Hello everyone,
We are considering building a timber-framed house and have already had initial meetings with several specialists in this type of construction. Over the weekend, we tried to compare the construction specifications from the different providers, and the differences become apparent starting with the foundation slab...
Two of the quotes include an energy-efficient foundation slab with underfloor heating. According to online research, this is referred to as a so-called Swedish slab, which is supposed to be good in terms of energy efficiency.
Another quote is a bit more detailed but, from what I understand, does not seem to describe an energy-efficient foundation slab, or does it?
"The foundations are made of concrete of the required strength class according to structural requirements, assuming a soil bearing capacity of 0.20 N/mm² and soil classes 3 to 4, in accordance with DIN standards. A continuous foundation of galvanized strip steel according to VDE regulations is installed. The base slab is made of waterproof reinforced concrete or waterproof fiber-reinforced concrete according to DIN 18195. Alternatively, for an additional charge, a horizontal insulation layer in the form of an overlapping and welded bituminous waterproofing can be installed."
How do these two variants affect everyday living later on? Does it take longer for the heating system to warm up, or is the energy transferred into the ground simply higher?
What is the current state of the art, and can anyone say how much more an energy-efficient foundation slab typically costs?
Thanks and best regards
We are considering building a timber-framed house and have already had initial meetings with several specialists in this type of construction. Over the weekend, we tried to compare the construction specifications from the different providers, and the differences become apparent starting with the foundation slab...
Two of the quotes include an energy-efficient foundation slab with underfloor heating. According to online research, this is referred to as a so-called Swedish slab, which is supposed to be good in terms of energy efficiency.
Another quote is a bit more detailed but, from what I understand, does not seem to describe an energy-efficient foundation slab, or does it?
"The foundations are made of concrete of the required strength class according to structural requirements, assuming a soil bearing capacity of 0.20 N/mm² and soil classes 3 to 4, in accordance with DIN standards. A continuous foundation of galvanized strip steel according to VDE regulations is installed. The base slab is made of waterproof reinforced concrete or waterproof fiber-reinforced concrete according to DIN 18195. Alternatively, for an additional charge, a horizontal insulation layer in the form of an overlapping and welded bituminous waterproofing can be installed."
How do these two variants affect everyday living later on? Does it take longer for the heating system to warm up, or is the energy transferred into the ground simply higher?
What is the current state of the art, and can anyone say how much more an energy-efficient foundation slab typically costs?
Thanks and best regards
The Sweden slab does not include a screed.
The walls are placed directly on the continuous concrete slab.
A regular slab receives a layer of fill and a screed after the walls are erected. The screed is installed as a floating screed to improve sound insulation.
The Sweden slab is inexpensive; in my opinion, that is its only advantage.
The walls are placed directly on the continuous concrete slab.
A regular slab receives a layer of fill and a screed after the walls are erected. The screed is installed as a floating screed to improve sound insulation.
The Sweden slab is inexpensive; in my opinion, that is its only advantage.
P
pffreestyler8 Sep 2020 08:41I would be very cautious with that statement. My neighbor has a Swedish slab foundation, and it was definitely not cheaper than our regular slab foundation combined with screed, because he needed special frost-resistant sand for the base, which cost almost ten times as much compared to our standard fill sand.
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