Make wall breakthrough yourself

Create wall opening - according to plan

Make wall breakthrough yourself: make

For larger renovations and conversions often comes up with the idea of ​​an additional door, an additional window or a practical passage. Most of the time, however, there is a wall in the way - it has to be a breakthrough. This is in the practice of home improvement fairly easy to carry out, however, a lot of things such as the static of the house, possibly running in the wall lines and other building codes must be observed in advance.

A wall breakthrough in load-bearing walls is no small matter and represents an interference with the statics of the house. Therefore, should before the execution exactly the blueprint of the house studied and, in cases of doubt, a specialist firm. Any consequential damage is almost always more expensive than the resulting craftsman's costs. Non-load-bearing walls are not always easy to identify - but the features on which a non-load-bearing wall can be recognized will be explained later. In such walls, a breakthrough is usually not a major problem.

Yet: Caution is advised. All important information on wall and wall breakthroughs are compactly summarized in this article.

Create wall opening - according to plan

The Careful planning is the only protection against expensive consequential damage in the case of a wall breakthrough. Therefore, a construction plan of the house or apartment should be consulted before starting work. If this is not available in the owner's own documents or in the documents of the homeowner, plans can usually be viewed in the responsible building inspectorate. In old houses from the time before the Second World War or in the territory of the former GDR, however, there are certain archiving problems: not infrequently bombing or the political system change have destroyed plans. If there is no plan, a structural engineer or architect must be consulted in any case. Otherwise, the house can be brought into immediate danger of collapse by the wall opening!

How do you recognize a load-bearing wall?

Load-bearing walls are not easily distinguishable from non-load-bearing walls for do-it-yourselfers. There is one sure rule though: Almost always the outer walls of houses are supporting, i. These walls may only be broken after careful planning and with great care. The possible complications increase here with the size of the breakthrough: For the exit of an extractor hood or a small bathroom / toilet window, the risks are lower than for a front door.

Non-load-bearing walls can be recognized by the following features:

  • Hollow sound when knocking: These are drywall. This would be built from a steel / wooden scaffolding and plasterboard. The static is usually not a problem here, but the supply lines: Neither electricity, nor water nor gas pipes may cross the planned breakthrough. While power or communication lines can still be relocated relatively easily, the laying of water and gas pipes is easily very expensive. Maybe you should think about another place here. Otherwise, an installer must redirect the lines.
  • For masonry walls, even those made of aerated concrete blocks, the thing is already difficult. Basically, here: In new buildings from about the 1990s, load-bearing walls are only allowed from a thickness of 11.5 cm. However, this applies only to the pure masonry, not for the entire wall with plaster, wallpaper or other wall coverings. In old buildings, especially from before 1970, caution is always required: load-bearing walls can also be made narrower here. In case of doubt, only the gear to the professional.
  • Most likely are walls wearing from a thickness of 17.5 cm, about it anyway. In any case, a professional must be called in here.

Methods for the breakthrough

The easiest method for a wall breakthrough are certainly hammer and chisel - but this can take a long time and is very, very laborious. A better variant here is the hammer drill, the brand name after "the thick Hilti" dar. Here, however, must be taken to ensure that when using this heavy equipment not destroyed more than necessary.

A slightly more elegant method is cutting with large angle grinders These can be equipped with diamond discs to easily cut the wall. This works well with plasterboard and lightweight blocks of aerated concrete, it is somewhat more laborious in conventional sand-lime brickwork. For the surrounding wall breakthrough, this approach is in any case gentler. However, there may be difficulties with metal reinforcements in the walls.

For small, round breakthroughs, For example, for exhaust ducts of cooker hoods, the use of a core drill is suitable. This drill, more like an industrial diamond tube, cuts a hole in the wall and retains the cut core. So much less dirt is caused, also the work is done much faster. Core drilling machines can be hired from the well-stocked hardware store. In case of doubt also applies here: ask a specialist!

Practical preparations for the wall breakthrough

Make wall breakthrough yourself: breakthrough

Location of lintel and columns

A breakthrough, no matter what type of wall, makes one thing special: A lot of dirt. Therefore, the construction site should first be carefully sealed off from the rest of the house by means of films and adhesions. The fine dust, which inevitably arises, otherwise settles in the entire house and is later very bad to remove.

Subsequently will the area to be breached is marked on the wall. At this time, the supply line and static test must already have taken place!

When marking is to pay attention to the length and width of the door to be used, the window or just the passage be sized more generously. The intermediate space is later filled with building foam or cement, in windows through the soffit. In the case of load-bearing walls in particular, a fall must be pulled in following the breakthrough, and depending on the statics and size of the opening, lateral supports may also be required. These are to be included in the planning of the dimensions.

Make wall breakthrough

The real breakthrough is, after the extensive preparations, not particularly difficult. With the tool of choice, more or less determined within the auszustemmenden area. The following must be observed, depending on the method.

Method 1: the cutout with the angle grinder

Here is "simply" cut out the wall along the drawn line. Simple is therefore in quotes, because this can be quite cumbersome depending on the wall material. Several diamond wheels should be ready for this purpose. The piece of wall standing in the middle is then either checked (!) Overturned or removed by further cuts, piece by piece.

Method 2: Wall breakthrough with the hammer drill

Here too will proceeded along the section, just a little more unsubtiler. First the plaster is cut off with the chisel, then a hole drilled with the drill along the marked line about every ten centimeters. Depending on the type and strength of the wall, the distances can also be reduced or increased. Then the masonry between the holes is tackled with the chisel. The remaining remnants are, as when cutting, overturned controlled or slowly removed by further drilling and chiselling.

Method 3: Hammer and chisel

Anyone who has ever had to dig a hole in a brick wall will certainly not choose this method. A gas concrete wall, however, can also be defeated on the old-fashioned tour, this of course saves acquisition and borrowing costs.

Method 4: The core hole for small breakthroughs

With a core drill are Small and especially round breakthroughs the easiest to produce. After passing through the pipe or pipe, the core hole is filled with foam, sealed and thus insulated against heat and moisture.

Fall in, depending on the wall

A fall is compulsory for breakthroughs in load-bearing walls, but it can also make sense in non-load-bearing masonry. The fall deflects the gravity from above into the lateral masonry. For non-load-bearing walls, it is also a firm anchor point for the cladding.

The fall must be fed in absolutely horizontally, The installation is usually done with quick cement. This binds very quickly and has a high initial liability. Before dressing, the cement should be able to set around the fall according to the manufacturer's instructions. Then you can proceed to the next step.

Dress the wall opening

After breakthrough, the debris is first removed. This can usually be disposed of inexpensively at the construction or recycling yard of the municipality. Then the fine work is tackled: The cladding of the opening can either be plastered or clad with dry construction elements. When installing a door or window building foam is used to close the gap anyway, this also install more in the articles window or install door frames.

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