Plaster windows

The plastering of windows is a hot topic for many homeowners, because because of the Energy Saving Ordinance (EnEV) many property owners are forced to equip the facade accordingly with a thermal insulation composite system (ETICS) or to install heat insulation windows with higher insulation values. Inevitably you also come to the topic of plastering windows. Below we have compiled important information for you.

Various reasons for plastering windows

The plastering of windows is an acute issue for many homeowners. Due to the EnEV, more and more property owners must heat their facades, windows and doors accordingly. However, the reasons why windows should be repainted can be very versatile.

  • Facade covered with ETICS and plastered connection to windows
  • new insulating glass windows installed, which must be plastered
  • Re-plaster existing windows and refurbish accordingly

Plan to plaster the entire facade by the window

Even before you start with a single work of the above works, you should always consider the façade, including the windows and doors, as one unit, and align the design to the entire front of the house. This in turn means that you should already install the window after performing RAL. Then build on all the next steps, including the plastering of the windows on.

Plaster window outside

In particular, the implementation of the corresponding principles is important: the window should become denser from the outside in. The outside (facade) is still open to diffusion and only beating rain. This ensures that moisture in the brickwork can always dry out completely. To do this, when plastering the windows, use so-called compribands or cleaning strips. Roofing board (R500) is incorporated into the outer windowsill according to modern construction methods.

Plaster windows inside

In order to get the area around the window inside (the soffit) absolutely tight, a corresponding sealing foil is incorporated under the plaster. But you also have to consider a few aspects when it comes to plastering. Depending on the window material (wood, aluminum or light metal, plastic or a combination) you also use a different plaster, for example a lime plaster.

Requirements for the plaster

Likewise, the consistency of the plaster is important. The thinner the plaster layer should be, the sooner light fiber plaster is recommended. But also keep in mind that there are special masonry plasters that you can use for ETICS.

Step-by-step guide to plastering windows

  • suitable plaster (especially for ETICS, light fiber plaster etc.)
  • as required Compriband, cleaning strips, roofing felt R500 (outside)
  • according to need sealing foils (inside)
  • duct tape
  • drilling machine
  • mixing paddle
  • Mortar or cleaning bucket
  • trowel
  • Putz grater
  • Cleaning strips with cleaning hooks
  • plumb
  • spirit level
  • Cutter knife

1. Preparatory work

Depending on the window and installation technique, some preliminary work may still be necessary. For example, the cutting of polyurethane foam between soffit and window sill. If the window is still to be set, it is also recommended when installing in accordance with RAL (with sealing tapes) to plaster the soffits finely smooth, because this facilitates all further work considerably.

2. plaster windows, direct preparatory work

Glue windowsill, window frames etc. (everything that should not be plastered) generously with a plastic tape.

Depending on how you proceed, you must now attach your guideline and / or the cleaning hooks together with the cleaning strips.

Now, the cleaning strips, Compribänder or the roofing felt (outside) or the sealing film (inside) are applied. Then you can touch the plaster according to the manufacturer's specifications.

3. plaster windows

With the trowel, you now generously apply the plaster and distribute it according to your specifications (guideline, cleaning strips, etc.) accordingly.

4. Rub the plaster

Now you have to wait until the plaster has tightened enough that it is still wet, but does not stick to your fingers. With the wet cleaning rub the surfaces of the plaster smooth.

5. Theses

After drying, you can remove the tapes and cleaning strips. In addition, the plastered windows can now continue to edit (paper, paint, etc.).

Tips & Tricks

If you use wood scraper strips, you should also stick them generously with plastic tape so that the plaster does not stick. Of course, you can use instead of wood trim strips and those made of plastic.

Working in RAL often means that an acrylic or silicone joint is applied under the plaster instead of PU foam. In this case, however, you should bear in mind that these joints are not maintenance-free and must be regularly renewed every few years. Nevertheless, the application (in a RAL window assembly) of such an acrylic or silicone joint may be useful (economical).

The house journal offers you many more articles around your windows. So of course to renovate the window.

Video Board: How to deal with the inner plaster around the window?