Adhesives for floor coverings - Preparation of adhesive application - Test methods for the determination of corresponding humidity of mineral substrates

This document specifies test methods for assessment of the moisture conditions of any kind of subfloor prior to the installation of levelling compounds and/or floor coverings or parquet floors bonded with adhesives. The methods are independent from subfloor chemical composition or materials and applicable with available equipment.
For some highly reactive cement based compositions (e.g. ternary systems) the manufacturer might recommend a specific time when the subfloor is ready to be covered.
This document describes the methods in detail and includes a protocol template for documenting the measured values.

Klebstoffe für Bodenbeläge - Vorbereitung der Klebstoffanwendung - Prüfverfahren zur Bestimmung der korrespondierenden Luftfeuchte von mineralischen Untergründen

Dieses Dokument legt Prüfverfahren zur Beurteilung des Feuchtezustands jeglicher Art von Unterböden vor dem Auftrag von Bodenspachtelmassen und/oder Bodenbelägen oder Parkettböden, die mit Klebstoffen geklebt werden, fest. Die Prüfverfahren sind unabhängig von der chemischen Zusammensetzung des Unterbodens, werkstoffunabhängig und mit handelsüblichen Geräten anwendbar.
Bei einigen hochreaktiven zementbasierten Systemen (z. B. ternären Systemen) kann der Hersteller eine bestimmte Zeit empfehlen, wann der Unterboden zur Belegung bereit ist.
Dieses Dokument beschreibt die Verfahren im Detail und enthält eine Vorlage für ein Berichtsblatt zur Dokumentation der gemessenen Werte.

Adhésifs pour revêtements de sol - Préparation de l’application d'adhésif - Méthodes d’essai pour la détermination de la teneur en humidité relative d'équilibre dans les supports minéraux

Le présent document spécifie des méthodes d’essai pour évaluer les conditions d’humidité de tout type de chape avant l’installation de composés de nivellement et/ou de revêtements de sol ou de parquets fixés à l’aide d’adhésifs. Les méthodes sont indépendantes de la composition chimique ou des matériaux de la chape et sont applicables avec l’équipement disponible.
Pour certaines compositions à base de ciment hautement réactif (systèmes ternaires par exemple), le fabricant peut recommander une durée spécifique avant recouvrement de la chape.
Le présent document décrit les méthodes en détail et comprend un modèle de protocole à suivre pour documenter les valeurs mesurées.

Lepila za talne obloge - Priprava za nanašanje lepila - Preskusna metoda za ugotavljanje ustrezne vlažnosti mineralnih podlag

General Information

Status
Published
Public Enquiry End Date
30-Jul-2021
Publication Date
19-Sep-2022
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
16-Sep-2022
Due Date
21-Nov-2022
Completion Date
20-Sep-2022

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SLOVENSKI STANDARD
SIST EN 17668:2022
01-november-2022
Lepila za talne obloge - Priprava za nanašanje lepila - Preskusna metoda za
ugotavljanje ustrezne vlažnosti mineralnih podlag

Adhesives for floor coverings - Preparation of adhesive application - Test methods for the

determination of corresponding humidity of mineral substrates

Klebstoffe für Bodenbeläge - Vorbereitung der Klebstoffanwendung - Prüfverfahren zur

Bestimmung der korrespondierenden Luftfeuchte von mineralischen Untergründen

Adhésifs pour revêtements de sol - Préparation de l’application d'adhésif - Méthodes

d’essai pour la détermination de la teneur en humidité relative d'équilibre dans les

supports minéraux
Ta slovenski standard je istoveten z: EN 17668:2022
ICS:
83.180 Lepila Adhesives
97.150 Talne obloge Floor coverings
SIST EN 17668:2022 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN 17668:2022
---------------------- Page: 2 ----------------------
SIST EN 17668:2022
EN 17668
EUROPEAN STANDARD
NORME EUROPÉENNE
September 2022
EUROPÄISCHE NORM
ICS 83.180
English Version
Adhesives for floor coverings - Preparation of adhesive
application - Test methods for the determination of
corresponding humidity of mineral substrates

Adhésifs pour revêtements de sol - Préparation de Klebstoffe für Bodenbeläge - Vorbereitung der

l'application d'adhésif - Méthodes d'essai pour la Klebstoffanwendung - Prüfverfahren zur Bestimmung

détermination de la teneur en humidité relative der korrespondierenden Luftfeuchte von

d'équilibre dans les supports minéraux mineralischen Untergründen
This European Standard was approved by CEN on 10 July 2022.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this

