ᐅ Semi-detached bungalow 8 m² KfW70 without ventilation / basement, Y-Tong
Created on: 21 Dec 2013 01:16
D
Der suchende
We want to buy and build a newly constructed, fully planned half of a bungalow without a basement and with a hipped roof.
Please excuse any incorrectly spelled or misnamed technical terms – we are laypersons.
After reading a lot, we are now in the “phase of uncertainty,” which is probably familiar to many here ;-)
Here are some details about the project:
Hipped Roof Bungalow Half
- Building foundation made of glass foam gravel with reinforcement, compacted, concrete, base slab covered to be moisture-tight (this is probably the slab-on-grade)?
- 6cm (2.4 inches) insulation layer, 6cm (2.4 inches) floating screed
- Exterior shell 36.5cm (14.4 inches) aerated concrete in system blocks or Y-Tong plan blocks W-PPW 2-040, MSH steel profile 120/80/5 as support in the bathroom (ceiling) window area – for what purpose?
- Double layer reinforcement with mesh and scratch coat on the exterior
- Windows with Uw = 1.0, triple glazing
- All rooms have windows (open plan kitchen/living area, utility room, bedroom, bathroom)
- Room height about 2.5m (8.2 ft), house height up to the ridge 6.11m (20 ft)
- District heating (underfloor heating in all rooms)
- Attic accessible via hatch, insulation between rafters in the roof
- Usable floor area 114m² (1,227 sq ft) (footprint 88m² (947 sq ft))
That’s the rough information so far. More details gladly available.
Through this forum, I learned about passive and active ventilation (and also KfW 70 due to funding incentives ;-)).
Our question regarding active/passive ventilation: Is it necessary under these circumstances? We both work full-time and often don’t have the chance to ventilate additionally around midday. We would prefer to invest the money saved from not installing or discussing a ventilation system into our list of special features.
A thermal protection certificate with data for our house type and even the house number, according to the Energy Saving Ordinance 2009 (KfW 70 standard), and an energy performance certificate are included in the building description. The values are difficult for me to understand. The energy certificate specifies "natural ventilation," valid until 2021.
Could someone please help or share their opinion?
Thank you in advance
Heiko and Martina
Please excuse any incorrectly spelled or misnamed technical terms – we are laypersons.
After reading a lot, we are now in the “phase of uncertainty,” which is probably familiar to many here ;-)
Here are some details about the project:
Hipped Roof Bungalow Half
- Building foundation made of glass foam gravel with reinforcement, compacted, concrete, base slab covered to be moisture-tight (this is probably the slab-on-grade)?
- 6cm (2.4 inches) insulation layer, 6cm (2.4 inches) floating screed
- Exterior shell 36.5cm (14.4 inches) aerated concrete in system blocks or Y-Tong plan blocks W-PPW 2-040, MSH steel profile 120/80/5 as support in the bathroom (ceiling) window area – for what purpose?
- Double layer reinforcement with mesh and scratch coat on the exterior
- Windows with Uw = 1.0, triple glazing
- All rooms have windows (open plan kitchen/living area, utility room, bedroom, bathroom)
- Room height about 2.5m (8.2 ft), house height up to the ridge 6.11m (20 ft)
- District heating (underfloor heating in all rooms)
- Attic accessible via hatch, insulation between rafters in the roof
- Usable floor area 114m² (1,227 sq ft) (footprint 88m² (947 sq ft))
That’s the rough information so far. More details gladly available.
Through this forum, I learned about passive and active ventilation (and also KfW 70 due to funding incentives ;-)).
Our question regarding active/passive ventilation: Is it necessary under these circumstances? We both work full-time and often don’t have the chance to ventilate additionally around midday. We would prefer to invest the money saved from not installing or discussing a ventilation system into our list of special features.
A thermal protection certificate with data for our house type and even the house number, according to the Energy Saving Ordinance 2009 (KfW 70 standard), and an energy performance certificate are included in the building description. The values are difficult for me to understand. The energy certificate specifies "natural ventilation," valid until 2021.
Could someone please help or share their opinion?
Thank you in advance
Heiko and Martina
Yes, the ventilation system requires a condensate drain and must be installed within the heated building envelope... otherwise, you will have issues with condensation inside the ducts, which I think you would prefer to avoid...
Of course, you could fully insulate the attic... but installing it in the utility room is definitely the more cost-effective option...
Of course, you could fully insulate the attic... but installing it in the utility room is definitely the more cost-effective option...
B
Bauexperte27 Dec 2013 11:38Hello Martina & Heiko,
And what is the total cost of the construction including the plot?
If you are away from home all day, that is not a good idea.
Unlike the user "Mycraft," I am not an unconditional advocate of centralized systems, since both systems have advantages and disadvantages, and a decentralized system is definitely better than no ventilation at all; as always, it depends on the circumstances. The decentralized system is also more affordable, leaving some budget for a few extra customization options 😉
Regards, Bauexperte
Der suchende schrieb:
So here is some information about the project:
Half of a hip roof bungalow
[...]
