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concrete foundation


Concrete foundation with step

A reinforced concrete foundation on a grave base is a high-quality foundation option.

The soil is dug out frost-proof (approx. 60-80 cm deep, depending on the region), then the excavation is filled with gravel (grain size up to 35 mm) and compacted. This is followed by an approx. 3-5 cm thick levelling fill with gravel (grain size up to 6 mm), the vapour barrier (plastic sheet with a thickness of at least 150μm) is laid into this levelling fill. The concrete foundation with 1 to 2 layers of structural steel grid is erected on top of this - the thickness of the concrete slab should be approx. 10 - 15 cm.

The stepped foundation pad, with a circumferential step of 2 cm x 7 cm, is an ideal design. The floor profile is attached to the underground using the screws and anchors included in the delivery.

Please note that it is not possible to use the aluminium floor frame for the step-shaped concrete foundation. Furthermore, no application of a sealing compound is necessary for sealing.


  1. Frost-proof excavation of the building site
  2. Set up the gravel base
  3. Fill with gravel
  4. Lay vapour barrier
  5. Pour the foundation

Please see the Biohort foundation plans for the concrete foundation

Shed size

External dimensions of foundation in cm

1A173 x 173

1B

229 x 173

1C285 x 173
1D341 x 173
2A229 x 173

2B

229 x 229

2C285 x 229
2D229 x 341
3A285 x 173
3B285 x 229
3C285 x 285
3D285 x 341
4A

341 x 173

4B229 x 173
4C285 x 341
4D341 x 341

You can find all foundation plans in our download area.

Shed size

External dimensions of foundation in cm

H1257 x 137

H2

257 x 177

H3257 x 217

H4

257 x 257

H5257 x 297

You can find all foundation plans in our download area.

Shed size

External dimensions of foundation in cm

P1257 x 137

P2

257 x 177

P3257 x 217

P4

257 x 257

P5257 x 297

You can find all foundation plans in our download area.

Shed size

External dimensions of foundation in cm

A1177 x 177
A2177 x 217
A3177 x 257
A4177 x 337
A5257 x 177
A6257 x 217
A7257 x 257
A8257 x 337

You can find all foundation plans in our download area.

[Translate to English:]

Hausgröße

Fundamentmaß außen in cm

1155 x 83

2

155 x 155

2A227 x 83

3

227 x 155

4227 x 227
4A299 x 155
5299 x 227
6227 x 299
7299 x 299

Alle Fundamentpläne finden Sie in unserem Downloadbereich.

Alternative: flat concrete plate without step

As an alternative to the concrete foundation with the step-shaped surface, a continuous flat concrete slab can also be poured.

The construction is carried out - except for the step in the foundation - as with the concrete foundation described above with the offset foundation plate.

The aluminium floor frame, available as an accessory, makes it easier to level out any unevenness in the floor and to fit the sealing joint. The aluminium floor plate (lined with 2-3 cm thick XPS hard foam panels) can be installed using the aluminium base frame.


  1. frost-proof excavation of the building site
  2. Set up the gravel base
  3. Fill with gravel
  4. Lay vapour barrier
  5. Pour the foundation

Please also note the above mentioned concrete foundation plans for this option.

Note: These foundation tips are non-binding suggestions. The customer himself is responsible for an appropriate foundation design. Biohort cannot accept any liability for damage caused by insufficiently fastened products.