Which Koster Waterproofing System?

Which Koster Waterproofing System?
Koster Waterproofing System used to waterproof basement

Choosing the correct Koster Waterproofing System.

Koster have a fantastic range of waterproofing systems for basements and podium decks. Selecting the correct one is key for a successful waterproofing project and creating a dry basement.

Koster Waterproofing Systems.

We are often asked the question, Which Koster Waterproofing system should i use on my basement project. The answer depends on the basement structure as well as the project reqirements.

Generally – Koster offer 2 types of waterproofing systems:

1- Internal System- to waterproof basement walls, basement floor and buried roofs from the inside

2- External systems – to waterproof the outside surfaces of the basement.

Koster NB1 Grey Waterproofing Slurry

Internal Koster Waterproofing Systems

Internal basement waterproofing systems are normally based on cement and must fully bond to the structure in order to resist water pressure.

Koster NB1 Grey  is the most popular Koster waterproofing system. It is a brush or spray applied migratory crystal slurry that acts as a barrier against water ingress.

Koster NB1 is typically applied to the inside face of concrete walls as well as masonry walls as well as concrete basement floors and the underside of basement soffits.

Koster Deuxan 2C being applied

External Koster Waterproofing System

Here is where the Koster Range of products becomes much larger and potentially more confusing:

Koster Deuxan 2c is a trowel applied external waterproofing and is used for:

Koster Deuxan 2c has excellent crack bridging capability (2mm) but is not UV stable so needs to be protected quickly after application (using a drainage and protection membrane like Delta Terraxx

Koster 21 - Liquid applied waterproofing coating

Koster 21 is a liquid brush or roller applied external waterproofing and is used for:

Koster 21 is UV stable and is trafficable meaning it can be left exposed to foot traffic.

The crack bridging capability of Koster 21 is 0.5mm meaning that it is best used on stable structres or where maintenance is possible.

Koster NB 4000

Koster NB4000 is a liquid trowel appled external waterproofing and is used for:

  • Buried Roofs and concrete podium decks.
  • Waterproofing balconies
  • Waterproofing concrete roofs where the waterproofing layer is to be left exposed.
  • Waterproofing external stairs and steps.
  • External waterproofing of concrete and masonry walls.
  • Linking external waterproofing up to DPC level

Koster NB4000 is UV stable and is trafficable meaning it can be left exposed to foot traffic.

The crack bridging capability of Koster NB4000 is between 2mm and 3.5mm depending on application. Koster NB4000 is fast to cure meaning that the second coat can easily be applied on the same day. In addition Koster NB4000 can be applied during temperatures between 2c and up to 30c.

Koster NB4000 possibly one of the most versatile koster waterproofing systems.

Koster MS Flex Foil is a liquid applied deck waterproofing system.

  • Buried Roofs and concrete podium decks.
  • Waterproofing balconies
  • Waterproofing concrete roofs where the waterproofing layer is to be left exposed.
  • Waterproofing timber decks
  • Waterproofing decks where movement is expected for example block and beam decks.

Koster MS Flex Foil is UV stable meaning it can be left exposed.

The high crack bridging and elongation break capability of MS Flex Foil means that it can be used on a great variety of deck structures.

Although possibly the most expensive of the Koster deck waterproofing systems, Koster MS flex foil can be applied in a single coat thereby reducing the labour cost of the installation.

Koster KSK SY15 bitumen membrane

Koster KSK Self Adhesive Waterproof Membrane

Koster KSK is a self adhesive or “peel and stick” waterproof membrane and is used for external waterproofing.

Koster KSK is used for.

  • Waterproofing below a concrete basement slab. (Blinding layer required)
  • Waterproofing the outside of solid concrete retaining walls.
  • Repair to external waterproofing systems.
For Koster KSK to be effective the surface must be primed using Koster KBE liquid film.
Without priming the membrane will not bond effectively.
Basement Waterproofing Planning

We hope this guide to Koster Waterproofing Systems has been useful. For further technical support, design advice and installation assistance please contact us at technical@drydirect.co.uk

Need help selecting or installing the right waterproofing system?

Let us know our team of waterproofing experts will be happy to help.

 Our Friends at Grindblasters can help with surface prepration and the guys at Capital Waterproofing can help with installation of waterproofing systems.

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