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Pillar in Concrete Foundation

wooden cabin Candy
wooden cabin Candy
Small cabin Candy

Materials for timber foundation

  • Concrete (binder/sand/gravel/water) or complex dry concrete mix
  • Rocks
  • Timber – 2“x2“ / 100×100 mm or round timber pieces
  • Basic metal fasteners

Pillar in concrete foundation method

The Pillar in concrete method of wooden foundations is recommended especially for buildings with their first floor elevated, located in areas with waterlogged soil or for sloping site house designs.

the front porch rim joists
Example of pillar in concrete foundations, building of cabin Bettie in Indiana
surveying pillar in concrete foundations
Pillar in concrete foundation process: holes were dug into the ground, wooden piers put into them and leveled with battens, concrete was poured into and now it is drying
For more information about this or other types of DIY foundations, refer to this BOOK!

A big advantage of the method is that wooden columns set in concrete prevent the wood from rotting due to ventilation or vapor coming from a soil moisture.

This effect can be enhanced by impregnating the pillars, for example with bitumen coating. Good quality hard wood with dense growth rings such as oak, larch or ash tree further helps to secure better quality of the foundations.

Pillar in concrete method is also advantageous for building in areas where soil contains a big amount of clay, which causes it to react to wet or dry weather conditions by expanding or contracting. That creates an additional pressure on the foundations.

Therefore solid pit bottom and strong support of pillar from below are very important, so concrete together with bottom fortification made of rocks are used. Moreover, because of their resistance to changing level of moisture, they help to prevent cracks, breaks or other harmful issues cause by the expansive soil.

pit for DIY foundations for wooden cabin
a) To begin the construction of Pillar in concrete foundations, you need a pit approximately 20” / 500 mm deep and 2” / 300 mm wide.
rock fortification of the pit, pillar in concrete foundations
b) It is very important to fortify the bottom of the pit with rocks, as the moisture around will not cause their movement or expansion. Use concrete or cement mix to strengthen them.
pouring concrete DIY wooden foundations
c) Once this is done, you can prepare and adjust the impregnated wooden pillars in the right position and then pour the concrete over them.
wooden foundations floor joist
d) The last step now is connecting the floor joist, using for example a metal fastener to hold it in place.

This method of foundations is definitely suitable for DIY builders or anyone seeking low-cost solutions for their constructions. Among our offer of tiny houses and cabins, it is recommended way of building for example for Candy, Louise, Cheryl or Ginger.

Book about foundations and other parts of construction

To learn much more information about tiny houses, cabins, sheds and different types of low-cost DIY and wooden constructions, refer to the How to build a tiny house book.  You can order your printed or electronic version anytime right HERE.