European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references

concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN

member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by

translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management

Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,

Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and

United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 17668:2022 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN 17668:2022
EN 17668:2022 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

Introduction .................................................................................................................................................................... 4

1 Scope .................................................................................................................................................................... 5

2 Normative references .................................................................................................................................... 5

3 Terms and definitions ................................................................................................................................... 5

4 Apparatus ........................................................................................................................................................... 6

5 Test procedures ............................................................................................................................................... 8

5.1 Principle ............................................................................................................................................................. 8

5.2 Preparations in general ................................................................................................................................ 9

5.3 Specific preparations before measurement .......................................................................................... 9

5.3.1 Hygrometer sample method ....................................................................................................................... 9

5.3.2 Hygrometer box method .............................................................................................................................. 9

5.3.3 Hygrometer sleeve method ...................................................................................................................... 10

5.4 Recording measured values ..................................................................................................................... 11

5.4.1 General ............................................................................................................................................................. 11

5.4.2 Hygrometer sample method .................................................................................................................... 11

5.4.3 Hygrometer box method ........................................................................................................................... 12

5.4.4 Hygrometer sleeve method ...................................................................................................................... 12

6 Test report ...................................................................................................................................................... 12

Bibliography ................................................................................................................................................................. 14

---------------------- Page: 4 ----------------------
SIST EN 17668:2022
EN 17668:2022 (E)
European foreword

This document (EN 17668:2022) has been prepared by Technical Committee CEN/TC 193 “Adhesives”,

the secretariat of which is held by UNE.

This European Standard shall be given the status of a national standard, either by publication of an

identical text or by endorsement, at the latest by March 2023, and conflicting national standards shall be

withdrawn at the latest by March 2023.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN shall not be held responsible for identifying any or all such patent rights.

Any feedback and questions on this document should be directed to the users’ national standards body.

A complete listing of these bodies can be found on the CEN website.

According to the CEN-CENELEC Internal Regulations, the national standards organisations of the

following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia,

Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland,

Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North

Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the United

Kingdom.
---------------------- Page: 5 ----------------------
SIST EN 17668:2022
EN 17668:2022 (E)
Introduction

This document describes test methods for measuring humidity in, at or from a mineral substrate. Using

these test methods will assist a floor layer in determining whether a floor is suitable to accept a levelling

compound and/or an adhesive and a floor covering. High humidity can lead to the decomposition of

moisture-sensitive levelling compounds and/or the decomposition or disruption and subsequent

weakening of flooring adhesives used for installation. This results in a complete failure of the construction

or in a reduction in adhesive strength and a negative impact on indoor air quality due to increased overall

VOC emissions and bad odour. Using these test methods, a floor layer will be able to decide on the time

at which the levelling compound and/or adhesive can be applied in order to help to avoid potential,

humidity related problems. They provide data to determine whether the load-bearing, mineral substrate

is ready for covering.

This document supplements the national standards already described for determining the moisture

conditions of mineral substrates.

The material independent information regarding the moisture activity is one of the advantages of these

measurement methods. They provide reliable data to help to establish the readiness for installation,

especially for mineral substrates containing additives.

SAFETY WARNING — Persons using this document should be familiar with normal practice. The

document cannot address all safety problems that can be associated with its application. It is the

responsibility of the user to define measures for health and safety at work and ensure that these

correspond with the European and national regulations.
---------------------- Page: 6 ----------------------
SIST EN 17668:2022
EN 17668:2022 (E)
1 Scope

This document specifies test methods to measure humidity of any kind of mineral substrate prior to the

installation of levelling compounds and/or floor coverings or parquet floors bonded with adhesives. The

methods are independent of the mineral substrate chemical composition or materials and applicable with

commercially available equipment.
This document is not applicable to loose lay installations.

The measurement of the moisture content of mineral substrates according to EN 13813 is described in

EN 1264-4.
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.

EN 923:2015, Adhesives — Terms and definitions
3 Terms and definitions

For the purposes of this document, the terms and definitions given in EN 923:2015 and the following

apply.

