Hello
Last week, our foundation slab was poured, and today I took some measurements.
The house is 10 x 9 m (33 x 30 ft). One side measures the full 9 m (30 ft), but the opposite side is 8.977 m (29 ft 5.5 in), so it is 2.3 cm (0.9 inches) shorter. Is this still within an acceptable tolerance?
Looking forward to your advice.
Last week, our foundation slab was poured, and today I took some measurements.
The house is 10 x 9 m (33 x 30 ft). One side measures the full 9 m (30 ft), but the opposite side is 8.977 m (29 ft 5.5 in), so it is 2.3 cm (0.9 inches) shorter. Is this still within an acceptable tolerance?
Looking forward to your advice.
The foundation slab is usually poured after precise layout marking by a surveyor, with the batter boards and strings/nails still in place. Checking for squareness is quick to do, but it is also the site supervisor’s responsibility to at least verify the layout markings and batter boards for any major discrepancies.
I just reviewed the DIN standard again, and from what I understand, the 24mm (just under 1 inch) is the maximum, so still within tolerance.
Best regards,
Dirk Grafe
I just reviewed the DIN standard again, and from what I understand, the 24mm (just under 1 inch) is the maximum, so still within tolerance.
Best regards,
Dirk Grafe
Knallkörper schrieb:
More important than a 25mm (1 inch) tolerance is that the foundation slab is not only a parallelogram but also a rectangle. THAT is what I would check.Exactly. The fact that a 365mm (14.4 inches) wall at one corner only rests on 341mm (13.4 inches) of the foundation slab won’t cause the house to collapse. Tolerances represent the difference between the plan and reality, which can still exist even with professional workmanship. They are not meant to cause panic among homeowners.
But, as Reinhard Mey beautifully puts it: “Then my eyes fall on the calendar, and I’m struck: It’s only the 12th and Thursday!” — who knows how calibrated the OP’s measuring tool really is…
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