Welded membrane (G 200 S4)
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Waterproofing floor slab with welded membrane: reliable protection against moisture
Waterproofing the floor slab with a welded membrane is a highly reliable method of permanently protecting your building against rising damp from the ground (in accordance with DIN 18533). This protective layer under the screed structure is particularly essential for buildings without a basement. The process, in which bitumen sheets are fused into a dense, homogeneous surface using heat, requires precision and specialist knowledge. As your experienced specialists for screed preparation and waterproofing technology, operating throughout Germany, we explain the professional installation of this special welded membrane for floor slabs.
Why welded sheets for floor slab waterproofing? The advantages
Compared to other methods, floor slab waterproofing with a welded membrane offers decisive security:
- Maximum seam security: Welded seams form a tight, permanently sealed connection - a major advantage over pure adhesive joints below ground.
- High robustness: quality polymer bitumen membranes are mechanically resilient and resistant to damage.
- Proven longevity: Correctly installed welded membrane waterproofing of the floor slab protects your foundation for decades.
Which welding membrane for the floor slab? Material selection
The question of "Which waterproofing membrane to use for floor slabs?" is central. We use high-quality polymer bitumen welding membranes with robust carrier layers (glass fleece or polyester fleece).
- Common specifications: A frequently used welding membrane for floor slabs is G 200 S4 (glass fleece backing, 4 mm thick). Alternatively, even more robust EKV membranes (polyester backing) are often used.
- Selection: The exact choice of material depends on the planning specifications and the specific requirements of DIN 18533 for the respective load case of moisture stress.
The process: Waterproofing the floor slab with welding membrane step by step
A welded membrane is laid precisely on the floor slab:
- Substrate preparation: The concrete slab must be load-bearing, clean, dry and level. The bitumen primer is essential for optimum adhesion.
- Lay out and align the sheets: Lay out the first sheet accurately with sufficient overlap (at least 8-10 cm).
- Welding: The entire surface of each sheet is welded to the substrate by metered heating using a propane gas burner.
- Seam welding: Absolutely critical: Careful welding of all seams and joints up to the visible bitumen outlet for a homogeneous connection. This ensures that the floor slab is securely sealed by the welded membrane.
- Connections & elevations: Tub-like, tight design of all connections to walls, supports, etc. in accordance with the standard.
- Second layer (optional): For maximum safety, a second layer of welded membrane is often applied to the floor slab with staggered seams.
Quality features & critical details during processing
The success of floor slab waterproofing with weldable membrane depends on the care taken:
- Perfect substrate preparation.
- Absolutely tight seams and connections.
- Professional burner control (enough heat for bonding, but no material damage).
- Protection of the finished seal.
- Qualified personnel with experience in bitumen membrane welding.
Cost overview: Floor slab waterproofing welded membrane costs
The costs for this sealing method are higher than for simple foil solutions, which is due to the material and the professional welding work. Factors for the price per square meter include the size of the area, the condition of the substrate, whether it is laid in one or two layers and the number of details. It is an investment in maximum safety and durability. An individual offer is required.
Your nationwide expert for welded membrane waterproofing on floor slabs
If you are looking for a reliable company to seal your floor slab with a welded membrane:
- We offer specialized expertise for this technique as part of screed preparation.
- Our teams know how to weld bitumen membranes professionally and safely.
- We work strictly in accordance with DIN 18533.
- We offer our service reliably nationwide.
Conclusion: A permanently dry floor slab with a welded membrane
Sealing a floor slab with bitumen membranes is an extremely robust and safe method of protecting against rising damp. The quality of the workmanship, especially the seams, is crucial for long-lasting function.
Safe sealing of the floor slab? We create the basis for your screed!
Contact us for advice and a quote for the professional sealing of your floor slab with welded membrane as part of the screed preparation - nationwide. By phone, e-mail or WhatsApp.
Frequently asked questions (FAQ)
Is the welding of bitumen membranes safe?
Yes, when carried out by trained specialist personnel in compliance with all safety regulations (especially fire protection), it is a very safe method for creating permanently tight connections.
How long does a welded membrane seal on the floor slab last?
Very long. With professional installation and the use of high-quality membranes (such as G 200 S4 or EKV), a service life of several decades can be assumed, often as long as the building itself stands.
Can welded sheets also be bonded (KSK sheets)?
Yes, there are cold self-adhesive membranes. However, welding often offers an even more robust and fault-tolerant seam connection, especially for components in contact with the ground.
Does the concrete always have to be primed with bitumen primer?
Yes, a system-compliant bitumen primer is essential for optimum adhesion of the welded membrane to the concrete of the floor slab.
What goes on top of the finished waterproofing membrane?
A protective and sliding layer (e.g. PE film) is laid directly on the floor slab welded membrane. This is followed by the insulation and then the screed.