ᐅ Which Material Is Best for Blown-In Insulation? – Experiences?

Hello, I requested a quote for blown-in insulation, and they asked me which material I prefer: polystyrene beads, glass wool, or rock wool.

Does anyone have experience with this? Are the benefits of rock wool worth the additional cost of about 30%? My cavity is approximately 9cm (3.5 inches).

Thanks

Stone wool has a higher density, which results in slightly better sound insulation and heat protection. It is also somewhat more heat resistant. However, this can be a disadvantage when used as blown-in insulation. On average, its thermal insulation performance is slightly lower.

Given the use of blown-in insulation and such a significant price difference, I would probably opt for glass wool instead.

Thanks, I was leaning in that direction as well.

Benutzer 1002 schrieb:

Hello, I requested a quote for blown-in insulation, and I was asked which material I prefer. [...] My cavity is about 9cm (3.5 inches) deep.

We are not familiar with your house. A 9cm (3.5 inches) air gap is very unusual and should be explained in more detail. Most providers of blown-in insulation act primarily as sellers of their (non-licensed) combination of products and services, often lacking expertise and not offering alternative solutions. Therefore, their main argument is usually based on the price-to-benefit ratio. Besides being surprised at how many cubic meters of whatever material will be needed to fill your cavity, you should discuss the measure with a neutral and competent expert. In my imagination, an Albanian roofing window replacement mafioso is currently injecting homeopathic pellets into your cavity.

---

https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/

Hello, this is already a larger local company, so I have fewer concerns in that regard. I was present during the drilling and can understand how it was determined. How can I further explain the large cavity?

Benutzer 1002 schrieb:

Hello, this is already a larger local company, so I have fewer concerns in that regard. I was present during the borehole tests and can understand how the data was collected.

I advise those seeking my guidance never to rely solely on the “treatment proposal” from a provider, but to have a methodically neutral expert assess which approach is most suitable for the specific modernization or renovation project.

Benutzer 1002 schrieb:

How can I further explain the large cavity?

For this, I would always recommend consulting the building documentation, comparing the plans with the actual construction carried out at the time, and discussing and planning the entire package of measures with an architect experienced in working with existing buildings. Contracts based on estimates and billing according to measured quantities are the biggest cost traps in projects like these.

---

https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/