ᐅ Exterior Insulation: Building a House with Poroton T7 Clay Blocks and Mineral Wool
Created on: 31 Mar 2014 11:30
S
Serage
Hello!
We are planning to build our house using Poroton T7 MW blocks. Our question concerns the wall thickness. The ground floor will have a brick veneer. Since the brick will also add a certain thickness, we want to build the ground floor walls thinner than the upper floor walls and accommodate the brick in that area. The question is:
Is it better to have 36cm (14 inches) on the ground floor and 42cm (17 inches) on the upper floor, or 42cm (17 inches) on the ground floor and 49cm (19 inches) on the upper floor? Are there any other options for insulation in this case?
Many thanks to the experts here!
We are planning to build our house using Poroton T7 MW blocks. Our question concerns the wall thickness. The ground floor will have a brick veneer. Since the brick will also add a certain thickness, we want to build the ground floor walls thinner than the upper floor walls and accommodate the brick in that area. The question is:
Is it better to have 36cm (14 inches) on the ground floor and 42cm (17 inches) on the upper floor, or 42cm (17 inches) on the ground floor and 49cm (19 inches) on the upper floor? Are there any other options for insulation in this case?
Many thanks to the experts here!
What are the reasons why things go wrong? It would be interesting to know in order to take appropriate measures or to understand where my thinking might be flawed.
In the nearby neighborhood, neighbors have built a passive house using exactly this combination.
Thank you very much! 🙂
P.S.: We will be building with a central ventilation system.
In the nearby neighborhood, neighbors have built a passive house using exactly this combination.
Thank you very much! 🙂
P.S.: We will be building with a central ventilation system.
Hello,
You can’t have everything at almost zero cost at the same time. That would be like the philosopher’s stone, which, as we know, has not yet been found! Completely logical! :-) Anyone deserving of a Nobel Prize for this, please step forward! :-)
Just ask the overly clever, anonymous advisors what financial liability they take for their "advice." ;-)
In my opinion, that’s where the wheat separates from the chaff—quite clearly and quickly! ;-)
Best regards.
Serage schrieb:Simply put, an optimized overall design for a gas condensing boiler is fundamentally incompatible with a heat pump in the long term! You need to know exactly what your overall goal is!
What are the reasons why it goes wrong? ...
You can’t have everything at almost zero cost at the same time. That would be like the philosopher’s stone, which, as we know, has not yet been found! Completely logical! :-) Anyone deserving of a Nobel Prize for this, please step forward! :-)
Just ask the overly clever, anonymous advisors what financial liability they take for their "advice." ;-)
In my opinion, that’s where the wheat separates from the chaff—quite clearly and quickly! ;-)
Best regards.
So, a retrofit is basically not even possible? We are installing underfloor heating, which requires low temperatures. Isn’t this similar with a heat pump? Where exactly do problems arise if you decide later to go for a heat pump (since it is more efficient, cheaper, and more durable) in combination with a photovoltaic system and storage? I personally lean towards the 42 or even 49 cm (17 or 19 inches) wall blocks. What is the situation with that? Or are 36 cm (14 inches) blocks enough? An initial calculation shows roughly a 5,000 increase in cost for each additional wall thickness step, so about 10,000 extra for the 49 cm wall.
Just as a general piece of information: insulated bricks are usually used in cases where additional insulation, such as cavity insulation (for brick veneer) or external insulation and finish system (EIFS) (for plastered facades), is not desired. Therefore, covering a T7 wall with bricks generally does not make much sense. Mixed facades (brick at the bottom, plaster/wood/other materials on top) are generally more complex and usually more expensive. You should rather think about what your priorities are, and then – to respond to Euro’s contribution – carry out a proper preliminary assessment such as a heating load calculation, budget planning, etc. If you want a passive house, then build it accordingly – or choose not to and go with what you prefer (gas/solar thermal system). In any case, I don’t think it is a good idea to keep all options open without making important decisions.
Good luck
K1300S
Good luck
K1300S
One more thing: Please don’t see this as a selection of individual components that you can mix and match as you please. It needs/should be an overall concept where all components are coordinated with each other – otherwise, the total benefit might end up being less than half of the sum of the individual benefits.
The plan is to build the insulation so that the Passive House standard can be achieved later. That’s basically fine, right? Good insulation can’t hurt (with a good airtightness layer), especially since it also improves heat storage capacity and soundproofing. The brickwork is just for aesthetics. I don’t expect any particular insulation values there. So the money basically goes 100% into the appearance.
As I understand you, you think it makes sense to build the Passive House right away. However, that would require us to decide immediately on a heat pump. I still consider heat pumps to be somewhat vulnerable, and without our own electricity supply, it doesn’t make much sense. That means the photovoltaic system with storage also adds significantly to the cost. I’m reluctant to take on an additional 30–45k (in local currency), which would then cost me almost twice as much due to compound interest. I’d rather wait until I have some extra funds to invest in a good system (which may also be much more mature and affordable by then). Especially since the prices for solar batteries, photovoltaic systems, and heat pumps are likely to continue falling.
As I understand you, you think it makes sense to build the Passive House right away. However, that would require us to decide immediately on a heat pump. I still consider heat pumps to be somewhat vulnerable, and without our own electricity supply, it doesn’t make much sense. That means the photovoltaic system with storage also adds significantly to the cost. I’m reluctant to take on an additional 30–45k (in local currency), which would then cost me almost twice as much due to compound interest. I’d rather wait until I have some extra funds to invest in a good system (which may also be much more mature and affordable by then). Especially since the prices for solar batteries, photovoltaic systems, and heat pumps are likely to continue falling.
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