ISO 7567:2024

International
Standard
ISO 7567
First edition
Bamboo structures — Glued
2024-10
laminated bamboo — Product
specifications
Structures en bambou — Bambou lamellé-collé — Spécifications
du produit
Reference number
© ISO 2024
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Published in Switzerland
ii
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols . 3
5 Component requirements . 3
5.1 Bamboo strip requirements .3
5.1.1 Appearance .3
5.1.2 Maturity .3
5.1.3 Density .4
5.2 Adhesives .4
6 Performance requirements . . 4
6.1 Extension joints in laminations .4
6.1.1 Moisture content of bamboo strips .4
6.1.2 Extension joints geometry .4
6.1.3 Extension joint surface and adhesive application .4
6.2 Glue line integrity and strength .5
6.3 Property requirements .6
7 Manufacturing requirements . 6
7.1 General .6
7.2 Adhesives .6
7.3 Bamboo .6
8 Factory production internal quality control . 7
8.1 General .7
8.2 Glue line integrity .7
8.3 Gluing record .7
Annex A (normative) Shear performance test . 8
Annex B (informative) Personnel, facilities, manufacture, and quality control .11
Annex C (informative) Formaldehyde emission . 14
Annex D (informative) Examples of extension joints .15
Bibliography .16

iii
Foreword
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iv
Introduction
Glued laminated bamboo is produced by bonding together bamboo strips with their fibres parallel to each
other. A member with a rectangular or non-rectangular solid cross-section can be produced through this
manufacturing process.
The purpose of the requirements in this document is to provide minimum product specifications to achieve
adequate in-service performance of glued laminated bamboo building structures.
Figure 1 shows the typical manufacturing steps of glued laminated bamboo. Figure 1 a) shows a single
bamboo strip (also known as ‘lamina’) with rectangular cross section (w × t × l as shown in Figure 1 a)
s s s
which is typically lengthened by adding bamboo strips using non-structural joints (see 6.1). Figure 1 b)
shows a multiple layered glued laminated bamboo “board” (having width w and height h) component that
s
results from bonding together bamboo strips. The boards are subsequently assembled into glued laminated
bamboo components (having width b and height h) as shown in Figure 1 c) and Figures 1 d). The layup shown
in Figure 1 c) is the commonly used glued laminated bamboo arrangement. Other arrangements permitted
by this document are shown in Figures 1 d).
When producing multiple-board glued laminated bamboo, care shall be taken that the extension joints in
adjacent boards are staggered by at least the greater of 10w and 2h (see Figure 2).
s
a)  Single bam- d)  Other way to form
c)  Several bamboo
boo strip, the a solid glued laminated
strips are pressed both
basic compo- b)  Several bamboo
vertically and laterally
nent of glued bamboo strips
to form a solid glued
laminated are vertically
laminated bamboo
bamboo pressed
Key
1 extension joint
Figure 1 — Key manufacturing process for the products covered by this document
Figure 2 — Requirement for the staggering of extension joints in adjacent boards in the longitudinal
direction
v
vi
International Standard ISO 7567:2024(en)
Bamboo structures — Glued laminated bamboo — Product
specifications
1 Scope
This document specifies requirements for the components of glued laminated bamboo members intended
for structural use.
Although currently most glued laminated bamboo is made from Phyllostachys edulis (Moso), this document
also applies to other bamboo species (e.g. Guadua angustifolia, Dendrocalamus asper) if the performance
required by this document can be shown to have been achieved.
The basic requirements apply to structural members of all service classes; however, special precautions are
necessary for service class 3, for example, the use of weather resistant adhesives (see 5.2).
Annex C contains informative references for formaldehyde emission.
The requirements will need to be supplemented to take into consideration any relevant special conditions as
well as material and/or functional requirements.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO 12579, Timber structures — Glued laminated timber — Method of test for shear strength of glue lines
ISO 12580, Timber structures — Glued laminated timber — Methods of test for glue-line delamination
ISO 20152-1, Timber structures — Bond performance of adhesives — Part 1: Basic requirements
ISO 21625, Vocabulary related to bamboo and bamboo products
ISO 23478, Bamboo structures — Engineered bamboo products — Test methods for determination of physical
and mechanical properties
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 21625 and the following apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
bamboo failure percentage
at the plane of shear failure, the ratio of failed bamboo material to the total failure surface expressed as a
percentage
3.2
total delamination
sum of delamination lengths of all glue lines around the perimeter of a test piece
3.3
lamination
piece or pieces of bamboo, with or without extension joints forming part of a glued laminated bamboo product
3.4
service class
group designation characterized by the moisture content of the members corresponding to the temperature
and relative humidity of the surrounding air
3.4.1
service class 1
characterised by an equilibrium moisture content in the glued laminated bamboo not exceeding 12 %
Note 1 to entry: Service class 1 is representative of indoor air-conditioned or heated environments in which relative
humidity is maintained below 65 %.
3.4.2
service class 2
characterised by an equilibrium moisture content in the glued laminated bamboo not exceeding 20 %
Note 1 to entry: Service class 2 is representative of indoor unheated or uncooled environments in most locations
except those with relative humidity regularly or for prolonged periods exceeding 85 %.
3.4.3
service class 3
characterised by ambient or climatic conditions leading to moisture contents in glued laminated bamboo
higher than service class 2 (3.4.2), such as when a member is fully exposed to the weather
3.5
characteristic value
value of a material or product property having a prescribed probability of non-exceedance in a hypothetical
unlimited test series
Note 1 to entry: The value is expressed in terms of a specified fractile of the assumed statistical distribution of the
property expressed with a specified confidence.
3.6
density
characteristic mean density obtained at 75 % confidence limit determined at conditions of equilibrium
moisture content of 12 %
3.7
modulus of elasticity
characteristic mean modulus at a 75 % confidence limit obtained from the results of tests using test
specimens at an equilibrium moisture content resulting from a temperature of 20 °C and an equilibrium
moisture content of 12 %
3.8
strength
modulus of rupture
ultimate strength of beam element tested in flexure determined by first occurrence of tensile rupture or
compression failure of extreme fibres
th
Note 1 to entry: Expressed as a characteristic 5 -percentile value at a 75 % confidence limit.
3.9
moisture content
portion of material weight consisting of water expressed as percentage of oven-dry weight