ISO and IEC maintain terminological 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
moisture
presence of water in trace amounts
3.2
humidity
water vapour partial pressure present in air
3.3
relative humidity

ratio of the partial pressure of water vapour to the equilibrium vapour pressure of water at a given

temperature
Note 1 to entry: It is usually expressed as a percentage.
3.4
corresponding relative humidity
CRH

relative humidity in percent, which is present in the air close to a sample of the material at equilibrium

Note 1 to entry: The corresponding relative humidity is expressed in % RH or as the absolute number as water

activity.
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SIST EN 17668:2022
EN 17668:2022 (E)
3.5
hygrometer sample method

method to measure humidity of a mineral substrate by measuring the relative humidity in a container

(e. g. polyethylene bag or flask) directly at a sample of the mineral substrate
3.6
hygrometer box method

method to measure humidity of a mineral substrate by measuring the relative humidity in a pocket of air

entrapped between an impervious thermally insulated housing and the mineral base
3.7
hygrometer sleeve method

method to measure humidity of a mineral substrate by measuring the humidity inside predrilled

boreholes within a sleeve with an opening at defined depth

Note 1 to entry: Depth definitions are only available if concrete is the mineral substrate.

3.8
calibration

comparison of the value measured by an instrument with a well-defined reference value, traceable and

of an accuracy at least one class better than that of the measuring instrument

Note 1 to entry: A calibration covering the whole working range of the measuring instrument provides a basis for

an adjustment of the values measured by the instrument.
4 Apparatus

4.1 Hygrometer. An instrument capable of measuring the temperature and relative humidity shall be

used (see Figure 1). The instrument and sensors shall be suited for use in the field. After calibration, the

instrument shall measure relative humidity to an accuracy of ± 3 % between 10 % RH to 90 % RH and

temperature to an accuracy ± 0,1 °C.
---------------------- Page: 8 ----------------------
SIST EN 17668:2022
EN 17668:2022 (E)
Dimensions in millimetres
a) Typical apparatus using hygrometer
b) Typical apparatus using RH probe
Key
1 window
2 insulation
3 butyl sealant
4 vapour barrier
5 floor
6 humidity measuring tip
7 air pocket
8 RH probe
9 plug
Figure 1 — Typical apparatus for the hygrometer box method (see [3])
---------------------- Page: 9 ----------------------
SIST EN 17668:2022
EN 17668:2022 (E)

Light weight and small size measurement sensors are preferred to avoid measurement error related to

temperature changes during measurement. Moisture transfer through measurement sensor from the

borehole to surroundings shall be eliminated. Sensor response time shall be applicable for the purpose.

Measurement accuracy is normally lower than accuracy of sensor due to the measurement error sources

during measurement.

The instrument manufacturer should define the required values for reliable measurement.

4.2 Insulated impermeable box, which can be sealed to the floor surface to create an enclosed pocket

of air which is isolated from fluctuations in humidity and temperature from outside air (examples of

suitable equipment are shown in Figure 1).

It is essential that the insulated box is sealed to the floor using a preformed butyl seala

...

SLOVENSKI STANDARD
oSIST prEN 17668:2021
01-julij-2021
Lepila za talne obloge - Priprava za nanašanje lepila - Preskusna metoda za
ugotavljanje čezmerne vlage v podtalju

Adhesives for floor coverings - Preparation of adhesive application - Test method for the

determination of excessive humidity in subfloors

Klebstoffe für Bodenbeläge - Vorbereitung des Klebstoffauftrags - Prüfverfahren zur

Bestimmung des Restfeuchtigkeitsgehalts von Unterböden

Adhésifs pour revêtements de sol - Préparation de l'application d'adhésif - Méthode

d'essai pour la détermination de l'humidité excessive dans les chapes
Ta slovenski standard je istoveten z: prEN 17668
ICS:
83.180 Lepila Adhesives
97.150 Talne obloge Floor coverings
oSIST prEN 17668:2021 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
oSIST prEN 17668:2021
---------------------- Page: 2 ----------------------
oSIST prEN 17668:2021
DRAFT
EUROPEAN STANDARD
prEN 17668
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2021
ICS 83.180
English Version
Adhesives for floor coverings - Preparation of adhesive
application - Test method for the determination of
excessive humidity in subfloors

Adhésifs pour revêtements de sol - Préparation de Klebstoffe für Bodenbeläge - Vorbereitung des

l'application d'adhésif - Méthode d'essai pour la Klebstoffauftrags - Prüfverfahren zur Bestimmung des

détermination de l'humidité excessive dans les chapes Restfeuchtigkeitsgehalts von Unterböden

This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee

CEN/TC 193.

If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations

which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other

language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC

Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,

Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and

United Kingdom.

