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The Building Bye-laws (Jersey) 2007
APPROVED DOCUMENT
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AMENDMENTS TO TECHNICAL
C GUIDANCE DOCUMENT - PART 4.
PART 4
SITE PREPARATION AND RESISTANCE TO
CONTAMINANTS AND MOISTURE
ISBN 978 1 85946 509 7
Stock code 80582
DRAFT
© Crown Copyright, 2013 to contaminants and moisturSite pr
Reprint August 2013
Copyright in the typographical arrangement rests with the Crown.
www.thenbs.com eparation and r
This publication, excluding logos, may be reproduced free of charge in any format DRAFT FOR COMMENT - JANUARY 2019
or medium for research, private study or for internal circulation within an
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misleading context. The material must be acknowledged as Crown copyright and
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e
Cert no. TT-COC-002168
ONLINE VERSION
MAIN CHANGES APPROVED DOCUMENTS
The following documents have been published
This edition replaceS the 1997 edition. to give practical guidance about how to meet the
The main changes are: Building Regulations. You can find the date of the
edition approved by the Secretary of State at
• www.planningportal.gov.uk.
Updated references to British Standards.
Approved Document A
• Structure
Site investigation recommended as the method
for determining how much unsuitable material Approved Document B: Volume 1
should be removed. Fire safety – Dwellinghouses
Approved Document B: Volume 2
• Remedial measures for dealing with land Fire safety – Buildings other than dwellinghouses
affected by contaminants expanded to include
Approved Document C
biological, chemical and physical treatment Site preparation and resistance to contaminants
processes. and moisture
• The area of land around the building subject
Approved Document D
to measures to deal with contaminants.
Toxic substances
• Guidance on protection from radon expanded Approved Document E
to include buildings other than dwellings. Resistance to the passage of sound
Approved Document F
• Guidance included on sub-soil drainage and Ventilation
the risk of transportation of water-born
contaminants. Approved Document G
Sanitation, hot water safety and water efficiency
•
New guidance on condensation risks Approved Document H
to floors, walls and roofs. Drainage and waste disposal
Approved Document J
• Guidance provided on the use of moisture Combustion appliances and fuel storage systems
resistance boards for flooring.
Approved Document K
Updated guidance on assessing the suitability of
• Protection from falling, collision and impact
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cavity walls for filling. Approved Document L1A
Conservation of fuel and power in new dwellings
Approved Document L1B
Conservation of fuel and power in existing
dwellings
Approved Document L2A
Conservation of fuel and power in new buildings
other than dwellings
Approved Document L2B
Conservation of fuel and power in existing
buildings other than dwellings
Approved Document M
Access to and use of buildings
Approved Document P
Electrical Safety – Dwellings
Approved Document 7
Materials and workmanship
*
DRAFT
TGD 4
Contents
PAGE PAGE
Use of guidance 3 Methane and other gases from the ground 19
The Technical Guidance Documents 3 Introduction 19
Limitation on requirements 3 Risk assessment 19
3 Remedial measures 20
Materials and workmanship
Radon 21
The Requirements 5 Section 3: Subsoil drainage 22
Material change of use 6 Section 4: Floors 24
Interpretation 6 Ground supported floors (moisture from
Meaning of material change of use the ground) 24
Bye-law 2 6 Technical solution 24
Requirements relating to material Alternative approach 25
Change of Use (Bye-law 6) 6
Historic buildings 7 Suspended timber ground floors (moisture
from the ground) 25
Section 0: General 9 Technical solution 26
Performance 9 Alternative approach 27
Introduction to provisions 9 Suspended concrete ground floors
10 (moisture from the ground) 27
Land affected by contaminants Technical solution 27
Definitions 10 Ground floors and floors exposed from
below (resistance to damage from
interstitial condensation) 28
Floors (resistance to surface condensation
Section 1: Clearance or treatment of and mould growth) 28
unsuitable material 12 Section 5: Walls 29
Site investigation 12
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Internal and external walls (moisture from
Unsuitable material 12 the ground) 29
Section 2: Resistance to contaminants 14 Technical solution 29
Introduction 14 Alternative approach 29
Solid and liquid contaminants 15 External walls (moisture from the outside) 31
Risk assessment 15 Solid external walls 31
General concepts 15 Technical solution 31
Stages of risk assessment 16 Alternative approach 32
Hazard identification and assessment 16 Cavity external walls 32
Risk estimation and evaluation 17 Technical solution 32
Remedial measures 17 Alternative approach 32
Introduction 17 Cavity insulation 32
Treatment 18 Framed external walls 36
Containment 18 Cracking of external walls 36
Removal 18 Impervious cladding systems for walls 36
Risks to buildings, building materials Technical solution 36
and services 18 Alternative approach 37
Joint between doors and windows 37
Door thresholds 37
Technical Guidance Document 4 Site preparation and resistance to contaminants and moisture
1
TGD 4
CONTENTS
PAGE PAGE
External walls (resistance to damage from TABLES
interstitial condensation) 38
External walls (resistance to surface 1. Examples of sites likely to contain 14
condensation and mould growth) 38 contaminants
Section 6: Roofs 39 2. Examples of possible contaminants 17
Roofs (resistance to moisture from
3. Zones for exposure to wind driven rain
the outside) 39 34
Single leaf masonry 34
Technical solution 39 4.
Alternative approach 39 Maximum recommended exposure
Roofs (resistance to damage from 5. 35
interstitial condensation) 40 zones for insulated masonry walls
Roofs (resistance to surface condensation
and mould growth) 40
British Standards referred to 41
Other documents referred to 43
DIAGRAMS
1. Example of a conceptual model
for a site showing source–
pathway–receptor 15 DRAFT
2. Subsoil drain cut during excavation 23
3. Ground supported floor – construction 25
4. Suspended timber floor – construction 26
5. Suspended floor – preventing water
collection 26
6. Typical floors exposed from below 28
7. Damp-proof courses 30
8. Protecting inner leaf 30
9. Protection of wall head from
precipitation 31
10. Insulated external walls: examples 33
11. Windows reveals for use in areas of
severe or very severe exposure to 37
driving rain
12. Accessible threshold for use in
exposed areas 38
2
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