What is Soudatight WP used for?

You use this liquid membrane to create an airtight and waterproof seal around window-to-floor junctions, balconies, terrace windows, foundations, and precast concrete.

How do you apply this liquid membrane?

Apply it undiluted using a flat brush in 2 layers, embedding a reinforcing fleece (such as Soudatextile) between the wet coats.

Can Soudatight WP be plastered over or painted?

Yes, once fully cured, it forms a seamless and elastic barrier that can be plastered or painted over directly.

Does it adhere to damp substrates?

Yes, it adheres reliably to slightly damp and dusty substrates and becomes rainproof after 2 hours.

Is the product ready to use?

Yes, it is a ready-to-use one-component formulation that is free from solvents and isocyanates.

SOUDAL Soudatight WP one-component air- and waterproof membrane in bucket (10 kg) - 155295

Name: SOUDAL Soudatight WP one-component air- and waterproof membrane in bucket (10 kg) - 155295
Brand: SOUDAL
SKU: 08085330
Price: 191.8 EUR
Availability: PreOrder

Supplier number: SOUDAL 155295 | EAN 5411183173897

Recommended Retail Price €197.61

191.80 tax incl.

€158.51 excl. VAT (incl. all environmental contributions)

On order: delivered from 14/10/2026

Ordered before 20:00 - delivered as of 14/10/2026
Free shipping
Delivery by DHL
Delivered from Belgium

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Seamless weatherproofing by Soudal

Practical benefits

Reliable water and airtightness: You create a continuous barrier that resists standing water and driving rain across exterior connection joints.
Ready to use formula: The single-component liquid membrane allows you to apply the product directly with a brush without mixing.
Elastic and vapour permeable: It delivers durable crack bridging while remaining open to vapour diffusion and ready for plaster or paint.

In a nutshell

The right choise for

With the Soudatight wp liquid membrane from Soudal, you quickly create a seamless, elastic barrier against air and water on demanding exterior joints. This ready-to-use single-component formula applies easily undiluted with a flat brush in two layers without any prior mixing. It is ideal for sealing window-to-floor junctions around terraces and balconies, foundation connections, and precast concrete panels. The vapour-permeable membrane bonds reliably to slightly damp or dusty substrates and becomes rainproof after just two hours. Once cured, it effortlessly bridges cracks and can be directly plastered or painted over.

Product information FAQ

€191.80

tax incl.

Key features according to our expert

EUH-statements: EUH208; EUH210
ADR packing group: Not applicable
ADR class: Not applicable
Weight: 10 kg
UN number: Not applicable
Physical state: Liquid
Flash point: >100 °C
Packaging: Bucket

Product description:

Soudatight WP is a one-component liquid membrane based on hybrid polymers, specially developed for waterproofing exterior window-floor joints (such as in balcony and terrace windows). Also suitable for waterproofing the reveal side in insulated precast concrete panels. After curing, Soudatight WP forms a seamless, elastic, vapour-permeable and waterproof membrane, which can be plastered and painted over. The product should be applied in 2 layers, with Soudatextile between the two layers.

Properties:

Waterproof
Resistant to standing water
Vapour open
Rainproof after 2 hours
Airtight
Ready to use: one-component system
Good crack bridging
Good adhesion on slightly damp and dusty substrates
Solvent- and isocyanate-free

Applications:

For watertight finishing of window-floor connections such as in terraces and balconies, plinth connections and foundations (above ground), the day edges in insulated precast concrete panels and connection joints between precast concrete elements.

Instructions for use:

Soudatight WP can be applied directly to the surface with a flat brush. Apply the coating undiluted and evenly in a layer at least 1 mm thick (1/2 to 2/3 of the total layer thickness). Place Soudatextile in the still wet layer, avoid folds and air inclusions and press Soudatextile firmly into the wet layer with a brush or a putty knife. Multiple layers of fleece should overlap by 3-5 cm. Cut reinforcements for corners or penetrations in advance and apply them before the longer flat pieces. Apply a second layer of Soudatight WP (1/2 to 1/3 of the total layer thickness) on top of Soudatextile, preferably 1 cm wider than the fleece itself. The use of masking tape (on the window frame) is recommended, remove the tape shortly after applying Soudatight WP for curing.

Supplemental hazard information

EUH208: Contains ... (see safety data sheet). May produce an allergic reaction.
EUH210: Safety data sheet available on request.

All Features

Euh-statements: EUH208; EUH210
Adr packing group: Not applicable
Adr class: Not applicable
Weight: 10 kg
Un number: Not applicable
Physical state: Liquid
Flash point: >100 °C
Packaging: Bucket
Colour: Grey
Packaging form: Bucket
Product content: 10 kg

Brand SOUDAL
08085330
EAN 5411183173897
Supplier number SOUDAL 155295

Frequently asked questions about this product

Answered by specialists

What is Soudatight WP used for?: You use this liquid membrane to create an airtight and waterproof seal around window-to-floor junctions, balconies, terrace windows, foundations, and precast concrete.
How do you apply this liquid membrane?: Apply it undiluted using a flat brush in 2 layers, embedding a reinforcing fleece (such as Soudatextile) between the wet coats.
Can Soudatight WP be plastered over or painted?: Yes, once fully cured, it forms a seamless and elastic barrier that can be plastered or painted over directly.
Does it adhere to damp substrates?: Yes, it adheres reliably to slightly damp and dusty substrates and becomes rainproof after 2 hours.
Is the product ready to use?: Yes, it is a ready-to-use one-component formulation that is free from solvents and isocyanates.