1.

Frame should be attached to basis with pegs, or it should be attached to concrete using added "moustaches".

2.

Basis under doormat has to be even. In case any unevennesses, you have to smooth basis.

3.

In porus you must to install cardial frame , bought in W. W. S. or execute her from square 25mm x 25mm x 3mm for high profile, or 15mm x 15mm x 2mm for low profile.

4.

Square should assemble in such way to horizontal shoulder 25mm harmonize from surface of sbasis, and perpendicular shoulder did not stand over surface of floor.