How can a bar be strengthened
A roof beam reinforcement saves the replacement
How do you strengthen roof beams?
There are several occasions to reinforce the roof beams of a building. The need usually arises from a different use of the building. If, for example, the attic is to be expanded or a solar system is to be installed on the roof, existing components can be overloaded. Even if the roof beam has cracks, renovation is often the only solution.
The most cost-effective measure here is to reinforce the roof beams. It is a technically safe measure that does not require any major interventions in the building fabric. The existing framework, which is too weak, can still be used.
What types of load capacity increase are there?
It can be done using wood or steel components screwed on on both sides. The connection of the reinforcement components to one another is mainly carried out with dowels and screws.
Reinforcement on the top
It is the most classic method for renovating roof beams. The connection relies on fully threaded screws that are screwed in either perpendicular to the direction of the wood grain or at an angle to it.
Reinforcement on the underside
Reinforcement on the underside is rather rare, as the ceiling below would have to be exposed. This is not a problem with steel profiles to reinforce the roof beam. The folded profile is very stable and is screwed on from below.
|Side reinforcement||Wooden straps or steel profiles||Dowels and bolts, dowels, screws|
|Reinforcement on the top||Double a wooden beam||Connection by screwing or toothing|
|Reinforcement on the underside||Steel profiles or steel sheets||Screws|
Alternative to conventional reinforcement methods
Newer methods of reinforcement at the top make use of a wood-concrete composite construction. A structural reinforcement with polymer concrete was developed in a research project by the Bauhaus University Weimar and Bennert GmbH.
A slightly higher formwork on the side is attached to the existing structure. The resulting cavity above the ceiling joist is then filled with a polymer concrete layer.
This procedure has many advantages:
- warped roof beams are given a flat surface
- low construction heights
- light weight
- no slippage, as there is a rigid bond
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