Hello everyone!
We’re currently trying to figure out the best material for our exterior wall insulation. The exterior walls of our house are made of 240mm (9.5 inches) expanded clay, and the west side was upgraded in the 1970s with “nice” asbestos cladding panels, with 30-40mm (1-1.5 inches) glass wool insulation stuffed underneath. So the build-up is roughly interior plaster -> 240mm expanded clay -> exterior plaster -> 30-40mm battens + glass wool -> cladding. The north and south sides of the facade were not clad.
I also received a quote from a company that would use 120mm (4.7 inches) EPS 035 (expanded polystyrene) for the 130m2 (1,400 sq ft) area.
But now I’m wondering which material is best to build on. EPS is basically a plastic and similar to Styrofoam. I’ve also heard good things about wood fiber boards. I’d like to learn about the materials used on your houses and why.
I’d appreciate any helpful advice!
We’re currently trying to figure out the best material for our exterior wall insulation. The exterior walls of our house are made of 240mm (9.5 inches) expanded clay, and the west side was upgraded in the 1970s with “nice” asbestos cladding panels, with 30-40mm (1-1.5 inches) glass wool insulation stuffed underneath. So the build-up is roughly interior plaster -> 240mm expanded clay -> exterior plaster -> 30-40mm battens + glass wool -> cladding. The north and south sides of the facade were not clad.
I also received a quote from a company that would use 120mm (4.7 inches) EPS 035 (expanded polystyrene) for the 130m2 (1,400 sq ft) area.
But now I’m wondering which material is best to build on. EPS is basically a plastic and similar to Styrofoam. I’ve also heard good things about wood fiber boards. I’d like to learn about the materials used on your houses and why.
I’d appreciate any helpful advice!
Hi,
another option could be Poroton WDF bricks for retrofitting insulation. The insulating effect is certainly not as good as EPS with the same thickness and it is also more expensive. However, many people do not want external thermal insulation composite systems (ETICS) / external wall insulation. In that case, it is still better than having no insulation at all.
Regards,
gnika77
another option could be Poroton WDF bricks for retrofitting insulation. The insulating effect is certainly not as good as EPS with the same thickness and it is also more expensive. However, many people do not want external thermal insulation composite systems (ETICS) / external wall insulation. In that case, it is still better than having no insulation at all.
Regards,
gnika77
D
dr.evil962 Apr 2020 14:42First of all, thank you for the responses so far!
I recently met with the certified chimney sweep at the house to have an energy performance certificate issued (commissioned by the seller). I then had a longer conversation with him about possible measures (roof, windows, facade, radiators, heating system). He said that an external thermal insulation composite system (ETICS) wouldn’t make much sense. The 240mm (9.5 inches) lightweight expanded clay aggregate blocks already have relatively good insulation values, and the payback period for a professionally executed insulation would be so long that I probably wouldn’t live to see it; the investment would likely be higher than the savings expected in the long run. It’s really frustrating.
I recently met with the certified chimney sweep at the house to have an energy performance certificate issued (commissioned by the seller). I then had a longer conversation with him about possible measures (roof, windows, facade, radiators, heating system). He said that an external thermal insulation composite system (ETICS) wouldn’t make much sense. The 240mm (9.5 inches) lightweight expanded clay aggregate blocks already have relatively good insulation values, and the payback period for a professionally executed insulation would be so long that I probably wouldn’t live to see it; the investment would likely be higher than the savings expected in the long run. It’s really frustrating.
dr.evil96 schrieb:
Thanks first of all for the previous answers!
He said that an external thermal insulation composite system (ETICS) wouldn’t make much sense. 240mm (9.5 inches) expanded clay aggregate already provides relatively good insulation values, and I probably wouldn’t live to see the payback of a properly installed insulation, meaning the investment might be greater than the long-term savings. It’s really frustrating. How old are you?
What is the current heating demand of the building or the annual energy consumption?
How large is the area of the concrete exterior walls?
If you know these figures, it’s easier to estimate how long the payback period would be.
Statements from chimney sweeps or similar should always be taken with caution. It should also be kept in mind that ETICS or whatever insulation you choose should ideally be installed when the facade is being renovated anyway. This means costs like scaffolding are already incurred and don’t need to be paid off separately. Only the additional cost for the insulation needs to be recouped. Considering that prices for fossil fuels are expected to rise (carbon taxes, market shifts away from historic lows, etc.) and that renewable energy is not cheap either, there is often more leeway than you might think. Furthermore, loans are currently almost interest-free, so the return on investment for insulation only needs to be higher than the loan interest rates.
Best regards,
Nika
dr.evil96 schrieb:
The exterior walls of our house are made of 240mm (9.5 inches) expanded clay aggregate blocks, and the west side was upgraded in the 1970s with "attractive" asbestos facade panels, with an additional 30-40mm (1.2–1.6 inches) of glass wool insulation stuffed underneath. Not every slate substitute product from that time contains asbestos. Insulating only one weather-exposed side (in this case just the west, which I assume is due to wind rather than heat, since they probably wouldn’t have chosen this option for thermal reasons) wouldn’t occur to me.
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