There are 3 types of waterproofing which can be used when creating a new build basement which, when applied-installed must conform to British Standard 8102:2022

TYPE A (BARRIER) PROTECTION

Protection against water ingress by a separate barrier system.

1. Waterproofing Layer

2. Wall

3. Concrete Floor

4. Loading Coat

TYPE B (STRUCTURALLY INTEGRAL) PROTECTION

Protection against water ingress which is provided by the structure.

1. Water Resistant reinforced wall and slab

2. Waterstop – internal or external, as required

3. Waterstop required at wall and slab junction & all joints

4. Piled wall may require facing

5. Concrete/Steel piled wall

6. Waterstop following profile of wall at the junction

7. Water-resistant concrete floor or slab with added barrier

TYPE C (DRAINED) PROTECTION.

Type C (Drained) protection. Protection against water ingress into useable spaces is provided by the incorporation of an appropriate internal water management system.

1. Inner Skin

2. Cavity drain membrane

3. Pump

4. Drainage channel connected to discharge point

5. Sump

6. Wall Cavity

7. Internal Block Wall

8. Access point to drainage

9. Reinforce concrete/steel pile wall

10. Waterstop at the junction to follow wall profile

11. Drainage channel

Systems can be combined as follows:

Type A and Type B

Type A and Type C

Type B and Type C

Although structures with type B protection are designed to be water resistant, additional waterproofing systems may be applied internally or externally to control water vapour movement where appropriate.

One example is where structural steels or lintels may be planned as part of the basement construction which requires type C protection (drained protection) and need to be installed into walls that are below ground (earth retaining). Steels such as these need to be correctly detailed to prevent water ingress at this vulnerable point. To isolate the ends of the steels we factor into the design a bespoke polymeric joist boot. This product creates full isolation to the ends of the steel from the retaining wall which can then be detailed as per manufacturers recommendations when installing the internal cavity drained membrane system (Type C).

Any client recommendations and preparation work that we feel may help during the project to aid with installation and maintenance of a successful waterproofing system. To carry out successful installation or application of a Waterproofing Systems there will some preparation work that needs to be carried out prior to our arrival. This will be listed in this section of the report.

Should an internal cavity drain system be specified which incorporates a sump pump station there will be contact details included here to PPS (packaged pump systems) who maintain and service all the pumps which we install. This is an essential part of a type C system.