BS 5262:1991

Committees responsible
Foreword
Code of practice
Section 1. General
1 Scope
2 Definitions
3 Exchange of information
4 Building programme
Section 2. Materials
5 Cements
6 Limes
7 Aggregates
7.1 Sands
7.2 Coarse aggregate
7.3 Artificial aggregates
8 Pigments
9 Fibres
10 Admixtures
10.1 General
10.2 Plasticizers
10.3 Waterproofers
10.4 Water-retentive agents
10.5 Polymer dispersions
11 Bonding agents
12 Water
13 Ready-mixed rendering materials
13.1 Ready-mixed lime:sand
13.2 Retarded ready-to-use cement:lime:sand or cement:
      sand
13.3 Bagged rendering materials
13.4 Proprietary materials
14 Reinforcement, metal lathing and beads
14.1 General
14.2 Expanded metal
14.3 Ribbed lathing
14.4 Welded wire mesh
14.5 Non-metallic mesh
14.6 Beads and stops
15 Fixings
15.1 General
15.2 Nails and pins
15.3 Staples
15.4 Screws and bolt fixings
15.5 Washers and ancillary angles, brackets or cleats
15.6 Wire
15.7 Fixing blocks in solid backgrounds
15.8 Plugs
16 Firring
Section 3. Design
17 Factors influencing the design of the rendering
      system
17.1 Choice of rendering mixes
17.2 Provision of joints
17.3 Preparation of background
17.4 Detailing of architectural features
18 Conditions of exposure
19 Resistance to rain penetration
20 Soluble salts in background
21 Effects of atmospheric pollution
22 Corrosion of metals
23 Effects of freezing
24 Thermal properties
25 Durability
25.1 General
25.2 The background, its nature and durability
25.3 Type of rendering
25.4 The method of application, particularly in
      relation to the nature of the background
26 Fire resistance and combustibility
27 Resistance to cracking
27.1 Movement of the structural background
27.2 Movement of the rendering
27.3 Crack control
28 Resistance to crazing
29 Protection afforded by architectural features
29.1 General
29.2 Parapet and screen walls
29.3 Eaves and verges
29.4 String courses and similar features
29.5 Sills
29.6 Soffits and reveals
29.7 Treatment at base of walls
30 Rendering to chimney stacks
31 Mixes
31.1 General
31.2 Designation I mixes
31.3 Designations II, III and IV mixes
31.4 Designation V mixes
31.5 Spatterdash mixes
31.6 Machine- and trowel-applied decorative finishes
31.7 Mixes containing polymer dispersions
31.8 Mixes containing fibres
31.9 Special mixes for external insulation
32 Number and thickness of coats
32.1 General
32.2 Spatterdash, stipple and adhesive slurry
32.3 Dubbing-out
32.4 Undercoats
32.5 Final coat
33 Types of finish
33.1 General
33.2 Trowel finishes
33.3 Thrown finishes
34 Colour and texture
34.1 General
34.2 Solar radiation
35 Ornamentation in relief
35.1 General
35.2 Moulding and modelling
35.3 Sgraffito
Section 4. Backgrounds
36 Characteristics
36.1 General
36.2 Strength
36.3 Suction
36.4 Key
36.5 Joints and cracks
36.6 Durability
37 Types
38 Preparation of background
38.1 General
38.2 Preparatory treatments
38.3 Brickwork
38.4 Blockwork
38.5 Concrete
38.6 Insulation boards
38.7 Reinforcement
Section 5. Work on site
39 Storage of materials
39.1 Lime, cement and pre-mixed dry bagged materials
39.2 Ready-mixed lime:sand for mortar
39.3 Ready-to-use cement:lime: sand or cement:sand
39.4 Aggregates
39.5 Metal lathing and firring battens
40 Scaffolding
41 Cleanliness and protection of adjacent work
42 Proportioning
43 Mixing
43.1 General
43.2 Preparing mixes of cement:lime:sand
43.3 Preparing mixes of cement and sand used with
      plasticizers
43.4 Preparing mixes of masonry cement and sand
43.5 Preparing mixes of containing fibres
44 Forming architectural features
45 Application of the various coats
45.1 General
45.2 Curing
45.3 First undercoat
45.4 Subsequent undercoat
45.5 Final coat
46 Machine-applied renderings
47 Polymer-modified cement-based renderings
Section 6. Maintenance and repair
48 General
49 Inspection
50 Repairs to cracks
50.1 General
50.2 Rendered finishes only
50.3 Renderings and background
50.4 Making good to rendering
51 Repair of hollow or detached areas
51.1 General
51.2 Rendered finish only
51.3 Spalled backgrounds
52 Overcoming unsatisfactory appearance
52.1 General
52.2 Cleaning
52.3 Paint treatment
52.4 Further rendering coats
53 Overcoming water penetration
53.1 General
53.2 Colourless treatments
53.3 Paint treatments
54 Repairs to painted rendering or stucco
Appendix
A Inspection of defective renderings
Tables
1 Mixes suitable for rendering
2 Severe exposure: recommended rendering
      specifications
3 Moderate and sheltered exposure: recommended
      rendering specifications
4 Summary of precautions for rendering on to various
      types of new backgrounds
5 Summary of recommendations for rendering on to
      contaminated or deteriorated existing backgrounds
Figures
1 Fixings installed in wall before rendering
2 Annual driving-rain index: British Isles
3 Annual relative driving-rain index for each of
      eight wind directions at 20 stations
4 Movement joints in rendering aligned to movement
      joints in background
5 Elevation showing possible position of movement
      joints in rendering on metal lathing
6 Parapet and string course details
7 Types of sill
8 Alternative details at base of walls
9 Illustration of rendering defects