Hello everyone,
Today we received the building specification for our cost estimate.
The house we are building will not be a KFW house, only built to the Energy Saving Regulation standard!
Now I stumbled over the sentence below regarding the thermal envelope and wanted to ask what exactly this means?
How is this envelope composed? Is it necessary to build such an envelope? Is there another "Energy Saving Regulation envelope"?
Thanks in advance!
Excerpt from the text:
D: Shell construction work
Wall and ceiling thicknesses, material selection, steel reinforcements, concrete grades, and mortar classes will be executed according to the thermal insulation calculation and insulation requirements, structural demands, and currently valid technical standards.
The thermal envelope will be constructed as an Energy Efficiency House KFW 70 (status 2014).
d) Concrete and reinforced concrete work
The foundation consists of an in-situ concrete slab made of waterproof concrete on a gravel filter layer. The exterior basement walls will be built as single-shell Poroton walls, thickness 36.5cm (14.4 inches) T9. Floor slabs are precast solid slabs with cast-in-place topping, designed according to structural, acoustic, and thermal requirements. A stainless steel foundation earth electrode with appropriate connection points will be installed beneath the slab.
The floor slab will be insulated externally with perimeter insulation WLG 035, thickness 10cm (4 inches).
e) Masonry work
The exterior walls will be made as single-shell Poroton walls, 36.5cm (14.4 inches) thick, built according to the energy calculation. Interior partition walls will be constructed with hollow bricks. External roller shutters will be installed above the window openings integrated into the outer wall. The chimney will be built according to heating output and heating technology, with a chimney head cover above the roof (sheet metal or fiber cement). Additionally, a separate chimney is provided for a future wood stove installation on the ground floor.
f) Insulation work
The exterior basement walls will be coated with cement mortar and a thick protective coating with drainage panels and filter fleece will be applied. Drainage pipes with appropriate flushing and inspection shafts.
Today we received the building specification for our cost estimate.
The house we are building will not be a KFW house, only built to the Energy Saving Regulation standard!
Now I stumbled over the sentence below regarding the thermal envelope and wanted to ask what exactly this means?
How is this envelope composed? Is it necessary to build such an envelope? Is there another "Energy Saving Regulation envelope"?
Thanks in advance!
Excerpt from the text:
D: Shell construction work
- General
Wall and ceiling thicknesses, material selection, steel reinforcements, concrete grades, and mortar classes will be executed according to the thermal insulation calculation and insulation requirements, structural demands, and currently valid technical standards.
The thermal envelope will be constructed as an Energy Efficiency House KFW 70 (status 2014).
d) Concrete and reinforced concrete work
The foundation consists of an in-situ concrete slab made of waterproof concrete on a gravel filter layer. The exterior basement walls will be built as single-shell Poroton walls, thickness 36.5cm (14.4 inches) T9. Floor slabs are precast solid slabs with cast-in-place topping, designed according to structural, acoustic, and thermal requirements. A stainless steel foundation earth electrode with appropriate connection points will be installed beneath the slab.
The floor slab will be insulated externally with perimeter insulation WLG 035, thickness 10cm (4 inches).
e) Masonry work
The exterior walls will be made as single-shell Poroton walls, 36.5cm (14.4 inches) thick, built according to the energy calculation. Interior partition walls will be constructed with hollow bricks. External roller shutters will be installed above the window openings integrated into the outer wall. The chimney will be built according to heating output and heating technology, with a chimney head cover above the roof (sheet metal or fiber cement). Additionally, a separate chimney is provided for a future wood stove installation on the ground floor.
f) Insulation work
The exterior basement walls will be coated with cement mortar and a thick protective coating with drainage panels and filter fleece will be applied. Drainage pipes with appropriate flushing and inspection shafts.
Bauexperte schrieb:
Oh yes – and equipped with a foundation earthing conductor under the concrete slab, which is actually only required for special sealing – commonly from the so-called "white tank" onwards.This is not entirely correct.
It is true that a separate ring earth conductor is definitely required for a white tank foundation. However, this does not replace the equipotential bonding WITHIN the concrete slab. A separate ring earth conductor is also required when an increased soil-to-electrode resistance is expected. Proper installation of a ring earth conductor is definitely not beneath the concrete slab because that area is dry.
A ring earth conductor is regularly necessary since hardly any concrete slab is built without a capillary-breaking gravel layer with a blinding layer, and insulation is often installed beneath the slab.
Warning: There is still a lot of poor workmanship in the area of earthing. Such an earth conductor must only be installed by a qualified electrician – this is often ignored by the structural workers. There are also documentation requirements, e.g., drawings and photographic records of all connections, joiners, etc.
Below are some excerpts from DIN 18014:
3.4
Foundation earthing conductor
A conductive part embedded as a closed ring in the concrete of a building’s foundation
3.5
Ring earth conductor
A conductive part embedded as a closed ring in the soil outside a building’s foundation
Note 1 regarding the term: The ring earth conductor is referred to in DIN VDE 0100-540 (VDE 0100-540) as a “foundation earthing conductor laid in the soil”.
[...]
According to this standard, a foundation earthing conductor is an earth conductor embedded in concrete. If a concrete foundation is executed with an increased earth-to-electrode resistance for structural reasons, the foundation earthing conductor must be installed in the soil and is then called a ring earth conductor.