4 Symbols
w
width for the cross-section of the bamboo strip
s
t
thickness for the cross-section of the bamboo strip
s
l
length of the bamboo strip
s
f
shear strength, newtons per square millimetre
v
A area, in square millimetres
b width of cross section, in millimetres
G shear modulus, in newtons per square millimetre
h depth of section, in millimetres
ρ density, in grams per cubic centimetre
f characteristic value of bending strength
m, k
f characteristic value of compressive strength parallel to grain, newtons per square millimetre
c, k
f characteristic value of tensile strength parallel to grain, newtons per square millimetre
t, k
f characteristic value of shear strength parallel to grain, newtons per square millimetre
v, k
f characteristic value of shear strength perpendicular to grain, newtons per square millimetre
c, 90, k
E modulus of elasticity, newtons per square millimetre
5 Component requirements
5.1 Bamboo strip requirements
5.1.1 Appearance
Bamboo culms shall be selected to permit the fabrication of straight bamboo splits. The length of bamboo splits
shall be adequate to make bamboo strips at least 2 000 ± 3 mm in length and at least 16 ± 0,1 mm in width.
The material used for glued laminated bamboo shall be free from physical damage, decay, and insect attack.
There may be variations from element to element, but the total impression of the glued laminated bamboo
shall show a homogeneous character.
NOTE Since bamboo is a natural material, colour variations can occur naturally or due to exposure to light over time.
Any part of the material, such as the bamboo outer layer (outer skin) or the bamboo inner layer (inner skin)
that hinders preservation, bonding, and finishing shall be removed entirely.
Splinters, cracks, and gaps within a single strip are not permitted.
5.1.2 Maturity
Bamboo shall be used and harvested at species-specific optimal maturity.
NOTE for most suitable species, optimal maturity is in the range of (4 to 7) years.

5.1.3 Density
The dry density of the bamboo strip shall be greater than 0,50 g/cm
.
5.2 Adhesives
Adhesives shall meet the requirements of ISO 20152-1. Adhesives containing formaldehyde require special
consideration as described in Annex C.
NOTE Additional requirements for adhesives can be specified by national standards or governing codes.
The adhesive shall enable joints such that the strength, durability and integrity of the bond is maintained
throughout the intended lifetime of the structure.
The adhesive shall be chosen considering the conditions during fabrication and in-service including climate,
moisture conditions, exposure to elevated temperature, the bamboo species, the preservative used (if any),
and the production method.
6 Performance requirements
6.1 Extension joints in laminations
Extension joints to increase the length of bamboo strips can
...