Dowels in the ceiling in the old building

Old buildings and dowels - these are often combinations in which the anger seems preprogrammed. Because especially the ceilings of old buildings can be constructed very differently. Mostly even with materials in which no dowel seems to hold. Often, only the choice of the right dowel is important.

Many old building materials too soft for dowels

Basically, dowels are an excellent invention, which by the way was already patented in Germany in the 1920s. But we would already be one of the main reasons why dowels did not really enforce at that time: the building materials used did not allow the expansion dowels reliable hold.

Put ceilings in old buildings and dowels

It can be a real challenge to put a dowel on the walls of old buildings. However, ceilings are often compounded by the fact that, in contrast to today's prestressed concrete ceilings, they are less stable materials that also had to be very easily connected with each other:

  • suspended wooden ceilings
  • Fülldecken
  • Clay ceilings with beam structure

These are just a few examples of ceilings that are common in old buildings. The filling can be present in any construction and consist of different natural products, which can be summarized as "straw filling".

Spring-loaded dowel for old building ceilings

So-called spring-loaded dowels, also called tilting dowels or hinged dowels, are most suitable. These dowels look like a pole and have at the end to be inserted a wing, which are initially folded. If they are completely inserted into the borehole, they are pulled back a bit. This will fold out the two wings. In the case of a suspended wooden ceiling, these would be the wooden boards, on the inside of which the wings spread laterally.

Chemical injection dowels or liquid dowels as an alternative

Depending on the material in the ceiling, however, a chemical or injection anchor could be the right choice. These dowels are also referred to as liquid dowels. An anchor sleeve is inserted into the bore, then resin mass injected. Now a threaded anchor is inserted and centered. The mass usually takes an hour to cure, then the construction can be charged.

Tips & Tricks

For more information on chemical or injection anchors, see "Embedding the dowels". Note, however, that also when placing dowels in old building dowel sizes. Dimensions and hole diameter are crucial. From plastering the dowel in the ceiling of an old building is rather discouraged.

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