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wanderjupp13 Dec 2015 16:19Our offer states that a drainage system will be installed. However, we have now noticed that no flushing chambers were included. From what I understand, these are required to meet the DIN standard. The contractor is now asking for an additional €2000, arguing that they are not necessary and that he has never built this way before.
What is correct in this case? With or without flushing chambers?
Best regards, Johannes
What is correct in this case? With or without flushing chambers?
Best regards, Johannes
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wanderjupp13 Dec 2015 20:16There should be 5 pieces plus installation.
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Sebastian7913 Dec 2015 22:31Without flush chambers, it’s not a proper drainage system, as the pipes will eventually get clogged.
Is this even allowed in your area?
By the way, the price seems reasonable...
Is this even allowed in your area?
By the way, the price seems reasonable...
Whether drainage is necessary at all depends on the water load case from the soil report in connection with the building design and the site conditions. You should review this information first.
The implementation of drainage systems is regulated by DIN 4095 and is not subject to the contractor’s discretion. For example, drainage pipes must be accessible for inspection. It must be possible to flush the pipes at every change of direction, such as at building corners. For this purpose, flushing and inspection shafts with a diameter of at least DN 300 must be installed. Makeshift solutions should be avoided. Improperly installed building drainage can have the opposite effect and cause moisture damage to the structure. Drainage water generally must not be discharged into the sewer system but only into a receiving water body (stream) or infiltrated on the property. This requires a soakaway pit or a soakaway trench, whose drainage capacity must also be planned and verified, for example by an infiltration test included in the soil report.
DIN 4095 should be considered together with the waterproofing measures according to DIN 18195. DIN 4095 describes the components and criteria of a proper drainage system in building construction. It requires verifiable performance criteria and proof of the suitability of materials—for both standard installations and exceptional special cases. Where DIN standards and quality guidelines exist, materials must comply with them. DIN 4095 provides an example of a standard case for drainage in front of walls, to simplify calculations and dimensioning for planners when conditions are straightforward.
If the contractor behaves in this way, you should immediately consult an independent building expert or architect who can review the—hopefully planned—measures and assess their consistency. Statements like “… we have never done it that way before …” or “… that’s how we have always done it …” are often the first sign of a serious construction defect.
The implementation of drainage systems is regulated by DIN 4095 and is not subject to the contractor’s discretion. For example, drainage pipes must be accessible for inspection. It must be possible to flush the pipes at every change of direction, such as at building corners. For this purpose, flushing and inspection shafts with a diameter of at least DN 300 must be installed. Makeshift solutions should be avoided. Improperly installed building drainage can have the opposite effect and cause moisture damage to the structure. Drainage water generally must not be discharged into the sewer system but only into a receiving water body (stream) or infiltrated on the property. This requires a soakaway pit or a soakaway trench, whose drainage capacity must also be planned and verified, for example by an infiltration test included in the soil report.
DIN 4095 should be considered together with the waterproofing measures according to DIN 18195. DIN 4095 describes the components and criteria of a proper drainage system in building construction. It requires verifiable performance criteria and proof of the suitability of materials—for both standard installations and exceptional special cases. Where DIN standards and quality guidelines exist, materials must comply with them. DIN 4095 provides an example of a standard case for drainage in front of walls, to simplify calculations and dimensioning for planners when conditions are straightforward.
If the contractor behaves in this way, you should immediately consult an independent building expert or architect who can review the—hopefully planned—measures and assess their consistency. Statements like “… we have never done it that way before …” or “… that’s how we have always done it …” are often the first sign of a serious construction defect.
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