Basement Waterproofing Grades

The three "Grades" and "Types" of Waterproofing

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The British Standards Institue's BS 8102:2009 regulations categorise basement waterproofing systems into three different grades (1,2 & 3) and three differestn Types (A,B & C). These grades and types are intended to make a clear distinction between the types of basement waterproofing systems available and the sort of results that can be expected when each is applied.

Grades of Waterproofing

The waterproofing  grade rating , as defined by BS8102:2009, relate to how effective the waterproofing system needs to be. In some instances, such as industrial environemnts, some water ingress will be tolerated. Whereas in other environments, such as domestic basement conversions, no dampness whatsoever can be tolerated. 

The waterProofing Grades
  • Grade 1 – Some water seepage and damp is tolerable depending on the intended use. Car parks etc.
  • Grade 2 – No water penetration is acceptable. Damp areas are tolerable depending on the end use. boiler rooms, workshops etc.
  • Grade 3 – No dampness or water penetration is acceptable – Ventilated residential and commercial areas such as homes, offices, shops etc.

Wise Basement Systems will be able to recommend the appropriate grade of waterproofing for your project and relate that grade to the "type" of waterproofing that will be applied.

Types of Waterproofing

The different waterproofing types, as defined by BS8102:2009, relate to that actual make-up of the waterproofing system used. These range from simple water barriers to integrated solutions and retrofit internal waterproofing systems.

Type A Waterproofing

The Type A Waterproofing grade is defined by The British Standards Institute’s BS8102:2009 (Code of practice for protection of below ground structures against water from the ground) as ‘barrier protection’.

This means a material, such as waterproof cement, is applied that will offer a barrier to water ingress from outside. When applied to basements and cellars this type of waterproofing will often be referred to as basement tanking.

Type-A systems are suitable for a number of different applications including: underground storage rooms, underground car parks or garages, earth retaining walls and swimming pools.

Type A systems is perfect for Grade 1 waterproofing, but may be unsuitable for Grade 2 or 3 waterproofing depending on the circumstances.

You can read the Property Care Associations best practice for Type A Waterproofing by clicking the button below.

Read the PCA Best Practice note on type A waterproofing

Type B Waterproofing

The Type B Waterproofing grade is defined by BS8102:2009 the structure itself being an integral water resistant shell.

This means that any structural waterproofing in a Type B systems is integrated into the structure at the time of construction. Invariably this means a build of reinforced concrete supplemented with a method of controlling water ingress at construction joints (such as a hydrophilic waterbar).

To be classed as a Type B waterproofing system, a basement must be designed within certain strict parameters to ensure it is water resistant.

Type B waterproofing would typically be achieve Grade 2 waterproofing results, but it is very versatile, so this is not necessarily the limit of its application. Your waterproofing contractor will be able to advise further.

You can read the Property Care Associations best practice for Type B Waterproofing by clicking the button below.

Read the PCA Best Practice note for Type B Waterproofing

Type C Waterproofing

The Type C Waterproofing grade is defined by BS8102:2009 as where the structure itself provides the initial resistance against water ingress but also incorporates a drained cavity within the basement structure. The structure will permanently rely on the cavity drainage system to collect groundwater ingress through the structure and direct it to drains or a sump pump for removal.

Modern interior basement waterproofing systems that use cavity wall membrane, drainage systems like WaterGuard or DryTrak and sump pumps would be classed as Type C waterproofing.

Type C waterproofing systems are ideal for achieveing Grade 3 levels of waterproofing.

You can read the Property Care Associations best practice for Type C Waterproofing by clicking the button below.

Read the PCA best practice note for type C waterproofing

a contractor that is wise to waterproofing grades

With years of structural waterproofing experience, Wise Basement Systems understand how to apply basement water proofing systems that adhere to the British Standards Institutes waterproofing grades. Also, as approved Property Care Association (PCA) and British Structural Waterproofing Association members, we have the experience and qualifications to recommend, install and maintain almost any structural waterproofing system below ground level.

Why Choose Wise?

Not only do Wise Basement Systems adhere all the proper rules and regulations, our surveyors are also among the most experienced and qualified in the industry.

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Book a Professional

If you are planning a basement conversion, or just want the underground space in your property to be waterproof, then you need to book a survey with Wise Basement Systems.

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Want to know more?

If you run a business, and feel your staff could benefit from knowing more about the various grades of structural waterproofing, then book a FREE CPD seminar with Wise Basement Systems.

Our CPD (continuing professional development) seminars are conducted by our surveyors on your premises and allow our surveyors to impart their expert knowledge onto you and your staff. Click on the button below and book your seminar today - completely free of charge.

Along with waterproofing grades, our surveyors can cover a range of topics in their CPDs including: The latest advances in basement waterproofing, water management systems, basement and cellar conversion, tanking and more... 

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Speak to an experienced & qualified waterproofing expert

To speak to a structural waterproofing expert about your basement or cellar, call wise Basement Systems today on freephone 0808 256 4538 or contact your local branch.  Alternatively, click to contact an expert online using our contact form.

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