Waterstop is used for construction or expansion joints and for internal or external waterproofing in concrete structures according to British Standard 2571, which are subject to continuous or occasional loads from pressurized and non-pressurized water.
A BS-type waterstops are designed for internally installed construction joints that are constructed in accordance with in accordance with BS 2571. Mounting clips are also available for installing waterstops for internal joints.
| Type | a | b | Rolls |
| A BS-140 | 140 | 40 | 25. |
| A BS-200 | 200 | 70 | 25m. |
| A BS-240 | 240 | 80 | 25m. |
| A BS-300 | 300 | 100 | 25m. |
