Insufficient integration of joint plates?

In our new construction project with a developer, we have an external building inspector who is overseeing the whole thing. The developer is building several terraced houses in this row, and after the basement slab was poured, the first defect appeared:

- The execution on site deviates from the requirements of the used joint sheet (FRADIFLEX)
- The sealing sheets are 15 cm wide and must be embedded 3 to a maximum of half their width into the concrete, that is 7.5 cm. Based on the films still attached at the upper area for protection, it is clearly visible that the embedding of at least 3 cm is not always provided.
- This is especially the case at the 4 corners, where significant height differences can be seen.
- In some places, film has been embedded in the concrete.

A few recent pictures:

[ATTACH alt="dsc07783.jpg" type="full"]48151[/ATTACH] [ATTACH alt="dsc07784.jpg" type="full"]48152[/ATTACH] [ATTACH alt="dsc07790.jpg" type="full"]48154[/ATTACH][ATTACH alt="dsc07793.jpg" type="full"]48155[/ATTACH] [ATTACH alt="dsc07814.jpg" type="full"]48156[/ATTACH]

Attached is the excerpt from the purchase contract: "The basement floor slab will be made of watertight reinforced concrete. A perimeter insulation will be installed beneath the floor slab. The basement level will be constructed as a white tank (usage class A). On the outside, in the joint area, a PMB waterproofing (plastic-modified bitumen thick coating) will be applied."

Tomorrow we will discuss this with the site manager and the external inspector. What is the experts’ assessment here? What problems could arise in the long term or can this defect still be corrected in some way?

Hi,

I am obviously late now, but I am still interested in the result of the inspection.
In my opinion, the partially insufficient installation height is not a catastrophe. It is difficult to see from the pictures whether the reinforcement touches the sheet metal. This should definitely be avoided.
If damage occurs there, it can only be prevented from the outside later on. At that time, a resin hose could have been inserted as a precaution.

Your construction description is somewhat difficult in my eyes. The term "white tank" is only meaningful if the WU guideline was agreed upon. This is not apparent here. The statement usage class A likewise. You should check exactly what you are getting.

If you have any further questions, I’ll be happy to help.

Best regards
Jann Stöter