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 supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without

notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 17668:2021 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
oSIST prEN 17668:2021
prEN 17668:2021 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

Introduction .................................................................................................................................................................... 4

1 Scope .................................................................................................................................................................... 5

2 Normative references .................................................................................................................................... 5

3 Terms and definitions ................................................................................................................................... 5

4 Apparatus ........................................................................................................................................................... 6

5 Test procedures ............................................................................................................................................... 9

5.1 Principle ............................................................................................................................................................. 9

5.2 Preparations in general ................................................................................................................................ 9

5.3 Specific preparations before measurement .......................................................................................... 9

5.3.1 Hygrometer sample method ....................................................................................................................... 9

5.3.2 Hygrometer box method .............................................................................................................................. 9

5.3.3 Hygrometer sleeve method ...................................................................................................................... 10

5.4 Recording measured values ..................................................................................................................... 11

5.4.1 General ............................................................................................................................................................. 11

5.4.2 Hygrometer sample method .................................................................................................................... 11

5.4.3 Hygrometer box method ........................................................................................................................... 12

5.4.4 Hygrometer sleeve method ...................................................................................................................... 12

6 Test report ...................................................................................................................................................... 13

Annex A (informative) Protocol for the report of the CRH value of subfloors according to

EN 17668 ......................................................................................................................................................... 14

Bibliography ................................................................................................................................................................. 16

---------------------- Page: 4 ----------------------
oSIST prEN 17668:2021
prEN 17668:2021 (E)
European foreword

This document (prEN 17668:2021) has been prepared by Technical Committee CEN/TC 193 “Adhesives”,

the secretariat of which is held by UNE.
This document is currently submitted to the CEN Enquiry.
---------------------- Page: 5 ----------------------
oSIST prEN 17668:2021
prEN 17668:2021 (E)
Introduction

This document describes test methods for measuring humidity in a subfloor. Using these test methods

will assist a floor layer in determining whether a floor is suitable to accept a levelling compound and/or

an adhesive and a floor covering. High levels of humidity may lead to the (disruption of moisture sensitive

levelling compounds or) breakdown and subsequent weakening of the adhesives used for the installation

of the floor covering. The result is a reduction in adhesive strength and a negative impact on indoor air

quality due to increased overall VOC emissions and bad odour. Using these test methods, a floor layer will

be able to decide on the time at which the levelling compound and/or adhesive can be applied in order

to help to avoid potential, moisture related problems. As stated in the scope, the test method will be

independent of the subfloor material, not measuring a subfloor characteristic, but a subfloor condition.

This document supplements the national standards already described for determining the moisture

conditions of concrete floors.

The material independent information regarding the moisture state is one of the outstanding advantages

of these measurement methods. They provide highly reliable data to help to establish the readiness for

installation, especially for screeds containing additives.

SAFETY WARNING — Persons using this document should be familiar with normal laboratory practice.

The document cannot address all safety problems that may be associated with its application. It is the

responsibility of the user to define measures for health and safety at work and ensure that these

correspond with the European and national regulations.

ENVIRONMENTAL PROTECTION NOTE — The materials approved in this document can have negative

effects on the environment. As soon as technological progress leads to better alternatives to these

materials, they can be removed from the document as far as possible. At the end of the test, the user

should ensure a suitable disposal of the waste corresponding to the regional conditions.

---------------------- Page: 6 ----------------------
oSIST prEN 17668:2021
prEN 17668:2021 (E)
1 Scope

This document specifies test methods for assessment of the moisture conditions of any kind of subfloor

prior to the installation of levelling compounds and/or floor coverings or parquet floors bonded with

adhesives. The methods are independent from subfloor chemical composition or materials and applicable

with available equipment.

For some highly reactive cement based compositions (e.g. ternary systems) the manufacturer might

recommend a specific time when the subfloor is ready to be covered.

This document describes the methods in detail and includes a protocol template for documenting the

measured values.
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.

EN 923:2015, Adhesives — Terms and definitions
3 Terms and definitions

For the purposes of this document, the terms and definitions given in EN 923:2015 and the following

apply.

