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Chapter 2 · Lesson 2.5LW+ Admixture
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01 Inside

Admixture · dosage · water resistance

LW+ works inside the mix.

LW+ is mixed into concrete, mortar or plaster. It improves water resistance and workability inside the mix.

Adding LW+ does not mean every other waterproofing layer can disappear. It works inside the mix; a membrane or joint treatment does a different job.

Integral admixture inside concrete compared with a membrane and joint treatment
Separate the jobs

02 Boundary

One measure does not erase the others.

With LW+, an integral liquid waterproofing admixture is added at a specified dosage. Without it, correctly designed concrete can still perform well when properly protected.

Inside mix

LW+ admixture

Supports water resistance, workability and mix performance depending on the product.

At surface

Membrane / coating

Forms a dedicated barrier where exposure and detailing demand it.

At discontinuity

Joint detail

Treats places where construction breaks the continuity of the material.

Execution

Batching & curing

Specified dosage, correct mixing and curing remain essential.

Read the strategy

03 Spec

Ask what changes if the admixture is removed.

The issue is not “below LW+.” It is whether the concrete and waterproofing strategy are complete without it.

Ask before approval
Which product, at what dosage, in which mix?
  • Which concrete, mortar or plaster receives it?
  • How is dosage controlled on site?
  • Which membranes and coatings remain required?
  • What changes in the water-resistance strategy if it is removed?
Test the boundary

04 Check

Do not collapse the system into one additive.

An admixture, surface barrier and joint detail work in different places.

If LW+ is added, can all other waterproofing details automatically be removed?

Choose the answer that preserves the whole water-resistance system.

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