Sealing of slab under load case of pressing water

Hi,

in load case W.2-1E, the fully welded PYE PV 200 S5 on the base plate is basically state of the art. Under the masonry, a layer of G 200 DD is traditionally laid as a cavity barrier. But: this is not welded to the surface waterproofing, rather it lies loosely to be able to absorb movements. The surface waterproofing runs under the wall, if possible, otherwise it should be neatly finished each time so that no water gets behind the barrier layer. Is it specified in detail whether you have a bonded or loose masonry bed? Because that could still influence the wall structure.

Good luck!

I therefore conclude that the statement of the one company was correct. Completely weld the base plate and place another layer of G 200 DD under the masonry. But what is the purpose of the [Mauersperrbahn] here, is the sealing by the surface sealing not sufficient? Regarding the sheets, a PYE 200 S5 should be sufficient, does it make a difference whether polymer or elastomer? Despite intensive research, I was unfortunately unable to find detailed sheets for the execution.

Hi,

the wall barrier membrane G 200 DD beneath the masonry is more than just redundancy. It separates capillary rising moisture from the concrete from the masonry itself. The surface sealing protects against pressing water, but the standard nevertheless explicitly requires the horizontal barrier membrane as a moisture barrier within the rising wall. It thus complements the sealing beneath the footing. The difference between polymer and elastomer bitumen is rather to be seen in the application area and long-term flexibility. Do you know how exactly the system compatibility between the membranes is specified by the manufacturer, i.e., whether both products are coordinated with each other?

Now I have to ask again because the principle is still not entirely clear to me. So the masonry barrier membrane is not on the surface sealing but normally lies on the base slab? Both membranes are from the same manufacturer. If necessary, I would ask again how the detail is designed, as unfortunately I still cannot find any drawings.

Hi,

with your inquiry, you pinpoint the typical detailing problem. The wall waterproofing membrane usually lies directly on the base slab before the masonry is erected, regardless of the surface waterproofing. It is important that the surface waterproofing extends as far as possible beneath the rising masonry and is tightly connected at the transition, but not rigidly connected to the G 200 DD. The idea is to stop capillary rising moisture, independently of protection against pressing water.

Good luck!