ᐅ Perimeter insulation 12 or 16 cm extruded polystyrene (XPS)
Created on: 29 Jul 2020 13:50
A
annab377
Hello,
For a single-family house with a concrete wall basement in Baden-Württemberg (average outside temperature around -14°C (7°F) according to the WP map), would you choose 12 cm or 16 cm XPS for perimeter insulation?
What I think about the basement is that it stays pleasantly cool in summer, cooler than the ground and upper floors. If I insulate more, maybe it won’t stay as cool? Or does the 4 cm difference not really matter there? The price difference between 12 and 16 cm is only about 1,500 EUR.
Or is it better to invest the extra 1,500 EUR and then save on heating costs in winter? But the money would have to pay off first through saved heating costs (feels like it would take over 100 years, probably)... hmm
For our KfW 55 house, both 12 and 16 cm XPS perimeter insulation would easily meet the requirements. The thermal transmittance value (U-value) is 0.215.
Regards
For a single-family house with a concrete wall basement in Baden-Württemberg (average outside temperature around -14°C (7°F) according to the WP map), would you choose 12 cm or 16 cm XPS for perimeter insulation?
What I think about the basement is that it stays pleasantly cool in summer, cooler than the ground and upper floors. If I insulate more, maybe it won’t stay as cool? Or does the 4 cm difference not really matter there? The price difference between 12 and 16 cm is only about 1,500 EUR.
Or is it better to invest the extra 1,500 EUR and then save on heating costs in winter? But the money would have to pay off first through saved heating costs (feels like it would take over 100 years, probably)... hmm
For our KfW 55 house, both 12 and 16 cm XPS perimeter insulation would easily meet the requirements. The thermal transmittance value (U-value) is 0.215.
Regards
T
T_im_Norden3 Aug 2020 10:28Yes, it is, as this allows the calculation of heat loss.
However, this is usually taken into account during the room-by-room heating load calculation or the overall calculation.
And here we are back to the question of how much difference 4 cm (1.6 inches) actually makes.
However, this is usually taken into account during the room-by-room heating load calculation or the overall calculation.
And here we are back to the question of how much difference 4 cm (1.6 inches) actually makes.