[...]
If a ring earth conductor is installed outside the building foundations, an additional functional equipotential bonding conductor is necessary for potential control within the building’s foundations.
[...]
5.3 Ring earth conductor
The ring earth conductor must be installed in direct contact with the soil outside the foundations.
To achieve a constant, low soil resistivity, the ring earth conductor must be installed in a moisture-retaining, frost-free area outside the foundation in direct earth contact.
NOTE This is especially important in cases such as large roof overhangs.
Installation examples:
laterally in the working area of the excavation pit, possibly below a drainage layer (see Figure 5a), or
below the foundation at the exterior walls (see Figure 5b), or
outside a frost protection screed (see Figure 5c).
[...]
5.7 Foundations with increased earth-to-electrode resistance
5.7.1 General
If the required soil contact of the earth conductor in the foundation is not given, e.g., due to the use of:
waterproof concrete according to DIN EN 206 and DIN 1045-2 (white tank), see Figure 9;
bitumen-based waterproofing (black tank), e.g., bitumen membranes, plastic-modified bitumen thick coatings (KMB), see Figure 10;
tough plastic membranes;
thermal insulation (perimeter insulation) on the underside and sides of the foundations, see Figure 11;
additionally applied, capillary-breaking, poorly electrically conductive soil layers, e.g., recycled materials,
a ring earth conductor must be installed.S
Sebastian7930 Mar 2016 09:49The DIN standard is not a law – this is often conveniently forgotten.
By the way, we don’t have gravel under the clean concrete layer or any insulation – but the dreaded structural builder still installed the floor heating.
By the way, we don’t have gravel under the clean concrete layer or any insulation – but the dreaded structural builder still installed the floor heating.
Sebastian79 schrieb:
The DIN standard is not a law – this is often conveniently forgotten. If someone asks you about IT baseline protection, do you then tell them that ISO 27001 is not a law and you don’t need it?
S
Sebastian7930 Mar 2016 09:57An ISO standard is a matter governed by the state, while the DIN standard is purely private-sector. I just want to point out that no one is violating any law here, as is often suggested.
There are officially recognized building standards that effectively have the force of law. However, to the best of my knowledge, DIN 18014 is not one of them.
You are not violating any law if you do not install your foundation earth electrode according to DIN 18014.
However, in order to get an electrical connection from the utility provider, they require a certification from the electrician confirming that a foundation earth electrode in compliance with DIN 18014 is in place. Without this certification, no electrical connection will be granted.
If the electrician confirms this, even though it is not the case, just to satisfy the builder (which often happens), then the legal violation you denied occurs, and this enters the realm of criminal liability.
You are not violating any law if you do not install your foundation earth electrode according to DIN 18014.
However, in order to get an electrical connection from the utility provider, they require a certification from the electrician confirming that a foundation earth electrode in compliance with DIN 18014 is in place. Without this certification, no electrical connection will be granted.
If the electrician confirms this, even though it is not the case, just to satisfy the builder (which often happens), then the legal violation you denied occurs, and this enters the realm of criminal liability.
B
Bauexperte30 Mar 2016 10:19Hello,
The building envelope initially has nothing to do with the internal structure; it is one of many factors to comply with the applicable Energy Saving Ordinance or to construct an "energetically" more efficient building.
Regards, Bauexperte
Duke Nukem schrieb:Sender + receiver; always full of misunderstandings
My questions were probably not clearly defined, sorry!
Duke Nukem schrieb:I guess you need to work on the terminology; there are many helpful posts on this forum for that! I also detect a certain naivety in your posts (though I might be mistaken), which is why I would recommend visiting a construction consultancy, the VBZ, the Association of Private Homeowners, or similar organizations.
I meant the internal structure of the building envelope, of course. I wanted to ask what the difference is between the KfW-70 envelope and the Energy Saving Ordinance.
The building envelope initially has nothing to do with the internal structure; it is one of many factors to comply with the applicable Energy Saving Ordinance or to construct an "energetically" more efficient building.
Duke Nukem schrieb:Above all, you have to build according to the applicable Energy Saving Ordinance. Since the current Energy Saving Ordinance is only marginally "worse" than the KfW 70 efficiency house that was subsidized until 31.03.16, in my opinion, you will not save a noticeable amount if you base it solely on the Energy Saving Ordinance.
I do not want to build according to the KfW standard. Can I suggest an Energy Saving Ordinance envelope to the site manager and thus save money, or is the small difference not really worth it? Of course, it’s nice to save money, but if it is only a small amount, I don’t want to cut corners in the wrong place!
Duke Nukem schrieb:Because these days, basements are mostly constructed using sandwich precast elements. I am only surprised that there are providers who offer a masonry basement as standard. Whether and how it needs to be sealed in a special way—e.g., as watertight masonry—depends on the soil report, which should hopefully be part of the services owed by your chosen provider or otherwise commissioned by you on site.
Why is a masonry basement unusual? Should I ask about a different method?
Duke Nukem schrieb:Yes, as Sir has already explained very well, and at the same time has compensated for my abbreviated answer on this matter
What is the purpose of the stainless steel foundation earth electrode and do I really need it?
Regards, Bauexperte
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