CONVENTIONAL SPREAD FOOTINGS

Commonly this type of foundations is used for masonry columns and walls. After opening the trenches these foundations are built to required depth. Such type of footings is economical up to a maximum depth of 3 m. As these foundations are appropriate depth, they are grouped under shallow foundations.

Given figure shows a conventional spread footing for a wall and another figure shows it for a masonry column.

                              Wall footing                                           Foundation for masonry pier

These footing trenches are opened to required depth before building and the soil is rammed well. Then plain concrete of mix 1: 4: 8 is provided. Its thickness varies in the range 150 to 200 mm. stone masonry footing is built over this bed. It is built in courses each course projecting 50 to 75 mm from the top course and height of each course being 150 to 200 mm. the projections are only one direction In case of wall footing whereas in case of columns, they are both of directions. The projection of bed concrete from the lowest course of foundation masonry is typically 150 mm.