Hello,
it is clear that a sealing tape suitable for the purpose should be applied from the frame to the window.
Therefore, my question: the window has a mullion (see photo). Is it better to use one sealing tape or two tapes that are then applied on both sides of the mullion?
Thank you
it is clear that a sealing tape suitable for the purpose should be applied from the frame to the window.
Therefore, my question: the window has a mullion (see photo). Is it better to use one sealing tape or two tapes that are then applied on both sides of the mullion?
Thank you
B
Bausparfuchs31 Jan 2023 19:32As always, there are misconceptions here.
There is a standardized RAL installation method for windows, and expanding foam has no place in it. If my window installer showed up with expanding foam, he would be sent home immediately.
This installation method has existed not just for a few months but for many years. The corresponding compression tapes are available in various versions for every imaginable window recess.
The problem, as always, is cost. Naturally, it is much higher than using expanding foam. But even the best windows are worthless if they are not installed properly. That is what really matters.
The compression tape also includes a window connection tape, which is vapor-permeable on the outside and not vapor-permeable on the inside. This connection tape is then embedded in the plaster.
Expanding foam is not completely excluded; however, the sealing and sound insulation differ greatly, like day and night. People buy windows at exorbitant prices and then try to save a few dollars on installation costs.
At one of my projects, I once hired a carpenter to install the windows. That was a complete failure. I ended up installing the windows myself. That way, I don’t have to get upset about poor workmanship.
By the way, every proper mason plaster the window reveals before window installation. Why not?
There is a standardized RAL installation method for windows, and expanding foam has no place in it. If my window installer showed up with expanding foam, he would be sent home immediately.
This installation method has existed not just for a few months but for many years. The corresponding compression tapes are available in various versions for every imaginable window recess.
The problem, as always, is cost. Naturally, it is much higher than using expanding foam. But even the best windows are worthless if they are not installed properly. That is what really matters.
The compression tape also includes a window connection tape, which is vapor-permeable on the outside and not vapor-permeable on the inside. This connection tape is then embedded in the plaster.
Expanding foam is not completely excluded; however, the sealing and sound insulation differ greatly, like day and night. People buy windows at exorbitant prices and then try to save a few dollars on installation costs.
At one of my projects, I once hired a carpenter to install the windows. That was a complete failure. I ended up installing the windows myself. That way, I don’t have to get upset about poor workmanship.
By the way, every proper mason plaster the window reveals before window installation. Why not?
X
xMisterDx31 Jan 2023 20:20Tolentino schrieb:
By the way, the compressible sealing tape (multifunctional sealing tape) we used didn’t care if the wall opening was 10mm (0.4 inches) at the top, 20mm (0.8 inches) in the middle, and 15mm (0.6 inches) at the bottom. It can fill up to 50mm (2 inches) without any problems.
When it’s cold, it might just take longer. Yes. You did it that way because you don’t mind that this material costs four times as much as one that expands to 15mm (0.6 inches).
For the window installer who buys this in large quantities and has to make a living or pay employees, it’s not the same—they save wherever they can.
And then suddenly it’s actually 17mm (0.7 inches), not 15mm (0.6 inches). Just like that, the property owner ends up with a 2mm (0.08 inches) gap between the interior and exterior render.
I’ve talked with several experts. They all say:
Compressible sealing tape is better than foam, if it is installed 100% correctly. And nowadays, this 100% correct installation is rarely the case.
X
xMisterDx31 Jan 2023 20:24Bausparfuchs schrieb:
As usual, some uninformed half-truths here.
There is a standardized RAL installation method for windows, and foam insulation has no place in it. If my window installer showed up with foam, he would be sent back immediately. Show me where it says that. RAL standards only specify that you should not use foam insulation exclusively. If an interior window sealing tape and an exterior rain-resistant plastering strip are used, foam insulation in between is acceptable according to RAL as well.
Half-knowledge, indeed...
PS:
By the way, my experience from 12 years as an electrical engineer in specialized plant construction says that the "better" but more complicated solution is often worse because it is much more complex, prone to errors, more expensive... and above all requires a level of care during installation that is rarely achieved even in precision mechanical engineering...
I am starting to believe that something is wrong with my RAL "Guideline for the planning and... installation of windows..." 2020 edition. It does not mention anything about wind braces or that expanding foam is prohibited. Among many other approved methods, there is also a chapter about multifunction sealing tapes ("3D compressible tapes") that are waterproof from the outside and airtight on the inside.
C
Charlie901 Feb 2023 22:39And don't forget, there are significant quality differences in compressible sealing tapes as well!
If possible, it should be "impregnated compressible sealing tape."
If possible, it should be "impregnated compressible sealing tape."
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