Sealing of window reveal and lintel

Hello forum, the window reveal (that is, to the right and left of the window) must be sealed with compressible tape. What about the window lintel (above)? Does the compressible tape also need to be applied there on the sides?

Yes, and also below.

Yes, and below as well.

Is there a standard or RAL guideline for this?

Instructions for the assembly of these bands are provided by almost all manufacturers.
For example, from WÜRTH

Window sealing: A very complicated matter! I have had 4 of them so far, on each individual window and this with 28 windows. The 4th one is now okay. The complicated thing about it is that there is no DIN standard. There are only recommendations and guidelines, e.g. from the Institut für Fenstertechnik Rosenheim. However, you do not necessarily have to follow them. Unless you have noted it in your contract, which is hardly ever the case. Compressible tape is not necessarily required either (although it is the best solution), what is important is a 3-layer sealing (inside, middle, outside). This must be continuous, so also at the top and bottom. In any case, get a specialist contractor’s declaration for Fenstereinbau und-abdichtung. This should only be carried out by a specialist company. In our case, all 28 windows were installed and "sealed" in 2 days on the 1st attempt, not by a specialist company. The 4th measure, including dismantling, sealing and reinstallation, took 7 working days and cost nearly €7000.