ᐅ Single-family house with two housing units eligible for KFW funding

@familie_s I’m interested in how or with what materials you insulate your roof?

So, can we ultimately say that a monolithic construction (let’s say I simply stick to KfW55 to calm down the KfW40 discussion a bit) is more expensive than using 175mm (7 inches) Poroton blocks and then attaching styrofoam insulation on the outside?

Buddy90 schrieb:

So, can we ultimately say that a monolithic construction (let’s just stick with KFW55 to tone down the KFW40 debate) is more expensive than using 175mm (7 inches) Poroton blocks and then attaching polystyrene insulation afterwards?

It depends on the time frame you are calculating for. Our neighbors are currently renovating the facade insulated in the 1990s. They are completely removing everything and starting over. Just the disposal costs alone bring tears to your eyes. Both are in their late 60s and are going through this mainly to make the house suitable for their children—or to prepare for a sale.

Buddy90 schrieb:

So, can we finally say that a monolithic construction (let’s just stick with KFW55 for now to ease the KFW40 debate a bit) is more expensive than using 175mm (7 inches) Poroton blocks with polystyrene insulation applied afterwards?

That’s not a very well-phrased question. From my point of view, it’s like starting to choose a car based on the number of cylinders.

What I mean is:
Unless you are doing the masonry yourself, completely different questions come first.

Among others:
Building permit / planning permission
Surroundings (noise insulation can also be a topic)
The best company for your individual needs (it’s better not to dictate the materials to a company! They should use what they always work with and have experience in. The two questions before are only preliminary because they might influence the choice of the company. For example, if facing brick is specified and a company has zero experience with it, another company might be more suitable).

So, here you still haven’t addressed the question of which company is the right one.
And that depends again on the plot of land and the planned house.

Therefore, the question about the masonry material is actually not relevant at this point.

Buddy90 schrieb:

So, can we finally say that a monolithic construction (let’s just stick to KfW55 to avoid the KfW40 debate) is more expensive than using 175mm (7 inches) Poroton bricks and then applying polystyrene insulation on the outside?

If you want to build a single-family house at EH55 standard (which no longer qualifies for KfW funding), monolithic construction is not only better but also cheaper. Exterior thermal insulation composite systems (ETICS) with plaster facades require exemplary, very even masonry, which almost excludes DIY beginners. Building an EH40 capable single-family house means focusing heavily on the U-value, and no matter what structural wall system you use, you’ll end up significantly thicker than with just insulation materials.

Schorsch_baut schrieb:

Our neighbors are currently renovating the facade that was insulated in the 1990s. They’re stripping everything off and doing it all over again. Just the disposal costs bring tears to your eyes. Both are in their late 60s and are doing this mainly to make the house suitable for their children—or to prepare for a sale.

Nonsense. Children in their mid-forties rarely dream of moving back to their childhood hometown (and having to buy out their siblings), just because their parents managed to get homeownership there. A buyer in the worst case scenario in over twenty years (assuming the last surviving parent moves out then) will not get a discount on the mandatory renovation requirements that apply at that time, just because some small steps toward the future standard (i.e. GEG2025) have already been taken today. They’d be better off enjoying cruises. Maybe by 2045 there will be a competent, sensible government again, and insulation materials will be as complicated to dispose of as asbestos is today (or even more so: something to be disposed of interstellarly).

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Papierturm schrieb:

This is not a well-framed question. From my point of view, it’s like starting to choose a car based on the number of cylinders.

What I mean is:
Unless you are building the masonry yourself, completely different questions take priority.

Among them:
Zoning plan / building regulations
Surroundings (noise protection can also be an issue)
A company that fits your needs best (it’s usually not a good idea to dictate exactly what product to use to a company! They should install what they are experienced with and have done many times. The two previous questions are just preliminary because they can influence the choice of company. For example, if facing brick is specified but a company has no experience with it, another company might be better suited).

So, even here the question of which company is actually the right one hasn’t been addressed yet.
That, in turn, depends on the plot and the planned house.

Therefore, the “masonry material” question itself is not really relevant at this stage.

Unfortunately, this whole long text does not actually answer my rather simply asked question... Sorry...

11ant schrieb:

If you want to build an EH55 (for which there is no longer any KfW funding), building monolithic is not only better but also cheaper...

THANK YOU! :-)