-Room height is approximately 2.5m (8.2 ft), the house measures 6.11m (20 ft) up to the ridge.
-District heating (underfloor heating in all rooms)
-Attic accessible by hatch, insulation between rafters in the roof
-Usable floor area 114m² (1,227 sq ft) (footprint 88m² (947 sq ft))
That’s the basic info for now. More, of course, upon request.
And what is the total cost of the construction including the plot?
Der suchende schrieb:
Since the ventilation system was neither offered nor discussed, we would prefer to invest that money in the list of special requests instead.
If you are away from home all day, that is not a good idea.
Unlike the user "Mycraft," I am not an unconditional advocate of centralized systems, since both systems have advantages and disadvantages, and a decentralized system is definitely better than no ventilation at all; as always, it depends on the circumstances. The decentralized system is also more affordable, leaving some budget for a few extra customization options 😉
Regards, Bauexperte
D
Der suchende27 Dec 2013 13:56Hello Mycraft,
Thank you for the tip about the utility room. The utility room is only 1.40m x 3.50m (4.6 ft x 11.5 ft). There’s no space for anything else except the washing machine and dryer, since the underfloor heating components still need to be installed there.
The attic is fully insulated (insulation between rafters), and that’s the only place where we could install the central system. The system would surely be better suited there but also more expensive to install.
Hello Bauexperte,
Yes, a decentralized system is definitely better than none. The bungalow is easy to ventilate since everything is on one level. It should also be easy to implement.
The bungalows vary between 210,000 and 270,000 euros plus special requests, depending on the plot size and type. They are located right by Olga Park in OB, basically the Olga residential park. So the project is easy to find.
What makes me skeptical is that after two years there is still so much left to sell, but it has to be a bungalow. About half are roughly built or in the finishing stages.
I will look into contacting ventilation specialists and request quotes for both options.
Good luck
Heiko
Thank you for the tip about the utility room. The utility room is only 1.40m x 3.50m (4.6 ft x 11.5 ft). There’s no space for anything else except the washing machine and dryer, since the underfloor heating components still need to be installed there.
The attic is fully insulated (insulation between rafters), and that’s the only place where we could install the central system. The system would surely be better suited there but also more expensive to install.
Hello Bauexperte,
Yes, a decentralized system is definitely better than none. The bungalow is easy to ventilate since everything is on one level. It should also be easy to implement.
The bungalows vary between 210,000 and 270,000 euros plus special requests, depending on the plot size and type. They are located right by Olga Park in OB, basically the Olga residential park. So the project is easy to find.
What makes me skeptical is that after two years there is still so much left to sell, but it has to be a bungalow. About half are roughly built or in the finishing stages.
I will look into contacting ventilation specialists and request quotes for both options.
Good luck
Heiko
B
Bauexperte28 Dec 2013 00:16Hello Heiko,
Since the provider mainly comes from commercial construction, there will probably be a lot of concrete used; I couldn’t find a building description. I assume you have read the building specification and contracts carefully and therefore know what you are getting into.
Regards, Bauexperte
Der suchende schrieb:I looked into it because I didn’t want to believe the prices you mentioned. On the one hand, the plot prices in OH aren’t really that cheap after all, and on the other hand, a bungalow of the size you want here in the Rhineland costs about 170,000 EUR as a KfW 70 efficiency house.
Depending on the size and type of the plot, the bungalows cost between 210,000 and 270,000 EUR plus additional options. Located directly at Olga-Park in OB, essentially the Olga residential park. So the project is easy to find.
Since the provider mainly comes from commercial construction, there will probably be a lot of concrete used; I couldn’t find a building description. I assume you have read the building specification and contracts carefully and therefore know what you are getting into.
Regards, Bauexperte
D
Der suchende28 Dec 2013 19:24Bauexperte schrieb:
Hello Heiko,
...on the other hand, a bungalow of the size you want costs about EUR 170,000 as a KfW 70 energy-efficient house here in the Rhineland.
Best regards, Bauexperte...that’s what I’d like, including the land ;-), located within easy driving distance toward Essen 😎.
Today the development plan I was waiting for finally arrived. Since I planned to sign next week, we can now back out of it. We won’t be buying a bungalow there!
Now my nickname actually fits, and my wife sadly says, "...we don’t have a home anymore."
On the positive side, our apartment is sold, and if needed, we can stay in it until September 30. Since the kitchen was included in the sale, we might not have to store as much furniture temporarily if we haven’t found anything new yet.
At least I was able to pick up some partial knowledge here...
Der suchende schrieb:
Today the zoning plan I had been waiting for finally arrived. Since I was only planning to sign next week, we can still back out now. We won’t be buying a bungalow there!
Could you explain that in more detail? How does the zoning plan affect your decision to buy?