . 26
9.1 General. 26
9.2 Tier 1 approach for landfill carbon storage . 26
9.3 Considering non-standard landfills . 27
9.4 Tier 2 methods for material entering landfill using half-life . 27
9.4.1 General.
...