ᐅ Insulation of upper floor ceiling. Was it inspected by an energy consultant?
Created on: 18 Jul 2021 12:35
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Delm86861219
Hello, our energy consultant is prescribing insulation for the upper floor ceiling. See attachment.
PUR/PIR with thermal conductivity value 0.023 W/(m·K), 12cm (5 inches)
Then again PUR/PIR with thermal conductivity value 0.023 W/(m·K), 12cm (5 inches), plus OSB boards.
I think this is a lot.
We are building according to KfW 55 standard.
Ytong 36.5cm (14 inches) with 0.08 W/(m·K)
Air-to-water heat pump
Ground slab insulated with 14cm (5.5 inches).
My question: does the energy consultant actually come to the site to check the insulation?
So far, he has not even been on site. We have already finished the shell structure.
PUR/PIR with thermal conductivity value 0.023 W/(m·K), 12cm (5 inches)
Then again PUR/PIR with thermal conductivity value 0.023 W/(m·K), 12cm (5 inches), plus OSB boards.
I think this is a lot.
We are building according to KfW 55 standard.
Ytong 36.5cm (14 inches) with 0.08 W/(m·K)
Air-to-water heat pump
Ground slab insulated with 14cm (5.5 inches).
My question: does the energy consultant actually come to the site to check the insulation?
So far, he has not even been on site. We have already finished the shell structure.
Grobmutant schrieb:
What does the blower door test have to do with this?Exactly. (And other necessary words…
Actually, meeting the KfW55 standard is sufficient. How you achieve that doesn’t matter. Your architect or energy consultant uses calculation tools that generate a value based on many parameters. If you adjust one factor (for example, changing the insulation between floors), you have to compensate elsewhere to keep the overall value (such as the total primary energy demand) within limits.
A small example: In our initial calculation, we included this very expensive WLG 022/023 insulation for the first 6 or 8cm (2.4 or 3.1 inches) of floor insulation. After completing the blower door test (which went extremely well), we asked our energy consultant to recalculate using these results. As a result, we were able to use significantly more cost-effective insulation here.
I can hardly believe that so much of this ultra-expensive WLG 023 PIR insulation is actually necessary. Maybe your energy consultant can suggest alternatives. The calculation tools allow quickly testing different options in just a few minutes, so it’s really no big effort.
A small example: In our initial calculation, we included this very expensive WLG 022/023 insulation for the first 6 or 8cm (2.4 or 3.1 inches) of floor insulation. After completing the blower door test (which went extremely well), we asked our energy consultant to recalculate using these results. As a result, we were able to use significantly more cost-effective insulation here.
I can hardly believe that so much of this ultra-expensive WLG 023 PIR insulation is actually necessary. Maybe your energy consultant can suggest alternatives. The calculation tools allow quickly testing different options in just a few minutes, so it’s really no big effort.
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Delm8686121918 Jul 2021 23:27Thank you very much for the many responses. I will call my energy consultant tomorrow. But if he is not willing to cooperate: does he even come by to check the insulation?
Delm86861219 schrieb:
Thank you very much for the many replies. I will call my energy consultant tomorrow.
But if he is uncooperative: does he even come by to check the insulation? You have already received the answer to that: no.
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nordanney19 Jul 2021 08:18Delm86861219 schrieb:
Does he even come by to check the insulation?You need someone to fully supervise the energy aspects of your construction project. The energy consultant is therefore responsible for inspecting everything. Whether he visits in person, requires invoices, or if photos are sufficient will be specified in your contract or he can tell you directly if you ask him.nordanney schrieb:
You need someone to fully oversee the energy aspect of the construction project. The energy consultant is responsible for checking everything. Whether they visit the site, want to see invoices, or if photos are sufficient depends on your contract or they can tell you directly if you ask them.Supervising and checking also means documenting. The implementation proposals from the tool do not serve as proof of proper execution. Invoices (e.g., insulation material xyz) alone do not prove that the materials were installed correctly. I personally documented the correct installation for my energy consultant by taking photos as instructed. On several occasions, I was told to document more clearly or to have corrections made in cases of improper installation.Similar topics