Cover a foundation yourself

With the foundation formwork already begins the practical construction, in which you must place the highest value on accuracy. It decides whether your foundation is exactly horizontal and made to measure or even makes the subsequent construction of a kit even impossible.
Your self-scoring work refers to the strip foundations and the base plate.
For the scarf work, you need inexpensive, unpolished boards about 12 × 2.2 cm and as long as possible and also squared timbers approx. 5x4cm. The tools are a circular saw and a foxtail, a miter, a cordless screwdriver, a ruler, a 15-meter tape measure and, if possible, a leveling device (can be borrowed from a hardware store).

Step 1: the preparation

Cut out all strip foundations according to the dimensions in your foundation plan, lay any drainage pipes and close these trenches again.

Step 2: Defining the corner points

Their foundation formwork consists in exclusive strip foundations of an outer and an inner formwork according to the thickness of the strips. The inner formwork is omitted with a continuous floor plate.
Using the tape measure or preferably with the leveling device, measure the outer corner points of your foundation and insert a square timber deep into the ground. Use the thickness of your formwork boards. Use the tape measure to check that your foundation is at a right angle by measuring the two diagonals. They have to be exactly the same.
Stretch a string on the long sides of the foundation and hammer in more squared timbers at a distance of about 50 cm.
From the inside, screw the formwork boards horizontally and at the same height as the finished foundation. Make the entire outer formwork and then, if necessary, the inner one.

Step 3: support

The filling of the concrete develops enormous pressure forces. Support your foundation formwork with bevelled squared timbers, which are also secured at the lower ends with square timbers. Better attach extra supports before your formwork moves during concreting. Check constantly that your formwork boards are still exactly in alignment, dimensional accuracy and horizontal.

Now concreting can take place.