Committees responsible for this British Standard

The preparation of this British Standard was entrusted by Technical Committee B/544, Plastering rendering, dry lining, screeds and in situ floorings, to Subcommittee B 544/6 (now redesignated as B/507/6, Screeds and in situ floorings, upon which the following bodies were represented:

Association of Concrete Industrial Flooring Contractors

Association of Lightweight Aggregate Manufacturers

Concrete Society

Contract Flooring Association

Federation of Plastering and Drywall Contractors

Federation of Resin Flooring Formulators and Applicators

Mastic Asphalt Council

Mortar Industries Association

National Federation of Terrazzo — Marble and Mosaic Specialists

National Specialist Contractors Council

Quarry Products Association

Society of Chemical Industry

Co-opted members

The following BSI references relate to the work on this British Standard Committee reference B/544/6 Draft for comment 01/101961 DC

This British Standard was published under the authority of the Standards Policy and Strategy Committee on 12 March 2003

Foreword

This part of BS 8204 has been prepared by Subcommittee B/507/6. This is a new part and does not revise or supersede any previous versions.

This part of BS 8204 has been written to provide a Code of Practice for the use of pumpable self-smoothing screeds, a type of screed not covered by other parts of BS 8204.

The other parts of BS 8204 are the following:

Part 1:2002, Code of practice for concrete bases and cement sand levelling screeds to receive floorings;
Part 2:2002, Code of practice for concrete wearing surfaces;
Part 3:1993, Code of practice for polymer modified wearing surfaces;
Part 4:1993, Code of practice for terrazzo wearing surfaces;
Part 5:1994, Code of practice for mastic asphalt underlay and wearing surfaces;
Part 6:2001, Synthetic resin floorings — Code of practice.

As a code of practice, this British Standard takes the form of guidance and recommendations. It should not be quoted as if it were a specification and particular care should be taken to ensure that claims of compliance are not misleading.

This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.

Compliance with a British Standard does not of itself confer immunity from legal obligations.

Summary of pages

This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 23 and a back cover.

The BSI copyright notice displayed in this document indicates when the document was last issued.

1 Scope

This part of BS 8204 gives recommendations for materials, design, work on site, inspection and testing of pumpable self-smoothing screeds (often known as “self-levelling screeds”).

NOTE There are two principal types of pumpable self-smoothing screeds, one predominately based on cementitious binders and the other predominately based on calcium sulfate binders.

The recommendations cover the use of pumpable levelling screeds and pumpable wearing screeds in buildings.

As a levelling screed, the screed is intended to receive floor coverings such as:

textiles;
linoleum;
polyvinyl chloride;
rubber;
cork;

or rigid floorings such as:

wood block and strip;
ceramic tiles;
natural stone;
synthetic resin wearing surfaces.

As a wearing screed, the screed is intended to provide a wearing surface itself.

2 Normative references

3 Terms and definitions

4 Exchange of information and time schedule

4.1 General

4.2 Selection of screed to be applied

4.3 Information to be provided to the screeding contractor

4.4 Information to be provided by the screeding contractor

4.5 Time schedule

5 Materials

5.1 General

5.2

5.3

5.4

6 Design considerations

6.1 Selection criteria

6.2 Base

6.3 Screed construction

6.4 Screed thickness

6.5 Bonding

6.6 Reinforcement of screeds

6.7 Location of services

6.8 Heated screeds

6.9 Screeds to stairs and screeds to falls

6.10 Joints

6.11 Levelling screeds, in situ crushing resistance category (soundness)

6.12 Wearing screed, resistance to abrasion

6.13 Slip resistance

6.14 Tolerances on level and surface regularity

6.15 Liability to cracking

6.16 Damp-proofing ground supported floors

6.17 Eliminating construction moisture

6.18 Use of admixtures

7 Work on site

7.1 Workmanship

7.2 Protection against the weather

7.3 Installation of the base

7.4 Preparation of the base to receive a pumpable and self-smoothing screed

7.5 Services, conduit and trunking

7.6 Construction of joints

7.7 Edge separation joints

7.8 Installation of the screed

8 Inspection and testing

8.1 Inspection

8.2 Testing of the completed work

Bibliography

BS 8204-7:2003

Screeds, bases and in-situ floorings - Pumpable self-smoothing screeds. Code of practice

Current, Under Review

Published:

12 Mar 2003