ᐅ Porous concrete bungalow – experiences? DIY beginner questions!
Created on: 24 Apr 2018 10:38
G
GooSe_77
Hello everyone,
We have been considering building or buying a house for some time now, and we would like to move forward and start planning more concretely. However, I feel overwhelmed by all the information available online—or sometimes not available—and I would like to discuss my idea here with you.
I want to do as much as possible myself, I’m not necessarily unskilled, and currently, I have enough time.
The desired living space would be a bungalow with 2-3 bedrooms, one bathroom, and a large living area. Ceiling height about 3.5m (11.5 ft) with a slightly sloped green roof at 10°. If I find a simple software, I can try drawing it.
I can well imagine using aerated concrete blocks (porous concrete) for the walls, mainly because I think I could manage that myself. The roof structure would be made of glued laminated timber (glulam), spanning about 7m (23 ft) without support, so sturdy beams will be needed. The advantage is that no load-bearing walls will have to be built. The living area would be completely open without any internal walls. A structural engineer would have to calculate this, but can anyone here make a rough estimation?
I have a few questions about the aerated concrete: as far as I know, it is vapor-permeable. So, if it is clad with wood on the outside and plastered with clay on the inside, would that create a comfortable indoor climate?
Is it possible to achieve a KfW 55 energy standard with corresponding windows? What thickness would be required in that case?
Electric and plumbing installations will be embedded in the walls. Is there anything to consider here since the blocks are thinner—regarding structural stability and thermal insulation?
What would be a rough estimate of the material costs for heating (underfloor heating), water, and electricity installation? Just to get a rough idea…
Thanks a lot,
Bastian
We have been considering building or buying a house for some time now, and we would like to move forward and start planning more concretely. However, I feel overwhelmed by all the information available online—or sometimes not available—and I would like to discuss my idea here with you.
I want to do as much as possible myself, I’m not necessarily unskilled, and currently, I have enough time.
The desired living space would be a bungalow with 2-3 bedrooms, one bathroom, and a large living area. Ceiling height about 3.5m (11.5 ft) with a slightly sloped green roof at 10°. If I find a simple software, I can try drawing it.
I can well imagine using aerated concrete blocks (porous concrete) for the walls, mainly because I think I could manage that myself. The roof structure would be made of glued laminated timber (glulam), spanning about 7m (23 ft) without support, so sturdy beams will be needed. The advantage is that no load-bearing walls will have to be built. The living area would be completely open without any internal walls. A structural engineer would have to calculate this, but can anyone here make a rough estimation?
I have a few questions about the aerated concrete: as far as I know, it is vapor-permeable. So, if it is clad with wood on the outside and plastered with clay on the inside, would that create a comfortable indoor climate?
Is it possible to achieve a KfW 55 energy standard with corresponding windows? What thickness would be required in that case?
Electric and plumbing installations will be embedded in the walls. Is there anything to consider here since the blocks are thinner—regarding structural stability and thermal insulation?
What would be a rough estimate of the material costs for heating (underfloor heating), water, and electricity installation? Just to get a rough idea…
Thanks a lot,
Bastian
C
Caspar202025 Apr 2018 06:3811ant schrieb:
Where did I miss this information?It needs to go in this direction with a 7m (23 ft) span and 120sqm (1,292 sq ft). But that was just a simple rule of three calculation on my part.
GooSe_77 schrieb:
90cm (35 inches)? I’ve seen several halls with spans of 7–9 meters (23–30 ft) using 16/32 beams spaced 3m (10 ft) apart... sure, they lack insulation and green roofing, but with reduced spacing?Were you aiming to build a roof that meets KFW 55 energy standards or a hall? Also, the flatter the roof, the thicker the beams need to be.
There are many structural options—insulation on top, between joists, etc.
And with my setup, 90/18 (cm) (35/7 inches) of the beam remains visible (because a lot happens between the rafters), so it’s worth it.
Caspar2020 schrieb:
Did you want to build a roof to KfW 55 standard or a warehouse? Also, the flatter the roof, the thicker the beams need to be. I was simply referring to warehouses, which also have flat roofs and need to withstand wind and snow loads. So far, I have assumed that the insulation in the roof won’t be very heavy...
Caspar2020 schrieb:
And there are many construction options—insulation above or between the rafters, etc.
And enough of the 90/18 (mm) (3.5/0.7 inches) beam heads remain visible for me (because a lot happens between the rafters), so it’s worth it. That sounds quite good, for example, and is definitely worth considering.
C
Caspar202027 Apr 2018 16:06A floor plan with dimensions would be helpful.
GooSe_77 schrieb:
That’s a rough idea, Yes, definitely not gently melting. It looks like a conversion of five row garages.
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