ᐅ Building with Aerated Concrete / Autoclaved Aerated Concrete (AAC) / Cellular Concrete

Hello,..

I just found this forum through Google, and so far I like it a lot. So first of all, hello to everyone!!

Now to my question

I recently bought a garden plot. I have demolished the "shed" that was there. Now I am slowly moving towards building something new. For the base, I plan to pour a strip foundation 80 cm (31.5 inches) deep. On top of that, I want to pour a 15 cm (6 inches) slab.

The building will be 4.50 m (15 feet) wide and 8 m (26 feet) long. The height will be 3.80 m (12.5 feet). The living area on the ground floor will have a ceiling height of 2.20 m (7.2 feet), and the upper floor will be used as sleeping and storage space. It will have a flat roof.

I would like to build the whole thing with 17 cm (6.7 inches) Ytong blocks.

What do you think about this?

How does building with Ytong work? I have read that it is not really possible or allowed to insulate it well. I was thinking of applying plastic render on the outside. Would that be enough?

I would be very grateful if some of you could give me a few helpful tips!

Thank you very much..

Regards, Markus

Federal Allotment Garden Act

In an allotment garden, a simple garden shed is permitted with a maximum floor area of 24 square meters (258 square feet), including any covered terrace; the provisions of Sections 29 to 36 of the Building Code remain unaffected. It must, by design and especially by its equipment and furnishings, not be suitable for permanent residence.

Just for your information!!!

Regards, thommi

Yes, in my case, it is privately owned land with a special permit because the old house was that large. This is contractually regulated. So, it can be considered as maintenance of the old house!

However, that would be a different topic... I am more interested in information about the above-mentioned subject..

Yes, I want to build it myself. I have already built a similar house with a friend, but it was made of wood. It also has that typical low ceiling height in the loft. I don’t plan to use it much more than that, and it’s not intended for permanent living. It’s just for summer weekends or holidays.

My plan is either to use wood again or Ytong (aerated concrete blocks). If I go with wood, I would use 12cm (5 inch) beams or build a beam frame, and around that use construction poles. These are 4 meters (13 feet) long, 25cm (10 inches) high, and 5cm (2 inch) thick. Then I would add polystyrene insulation and plaster on the outside, and maybe mineral wool insulation on the inside.

Regarding my "second floor," I’m still not entirely sure. I’m a bit concerned that Ytong blocks might become unstable at that height. A friend’s acquaintance who is about to qualify as an architect can advise me at the end of September, but until then, I wanted to get some advice here.

Thanks in advance for your answers.

Best regards,
Markus

Hello Moppi!!

Well, that’s a tricky issue, but first of all, I would agree with Thommi regarding building regulations and related reasons!!

The next question is, why are you considering Ytong???
Have you already calculated what it would cost you to build with Ytong blocks?? And lastly, 17.5cm (7 inches) seems quite unstable to me… without various reinforcements, you won’t get very far..

Best regards.

I’m not looking for any architectural work here, I just wanted the question about insulation to be answered and to know if a 4m (13 feet) height with 17.5cm (7 inch) Ytong blocks is still stable.

@Schakal

I checked around that area a bit, and most people used Ytong. Most used 17.5cm (7 inch) blocks, but from my point of view, it didn’t seem very stable. Otherwise, I just did a bit of research online. That’s why I’m asking about the insulation. Also—a somewhat unusual thought—a relatively easy-to-handle material, not much work because of the insulation...

Well, let’s see. First pour the concrete, then we’ll take it from there...

Best regards