Hi everyone,
I wanted to ask if anyone has experience with Isarholz windows. I am currently interested in the INO-HA80 MM model.
Basically, the key specifications are very good. The Ug value, concealed fittings, flush surfaces on both inside and outside. Even the sound insulation rating of 34 is good.
I have mainly seen comparable versions from much higher-priced suppliers like Josko and Internorm.
Since there are significant price differences here, I am a bit uncertain whether the quality might be compromised.
Thanks for the help.
I wanted to ask if anyone has experience with Isarholz windows. I am currently interested in the INO-HA80 MM model.
Basically, the key specifications are very good. The Ug value, concealed fittings, flush surfaces on both inside and outside. Even the sound insulation rating of 34 is good.
I have mainly seen comparable versions from much higher-priced suppliers like Josko and Internorm.
Since there are significant price differences here, I am a bit uncertain whether the quality might be compromised.
Thanks for the help.
This year, I purchased windows from Isarholz through the local specialist dealer for self-installation. So far, I haven't found any quality issues. The windows are well-made, and the seals and warm edge spacers look clean and well-installed.
We have INO HA 80 made of pine, painted white on the inside and brown on the outside.
The hardware is from Roto, which I think is hard to criticize.
Isarholz manufactures in Slovenia, which I believe provides a price advantage compared to manufacturers from Germany and Austria.
I would recommend Isarholz.
We have INO HA 80 made of pine, painted white on the inside and brown on the outside.
The hardware is from Roto, which I think is hard to criticize.
Isarholz manufactures in Slovenia, which I believe provides a price advantage compared to manufacturers from Germany and Austria.
I would recommend Isarholz.
A brief addition: the aluminum cladding from Isarholz is always made weather-resistant as a standard feature. However, I only found this out after asking several times.
Other manufacturers highlight this repeatedly as a quality aspect in their catalogs, which initially made me worry that the aluminum cladding might be of inferior quality.
In practice, the identical aluminum cladding is also sourced in the same quality from the same manufacturer by many German and Austrian window manufacturers.
I cannot comment on the quality of the processed wood. It would, of course, be interesting to know how much low-quality sapwood is used. However, this information cannot be obtained from any manufacturer.
Other manufacturers highlight this repeatedly as a quality aspect in their catalogs, which initially made me worry that the aluminum cladding might be of inferior quality.
In practice, the identical aluminum cladding is also sourced in the same quality from the same manufacturer by many German and Austrian window manufacturers.
I cannot comment on the quality of the processed wood. It would, of course, be interesting to know how much low-quality sapwood is used. However, this information cannot be obtained from any manufacturer.
F
Felix111721 Mar 2025 09:26Thank you, yes, that already helps a lot. Maybe I’m approaching this a bit too optimistically, but in my opinion, a window mainly consists of:
1. Glass -> If it has the certifications and meets the standards, I don’t see much of a problem there.
2. Wood -> This is probably the biggest factor, but I will definitely sample 1–2 completed projects.
3. Aluminum -> I see it similarly, but it’s good that you also got confirmation that they are highly weather-resistant.
4. Assembly -> This is probably where the biggest differences lie, although I wouldn’t automatically assume that a factory in Slovenia with 600 employees produces lower-quality than a local window manufacturer with 15.
Thanks again.
1. Glass -> If it has the certifications and meets the standards, I don’t see much of a problem there.
2. Wood -> This is probably the biggest factor, but I will definitely sample 1–2 completed projects.
3. Aluminum -> I see it similarly, but it’s good that you also got confirmation that they are highly weather-resistant.
4. Assembly -> This is probably where the biggest differences lie, although I wouldn’t automatically assume that a factory in Slovenia with 600 employees produces lower-quality than a local window manufacturer with 15.
Thanks again.
miji252 schrieb:
This year, I purchased windows from Isarholz through a local specialist dealer for self-installation. So far, I haven’t noticed any quality issues. [...] Isarholz manufactures in Slovenia, which I believe provides a price advantage compared to manufacturers from Germany and Austria. [ / ] The aluminum cladding from Isarholz is always produced to a high weather-resistant standard by default. However, I only found this out after asking multiple times. Other manufacturers emphasize this as a quality feature repeatedly in their catalogs, so at first, I feared that the aluminum cladding might be of lower quality. In practice, the identical aluminum cladding is also sourced by many German and Austrian window manufacturers from the same supplier with identical quality. I can’t comment on the quality of the wood used, but it would be interesting to know how much lower-quality sapwood is incorporated. However, this information is not available from any manufacturer. Self-installation in existing buildings is bold. We found no manufacturers willing to supply direct to end customers. The quality of the “German” system providers is always ensured through certification (ISO 9000 and others). Most suppliers have production facilities in Poland, Slovakia, and Belgium. Slovenian wages seem to be attractive. There is no such thing as moderately weather-resistant aluminum. Aluminum-clad wood windows from budget providers regularly use wood that is not lower grade in the sense of “second choice,” but rather softer wood species that would not be suitable without the aluminum weather cladding. This is far less about the cost of the wood itself and more related to the fact that harder woods wear down milling tools significantly faster.
https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
11ant schrieb:
Wood-aluminum windows from lower-cost suppliers often do not use low-grade wood in the sense of "second choice," but rather softer wood species that would not be suitable without an aluminum weather shield. Manufacturers of wood and wood-aluminum windows usually offer the same types of wood for both wood-only and wood-aluminum windows.
If the pine or spruce from the manufacturer is suitable for producing pure wood windows, it should certainly be sufficient for wood-aluminum windows.
Additionally, we did not purchase directly from the manufacturer but through a specialist dealer/window installation company. I believe the installation is much cleaner and more in line with RAL standards than many specialist companies, simply because timing was not an issue for me.
miji252 schrieb:
Also, we didn’t buy directly from the manufacturer but through a specialist retailer/window installation company. I think the installation is much neater and closer to the RAL standard than many professional firms, simply because time wasn’t an issue for me. Yes, your installation looks very tidy.
miji252 schrieb:
Manufacturers of timber and timber-aluminum windows generally offer the same types of wood for both timber and timber-aluminum windows. The other way around. Manufacturers who produce quality timber windows often also offer the aluminum option. Makers of cheap timber-aluminum windows hope that as few customers as possible will skip the recommended weatherproofing.
https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/