Document C - Site Preparation And Resistance To Moisture 2004.pdf - UK & WALES BUILDING REGULATIONS - Kielons

The Building Regulations 2000

Site preparation and resistance to

contaminants and moisture

APPROVED DOCUMENT

Site preparation and resistance to contaminants

Resistance to moisture

MAIN CHANGES IN THE 2004

EDITION

This edition of Approved Document C, Site

preparation and resistance to contaminants

and moisture, replaces the 1992 (with 2000

amendments) edition. The main changes are:

C2 Resistance to moisture

g) New guidance recommends that in order to

reduce the condensation risk to floors, walls

and roofs reference should be made to the

revised BS 5250 and “Limiting thermal bridging

and air leakage: robust details” and BR 262

“Thermal insulation: avoiding risks.”

C1 Site preparation and resistance to

contaminants

Site preparation

h) Guidance is now provided on the use of

moisture resistant boards for the flooring in

bathrooms, kitchens and other places where

water may be spilled from sanitary fittings or

fixed appliances.

a) Site investigation is now recommended as

the method for determining how much

unsuitable material should be removed.

Resistance to contaminants

b) Requirement C1(2) now applies to material

change of use as set out in Regulations 5 and

i) Reference is made to BS 8208 for assessing

the suitability of cavity walls for filling together

with the map and table in BR 262.

j) Interface between walls and doors and

windows. Check rebates are now

recommended in the most exposed parts of the

country.

c) Remedial measures for dealing with land

affected by contaminants have been expanded

to include biological, chemical and physical

treatment processes.

k) New guidance points to the need for better

attention to detail in exposed areas where level

access is provided to support Part M, Access

to and use of buildings to ensure adequate

provision is made for resistance to moisture.

d) The area of land that is subject to measures

to deal with contaminants now includes the

land around the building.

e) Guidance on protection from radon is

expanded to include buildings other than

dwellings.

l) Former Requirement F2; Condensation in

roofs, has been transferred to Part C as it deals

with effects on the building fabric rather than

ventilation for the health of occupants.

Sub-soil drainage

f) Guidance is included relating to sub-soil

drainage and the risk of transportation of

water-borne contaminants.

Site preparation and resistance to contaminants and moisture

Approved Document C

Contents

PAGE

Use of Guidance

Technical solution

Alternative approach

The Requirements

Suspended concrete ground floors

(moisture from the ground)

Material change of use

Interpretation (Regulation 2)

Technical solution

Meaning of material change of use

(Regulation 5)

Ground floors and floors exposed from

below (resistance to damage from

interstitial condensation)

Requirements relating to material change of

use (Regulation 6)

Floors (resistance to surface condensation

and mould growth)

Historic buildings

Section 0: General

Section 5: Walls

Internal and external walls (moisture from

the ground)

Performance

Introduction to provisions

Technical solution

Flood risk

Alternative approach

Land affected by contaminants

External walls (moisture from the outside)

Authorities that should be notified about

contamination

Solid external walls

Technical solution

Definitions

Alternative approach

Section 1: Clearance or treatment

of unsuitable material

Cavity external walls

Technical solution

Site investigation

Alternative approach

Unsuitable material

Cavity insulation

Section 2: Resistance to

contaminants

Framed external walls

Cracking of external walls

Introduction

Impervious cladding systems for walls

Solid and liquid contaminants

Technical solution

Risk assessment

Alternative approach

Remedial measures

Joint between doors and windows

Risks to buildings, building materials and

services 18

Methane and other gases from the ground 19

Introduction

Door thresholds

External walls (resistance to damage from

interstitial condensation)

External walls (resistance to surface

condensation and mould growth)

Risk assessment

Remedial measures

Radon

Section 6: Roofs

Roofs (resistance to moisture from the

outside)

Section 3: Sub-soil drainage

Section 4: Floors

Technical solution

Alternative approach

Ground supported floors (moisture from

the ground)

Roofs (resistance to damage from interstitial

condensation)

Technical solution

Roofs (resistance to surface condensation

and mould growth)

Alternative approach

Suspended timber ground floors

(moisture from the ground)

