ᐅ Exterior Wall for KfW 40 (+) Standard: With or Without External Thermal Insulation Composite System (ETICS)?
Created on: 18 Feb 2021 11:23
F
Franke86
Hi everyone,
I need some advice. I’m currently planning my detached single-family house. The developer’s standard offering includes 24 hollow bricks plus 14 cm (5.5 inches) external wall insulation (EWI).
Since I want to build to KfW 40 (Plus) standard, they told me I would need 24 hollow bricks plus 18 cm (7 inches) EWI, which would cost an additional €1800.
What would you recommend? Is using EWI still considered "up-to-date," or is it becoming less common?
One advantage mentioned to me is that this creates a cavity wall construction, which offers better insulation and should also help prevent mold.
I also wanted to get some pricing for purely monolithic walls, and I received the following offer (standard is 24 hollow bricks + 14 cm (5.5 inches) EWI):
Which option would you choose, and are these additional costs typical or too high?
Brief details about the house: It’s a detached single-family home with a flat roof, approximately 160 sqm (1722 sq ft) living area, a ventilation system with heat recovery, and district heating for the heating.
Best regards,
Franke86
I need some advice. I’m currently planning my detached single-family house. The developer’s standard offering includes 24 hollow bricks plus 14 cm (5.5 inches) external wall insulation (EWI).
Since I want to build to KfW 40 (Plus) standard, they told me I would need 24 hollow bricks plus 18 cm (7 inches) EWI, which would cost an additional €1800.
What would you recommend? Is using EWI still considered "up-to-date," or is it becoming less common?
One advantage mentioned to me is that this creates a cavity wall construction, which offers better insulation and should also help prevent mold.
I also wanted to get some pricing for purely monolithic walls, and I received the following offer (standard is 24 hollow bricks + 14 cm (5.5 inches) EWI):
- T9 brick, thickness = 36.5 cm (14.4 inches) + €900
- 0.09 aerated concrete block, thickness = 36.5 cm (14.4 inches) + €900
- Hollow brick + 18 cm (7 inches) EWI = KfW 40+ compliant => + €1800
- T9 brick, thickness = 42.5 cm (16.7 inches) = ? KfW 40+ compliant => + €7000
- 0.09 aerated concrete block, thickness = 42.5 cm (16.7 inches) = ? KfW 40+ compliant => + €7000
Which option would you choose, and are these additional costs typical or too high?
Brief details about the house: It’s a detached single-family home with a flat roof, approximately 160 sqm (1722 sq ft) living area, a ventilation system with heat recovery, and district heating for the heating.
Best regards,
Franke86
Technological development over the past 50 years has been rapid, and it is accelerating even faster.
On the contrary, since the beginning of space exploration, efforts have been made to increase the efficiency of photovoltaic systems, but they ultimately failed.
The electric car hype occurred decades ago with the exact same problem, only today’s batteries are better.
Our heating systems have never had such short lifespans; poor technology like air-source heat pumps, which only pay off for political reasons because the primary energy factor was shifted without any physical basis, should be excluded.
Energy-plus houses / KfW40+ standards are purely political; they do not provide any financial benefit for the end user, only the industry profits.
75% of thermal protection calculations are still not performed according to DIN 18599, so progress in this area remains very slow.
On the contrary, since the beginning of space exploration, efforts have been made to increase the efficiency of photovoltaic systems, but they ultimately failed.
The electric car hype occurred decades ago with the exact same problem, only today’s batteries are better.
Our heating systems have never had such short lifespans; poor technology like air-source heat pumps, which only pay off for political reasons because the primary energy factor was shifted without any physical basis, should be excluded.
Energy-plus houses / KfW40+ standards are purely political; they do not provide any financial benefit for the end user, only the industry profits.
75% of thermal protection calculations are still not performed according to DIN 18599, so progress in this area remains very slow.