Why do the plinth masonry on the foundation?

Always wondered what to do on top of the foundation brickwork?

The answers to this question that I have heard or seen:

1. Increase the height of the foundation.

But Masonry has high strength characteristics comparable to concrete? Why not cast the same concrete ribbon on top of a monolithic foundation, if not filled in once the desired height? Concrete has a low hygroscopicity as compared with a brick, greater strength. Pour into the mold it easier than even to lay bricks. What kneading solution for masonry, concrete itself that - the complexity of virtually identical.

At its foundation, poured concrete slab, I strip for raising the height of the foundation. But to use the bricks for this purpose - the very idea did not come.

2. Align the foundation on the horizontal level.

Pour the foundation with a few centimeters a running start on the corners still need to try. This is possible if you do not set the level of formwork, or it slipped during the pouring of concrete. This is still possible in the construction of foundations, with large areas, lengths of the sides.

Therefore, when high-quality formwork installation run on the corners in the basement height is no more than 1-2 cm, well, the maximum - 3 cm. And the horizontal level of the masonry blocks can align solution when laying the first row.

Brick is still bridged and the cold, in contrast to the wall materials with better heat-saving characteristics. Its sure to insulate the outside.

3. Plinth brick takes on the part of the strain

If the foundation has a margin of strength, as opposed to frost heave or sagging, the layer of bricks on it - unnecessary. Masonry has high strength. Of course, can somehow be redistributed microstrain masonry. But a clear answer, I have not found in this issue.

4. Masonry on the foundation - masonry waterproofing layer

It is the most common response. But bricks - much more hygroscopic than the wall materials on the basis of concrete, even aerated concrete (eg, concrete). It absorbs water faster and more.

And what will happen with a brick after he gets into his structure of water, look at these photos:

Masonry, if we allow it to become wet for several freeze-thaw cycles - is destroyed. It destroyed faster than any other wall material.

There are many such examples. Concrete blocks are integers, since have a much lower water absorption.

Forumhouse on this topic appeared. All agreed that doing so is not necessary. And why did all this before - there is no clear answer.

For waterproofing of walls of the house from the foundation is sufficient to use roll bituminous waterproofing. Brick is absolutely unnecessary for this purpose.

My opinion why this technique has remained in the building - a principle to follow the example of others. It is so built our parents and grandparents and neighbors. And many continue this tradition, not realizing the absurdity and getting the extra time and cost. But sometimes problems with the structure.

Read more: Manufactured forms for casting concrete fence decorative covers

Photos taken from the Yandex service. Pictures

***

Subscribe per channel, introducing it in the browser bookmarks. There is a lot of useful information and interesting stories