Approved Document C

Site preparation and resistance to contaminants and moisture

CONTENTS

PAGE

British Standards referred to

Other documents referred to

Annex A: Guidance on the assessment of

land affected by contaminants

References to Annex A

DIAGRAMS

Distribution of shrinkable clays and

principal sulfate/sulfide bearing strata

in England and Wales

Example of a conceptual model for a

site showing source-pathway-receptor 15

Subsoil drain cut during excavation

Ground supported floor-construction 25

Suspended timber floor – construction 26

Suspended floor – preventing water

collection

Typical floors exposed from below

Damp proof courses

Protecting inner leaf

10. Protection of wall head from

precipitation 31

11. Insulated external walls: examples 33

12. UK zones for exposure to driving rain 34

13. Windows reveals for use in areas of

severe or very severe exposure to

driving rain

14. Accessible threshold for use in

exposed areas

A1. The process of managing land

affected by contaminants

TABLES

Volume change potential for some

common clays

Examples of sites likely to contain

contaminants

Examples of possible contaminants

4. Maximum recommended exposure

zones for insulated masonaty walls

Site preparation and resistance to contaminants and moisture

Approved Document C

THE BUILDING REGULATIONS 2000

Use of Guidance

THE APPROVED DOCUMENTS

This document is one of a series that has been

approved by the First Secretary of State for the

purpose of providing practical guidance with

respect to the requirements of Schedule 1 to

and Regulation 7 of the Building Regulations

2000 (SI 2000/2531) for England and Wales. SI

2000/2531 has been amended by the Building

(Amendment) Regulations 2001 (SI 2001/3335),

by the Building (Amendment) Regulations 2002

(SI 2002/440), by the Building (Amendment)

(No. 2) Regulations 2002 (SI 2002/2871), by the

Building (Amendment) Regulations 2003 (SI

2003/2692) and by the Building (Amendment)

Regulations 2004 (SI 2004/1465).

At the back of this document is a list of all

the documents that have been approved and

issued by the First Secretary of State for this

purpose.

Approved Documents are intended to provide

guidance for some of the more common

building situations. However, there may well be

alternative ways of achieving compliance with

the requirements. Thus there is no obligation

to adopt any particular solution contained in

an Approved Document if you prefer to meet

the relevant requirement in some other way.

persons habitually employed in the building in

question.

Paragraphs H2 and J6 are excluded from

Regulation 8 because they deal directly with

prevention of the contamination of water. Parts

E and M (which deal, respectively, with

resistance to the passage of sound, and

access to and use of buildings) are excluded

from Regulation 8 because they address the

welfare and convenience of building users. Part

L is excluded from Regulation 8 because it

addresses the conservation of fuel and power.

All these matters are amongst the purposes,

other than health and safety, that may be

addressed by Building Regulations.

MATERIALS AND WORKMANSHIP

Any building work which is subject to the

requirements imposed by Schedule 1 to the

Building Regulations should, in accordance

with Regulation 7, be carried out with proper

materials and in a workmanlike manner.

You may show that you have complied with

Regulation 7 in a number of ways. These

include the appropriate use of a product

bearing CE marking in accordance with the

Construction Products Directive (89/106/EEC) 1

as amended by the CE Marking Directive

(93/68/EEC) 2 , or a product complying with an

appropriate technical specification (as defined

in those Directives), a British Standard, or an

alternative national technical specification of

any state which is a contracting party to the

European Economic Area which, in use, is

equivalent, or a product covered by a national

or European certificate issued by a European

Technical Approval issuing body, and the

conditions of use are in accordance with the

terms of the certificate. You will find further

guidance in the Approved Document

supporting Regulation 7 on materials and

workmanship.

Other requirements

The guidance contained in an Approved

Document relates only to the particular

requirements of the Regulations which the

document addresses. The building work will

also have to comply with the Requirements of

any other relevant paragraphs in Schedule 1 to

the Regulations.

There are Approved Documents which give

guidance on each of the Parts of Schedule 1

and on Regulation 7.

LIMITATION ON REQUIREMENTS

In accordance with Regulation 8, the

requirements in Parts A to D, F to K and N

(except for paragraphs H2 and J6) of Schedule

1 to the Building Regulations do not require

anything to be done except for the purpose of

securing reasonable standards of health and

safety for persons in or about buildings (and

any others who may be affected by buildings or

matters connected with buildings).

The requirements in Part C address health and

safety, and do not seek to protect the building

fabric for its own sake. Thus the degree of

precautions needed to comply with Part C will

be influenced by the intended use of the

building. Part C may not apply where it can be

demonstrated that it will not serve to increase

the protection to the health and safety of any

Independent certification schemes

There are many UK product certification

schemes. Such schemes certify compliance

with the requirements of a recognised

document which is appropriate to the purpose

for which the material is to be used. Materials

which are not so certified may still conform to

a relevant standard.

Many certification bodies which approve such

schemes are accredited by UKAS.

As implemented by the Construction Products

Regulations 1991 (SI 1991/1620).

As implemented by the Construction Products

(Amendment) Regulations 1994 (SI 1994/3051).

Approved Document C

Site preparation and resistance to contaminants and moisture

Document C - Site Preparation And Resistance To Moisture 2004.pdf

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