BS 8204-7:2003
$142.49
Screeds, bases and in-situ floorings – Pumpable self-smoothing screeds. Code of practice
| Published By | Publication Date | Number of Pages |
| BSI | 2003 | 28 |
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.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 1 | BRITISH STANDARD |
| 2 | Committees responsible for this British�Standard |
| 3 | Contents |
| 5 | 1 Scope 2 Normative references |
| 6 | 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 3.11 departure from datum 3.12 surface regularity |
| 7 | 3.13 in situ crushing resistance (ISCR) 3.14 pumpable self-smoothing scree 3.15 flow ring value 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 |
| 8 | 4.4 Information to be provided by the screeding contractor 4.5 Time schedule |
| 9 | 5 Materials 5.1 General 5.2 Water 5.3 Gauging liquid 5.4 Reinforcement for crack control 6 Design considerations 6.1 Selection criteria 6.2 Base |
| 10 | 6.3 Screed construction 6.4 Screed thickness |
| 11 | Table 1 Minimum thickness of pumpable self-smoothing cement based screeds (both�levelling and bonded wear… Table 2 Minimum thickness of pumpable self-smoothing calcium sulfate based levelling�screeds 6.5 Bonding |
| 12 | 6.6 Reinforcement of screeds 6.7 Location of services 6.8 Heated screeds 6.9 Screeds to stairs and screeds to falls |
| 13 | 6.10 Joints 6.11 Levelling screeds, in�situ crushing resistance category (soundness) |
| 14 | 6.12 Wearing screed, resistance to abrasion Table 3 Classification of abrasion resistance 6.13 Slip resistance 6.14 Tolerances on level and surface regularity |
| 15 | Table 4 Classification of surface regularity of pumped self-smoothing screeds 6.15 Liability to cracking |
| 16 | 6.16 Damp-proofing ground supported floors 6.17 Eliminating construction moisture |
| 17 | 6.18 Use of admixtures 7 Work on site 7.1 Workmanship 7.2 Protection against the weather 7.3 Installation of the base |
| 18 | 7.4 Preparation of the base to receive a pumpable and self-smoothing screed |
| 19 | 7.5 Services, conduit and trunking 7.6 Construction of joints 7.7 Edge separation joints 7.8 Installation of the screed |
| 22 | 8 Inspection and testing 8.1 Inspection 8.2 Testing of the completed work |
| 25 | Annex A (normative) Method for the determination of the flow value (normative) Method for the determination of the flow value A.1 Principle A.2 Apparatus A.2.1 Measuring ring A.2.2 Stainless steel plate A.2.3 Measuring tape or ruler A.2.4 Watch or clock A.2.5 Container A.2.6 Cleaning equipment (water and cloths) A.3 Procedure A.3.1 Clean and dry the equipment before carrying out the test. A.3.2 Take material to be tested from the discharge end of the pump hose, if material is produced on si… A.3.3 Place the plate on a firm level surface. A.3.4 Place the ring roughly at the centre of the plate. A.3.5 Pour the sample into the ring until the cylinder is full. A.3.6 With a quick, vertical movement, lift the ring up off the plate and allow the sample to spread ou… A.3.7 Measure the diameter of the circle in two directions, approximately at right angles to each other… A.4 Interpretation of results Table A.1 Interpretation of results |