ISO and IEC maintain terminological 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
moisture
presence of water in trace amounts
3.2
humidity
water vapour partial pressure present in air
3.3
relative humidity

ratio of the partial pressure of water vapour to the equilibrium vapour pressure of water at a given

temperature
Note 1 to entry: It is usually expressed as a percentage.
3.4
readiness for covering

state of a subfloor, when it is suitable for the permanent, damage- and defect-free installation of these

coverings
---------------------- Page: 7 ----------------------
oSIST prEN 17668:2021
prEN 17668:2021 (E)
3.5
corresponding relative humidity
CRH

relative humidity in percent, which is present in the air above a sample of the material at or close to

equilibrium

Note 1 to entry: The corresponding relative humidity is expressed in % RH or as the absolute number as water

activity.
3.6
hygrometer sample method

assessment of the moisture state of a substrate by measuring the relative humidity in a container (e. g.

polyethylene bag or flask) directly above a sample of the substrate
3.7
hygrometer box method

assessment of the moisture state of a substrate by measuring the relative humidity in a pocket of air

entrapped between an impervious thermally insulated housing and the screed/concrete base

3.8
hygrometer sleeve method

assessment of the moisture state of a substrate by measuring the humidity inside predrilled boreholes

within a sleeve with an opening at defined depth
3.9
calibration

comparison of the value measured by an instrument with a well-defined reference value, traceable and

of an accuracy at least one class better than that of the measuring instrument

Note 1 to entry: A calibration covering the whole working range of the measuring instrument provides a basis for

an adjustment of the values measured by the instrument.
3.10
drift
change in the RH reading of an instrument at constant RH

Note 1 to entry: With drift in an instrument the RH reading changes for the same RH as time goes by.

4 Apparatus
4.1 Hygrometer

An instrument capable of measuring the temperature and relative humidity shall be used (see Figure 1).

The instrument and sensors shall be suited for use in the field. After calibration, the instrument shall

measure relative humidity to an accuracy of ± 3 % between 10 % RH to 90 % RH and temperature to an

accuracy ± 0,1 °C.
---------------------- Page: 8 ----------------------
oSIST prEN 17668:2021
prEN 17668:2021 (E)
a) Typical apparatus using hygrometer
b) Typical apparatus using RH probe
Key
1 window
2 insulation
3 butyl sealant
4 vapour barrier
5 floor
6 humidity measuring tip
7 air pocket
8 RH probe
9 plug
Figure 1 — Typical apparatus for the hygrometer box method (see [2])
---------------------- Page: 9 ----------------------
oSIST prEN 17668:2021
prEN 17668:2021 (E)

Light weight and small size measurement sensors are preferred to avoid measurement error related to

temperature changes during measurement. Moisture transfer through measurement sensor from the

borehole to surroundings shall be eliminated. Sensor response time should be applicable for the purpose.

Measurement accuracy is normally lower than accuracy of sensor due to the measurement error sources

during measurement.

NOTE Comparing commercially available hygrometers, significant differences were found in the following

parameters:
— accuracy after 30 min;
— accuracy after 60 min;
— drift over a period of 5 weeks;

— suitability for building sites, i.e. measuring accuracy after intensive dusting with cement.

The instrument manufacturer should define the required values for reliable measurement.

4.2 Insulated impermeable box, which can be sealed to the floor surface to create an enclosed pocket

of air which is isolated from fluctuations in humidity and temperature from outside air (examples of

suitable equipment are shown in Figure 1).

It is essential that the insulated box is sealed to the floor using a preformed butyl sealant tape (4.3) and

that readings can be taken while the apparatus is in position on the floor without breaking the seal and

releasing the trapped pocket of air.

Other forms of apparatus may be suitable but the width of the quadratic area should not be less than

150 mm and it is essential that the principles of thermal insulation and vapour barrier are followed, so

that an insulated vapour-proof space is created.

Suitable vapour barrier materials are sheet metal, glass, 2 mm thick clear acrylic sheet, or 2 mm thick

PVC-U, and the apparatus should have a maximum heat transmission value of 1,0 W/(m ·K).

4.3 Preformed butyl sealant tape.
4.4 Adhesive tape.
4.5 Protective mats, rubber or polyethylene.
4.6 Hammer, chisel, bowl and spoon.
4.7 Rotary hammer drill and carbide drill, bit of appropriate diameter.
4.8 Vacuum cleaner with appropriate nozzle.

4.9 Measurement sleeve, plastic tube with the same outer diameter than the borehole of appropriate

length (see Figure 4). Sensor manufacturers may also offer prefabricated measurement sleeves with

additional properties to help installation in practise.
4.10 Water vapour impermeable sealant or putty.
4.11 Balance, with accuracy of ± 1
...

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