This part of BS 8204 gives recommendations for the design and installation of trowel finished polymer modified cementitious levelling screeds and wearing screeds, where the proportion of polymer solids based on the mass of dry cement is at least 4 %, as bonded screeds applied to direct finished concrete slabs, fine concrete screeds and to existing concrete floors within buildings.<\/p>\n
This British Standard does not apply to unbonded screeds, floating screeds, pumpable self-smoothing screeds, or those laid monolithically, neither does it apply to two-component aqueous thermosetting polymer dispersions.<\/p>\n
| PDF Pages<\/th>\n | PDF Title<\/th>\n<\/tr>\n | ||||||
|---|---|---|---|---|---|---|---|
| 1<\/td>\n | BRITISH STANDARD <\/td>\n<\/tr>\n | ||||||
| 2<\/td>\n | Committees responsible for this British\ufffdStandard <\/td>\n<\/tr>\n | ||||||
| 3<\/td>\n | Contents <\/td>\n<\/tr>\n | ||||||
| 5<\/td>\n | 1 Scope 2 Normative references <\/td>\n<\/tr>\n | ||||||
| 6<\/td>\n | 3 Terms and definitions 3.1 base 3.2 flooring 3.3 direct finished base slab 3.4 screed material 3.5 screed 3.6 levelling screed 3.7 wearing screed 3.8 bonded screed 3.9 unbonded screed 3.10 floating screed <\/td>\n<\/tr>\n | ||||||
| 7<\/td>\n | 3.11 fine concrete screed 3.12 cement sand screed 3.13 smoothing compound 3.14 departure from datum 3.15 surface regularity 3.16 polymer modified cementitious screed material 3.17 bonding agent 3.18 pot life 3.19 open time 4 Exchange of information and time schedule 4.1 General 4.2 Selection of screed to be applied <\/td>\n<\/tr>\n | ||||||
| 8<\/td>\n | 4.3 Information to be provided to the screeding contractor 4.4 Information to be provided by the screeding contractor <\/td>\n<\/tr>\n | ||||||
| 9<\/td>\n | 4.5 Time schedule 5 Materials 5.1 Polymers <\/td>\n<\/tr>\n | ||||||
| 10<\/td>\n | 5.2 Cement 5.3 Sands and aggregates <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | 5.4 Pigments 5.5 Admixtures 5.6 Water 5.7 Formulated products 5.8 Metal lathing to skirtings 6 Design 6.1 Selection parameters <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | 6.2 Service conditions and screed thickness Table 1 – Classes of wearing screeds and levelling screeds <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | 6.3 Mix proportions for wearing screeds and levelling screeds <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | Table 2 – Typical mix proportions for polymer modified cementitious wearing and levelling screeds <\/td>\n<\/tr>\n | ||||||
| 15<\/td>\n | 6.4 Resistance to abrasion Table 3 – Classification of abrasion resistance and limiting depths of wear for the abrasion test <\/td>\n<\/tr>\n | ||||||
| 16<\/td>\n | 6.5 Bonding the screed to the base 6.6 Damp-proof membranes 6.7 Tolerances on level and surface regularity <\/td>\n<\/tr>\n | ||||||
| 17<\/td>\n | Table 4 – Examples of bonding agents for use on concrete bases <\/td>\n<\/tr>\n | ||||||
| 18<\/td>\n | Table 5 – Classification of surface regularity for wearing surfaces and levelling screeds 6.8 Levelling screeds <\/td>\n<\/tr>\n | ||||||
| 19<\/td>\n | 6.9 Falls 6.10 Joints 6.11 Channels 6.12 Skirtings <\/td>\n<\/tr>\n | ||||||
| 20<\/td>\n | 6.13 Stairs Figure 1 – Typical skirting detail <\/td>\n<\/tr>\n | ||||||
| 21<\/td>\n | 6.14 Surface appearance and colour 6.15 Slip resistance 7 Preparation of concrete bases and fine concrete screeds 7.1 General 7.2 New concrete bases and fine concrete screeds <\/td>\n<\/tr>\n | ||||||
| 22<\/td>\n | Table 6 – Surface regularity of bases and fine concrete screeds to receive polymer modified cementitious sc… 7.3 Existing concrete bases 8 Work on site 8.1 Workmanship <\/td>\n<\/tr>\n | ||||||
| 23<\/td>\n | 8.2 Protection against weather 8.3 Storage <\/td>\n<\/tr>\n | ||||||
| 24<\/td>\n | 8.4 Preparation of concrete base or fine concrete screed 8.5 Protection of concrete base or fine concrete screed against damage 8.6 Batching 8.7 Mixing 8.8 Laying polymer modified cementitious screeds <\/td>\n<\/tr>\n | ||||||
| 26<\/td>\n | 9 Health and safety precautions 10 Inspection and testing of the screed 10.1 Inspection <\/td>\n<\/tr>\n | ||||||
| 27<\/td>\n | 10.2 Testing 10.3 Levels and surface regularity 10.4 Abrasion resistance 10.5 Slip resistance 10.6 Adhesion of the screed to the base <\/td>\n<\/tr>\n | ||||||
| 28<\/td>\n | 10.7 In situ crushing resistance 11 Maintenance <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Screeds, bases and in situ floorings – Polymer modified cementitious levelling screeds and wearing screeds. Code of practice<\/b><\/p>\n |