Hello everyone,
we are building a single-family house to KfW55 standard with an architect.
Now the architect told us that we should consider the masonry.
I had already thought about it. I was considering a filled brick with perlite, T7P or T8P.
He said there is a company in the area that produces good filled blocks and gave me a sample of a Liapor block filled with rigid foam, the M6 (M for Meier).
It actually makes a good impression. Liapor is said to absorb less water than bricks, so that's potentially an advantage. The price is about 10 cents more expensive.
“The rigid foam has a thermal conductivity λ\[R\] = 0.022 W/m²·K, which provides twice the thermal insulation compared to a natural insulation material (e.g., perlite λ\[R\] = 0.045 W/m²·K).”
Has anyone already had experience with this block? Is rigid foam a durable solution in the long term? Please, no speculators, only experts.
I couldn’t find any information about this block on the internet.
Only other blocks appear.
But someone must have already used this block in construction, right?!
Thanks for constructive information
KF55W
we are building a single-family house to KfW55 standard with an architect.
Now the architect told us that we should consider the masonry.
I had already thought about it. I was considering a filled brick with perlite, T7P or T8P.
He said there is a company in the area that produces good filled blocks and gave me a sample of a Liapor block filled with rigid foam, the M6 (M for Meier).
It actually makes a good impression. Liapor is said to absorb less water than bricks, so that's potentially an advantage. The price is about 10 cents more expensive.
“The rigid foam has a thermal conductivity λ\[R\] = 0.022 W/m²·K, which provides twice the thermal insulation compared to a natural insulation material (e.g., perlite λ\[R\] = 0.045 W/m²·K).”
Has anyone already had experience with this block? Is rigid foam a durable solution in the long term? Please, no speculators, only experts.
I couldn’t find any information about this block on the internet.
Only other blocks appear.
But someone must have already used this block in construction, right?!
Thanks for constructive information
KF55W
Hello,
Aerated Concrete (Ytong is a 'manufacturer')
This is a highly insulating solid building material that, due to its closed-cell pore structure, can fulfill both structural and building physics functions—usually without additional measures or supplementary materials. It is made from local raw materials and has the almost unlimited lifespan typical of solid building materials.
Thermal Insulation:
Aerated concrete is the only solid building material with a thermal conductivity starting at 0.09 W/(mK) in the density classes 0.30, 0.35, and 0.40. This means that even a single-layer 30 cm (12 inches) thick wall provides a thermal transmittance value (U-value) of 0.28 W/(m²K). With a wall thickness of 36.5 cm (14.4 inches), the U-value drops to 0.23. In exterior walls, the requirements of energy saving regulations (building permit/planning permission) can be met or even exceeded without additional insulation. Furthermore, the homogenous wall construction allows for nearly thermal bridge-free designs. A plastered single-layer aerated concrete wall is considered airtight according to energy saving regulations without additional measures.
Thermal Mass:
The thermal mass of aerated concrete falls between the extremes of lightweight construction (e.g., timber frame construction with about 50 kJ/m²K) and solid construction (e.g., masonry or reinforced concrete with about 250 kJ/m²K). The corresponding value for an aerated concrete wall is approximately 90 kJ/m²K.
Thermal Conductivity:
Due to the very low thermal conductivity of 0.09 W/(mK), the energy saving requirements can be fulfilled with aerated concrete in monolithic construction. A multilayer wall assembly, as is common with other materials, is not necessary.
Vapor Diffusion Resistance:
Because of its porous structure, aerated concrete has a low water vapor diffusion resistance factor, ranging between µ = 5 and µ = 10.
Building Biology:
Aerated concrete is a natural raw material that is transformed chemically and mineralogically. This process produces a product that usually outperforms natural raw materials and is much better suited for building structures that meet high living standards.
Sound Insulation:
Aerated concrete challenges the physical principle that "the heavier a building element, the better the airborne sound insulation," because its pore structure provides a kind of internal damping. The DIN 4109 standard takes this into account: aerated concrete walls with an area mass up to 250 kg/m² (51 lb/ft²) receive a bonus of 2 dB. Recent component measurements show even further improvements. Walls and solid roofs made of aerated concrete can cover all external noise levels from a sound protection perspective. According to suitability test III for DIN 4109, double-leaf party walls made of aerated concrete with two 17.5 cm (6.9 inches) PP4-0.6 blocks and a 50 mm (2 inches) cavity fully filled with mineral insulation meet the requirements for enhanced sound insulation.
Fire Protection:
With aerated concrete, you are on the safe side in case of fire. It is a mineral-based, non-combustible building material. According to DIN 4102, it is classified as building material class A1 and, depending on the design, can be used for all fire resistance classes from 30 minutes up to F 180 (180 minutes). A 7.5 cm (3 inches) thick unplastered, non-load-bearing wall made of aerated concrete already meets all requirements for fire resistance class F 90. Walls starting at 24 cm (9.5 inches) thickness of PP 2-0.4 aerated concrete are considered firewalls. Ceilings and roofs made of aerated concrete comply with fire resistance classes from F 30 up to F 180.
Expanded Clay Aggregate or Lightweight Concrete from Liapor
Lightweight concrete blocks made from expanded clay are produced essentially using the normal concrete block manufacturing process, but using expanded clay instead of regular aggregate to reduce density and thermal conductivity. Expanded clay is artificially produced by shaping ground clay into small pellets and firing them at temperatures of 1100-1200°C (2012-2192°F). Organic materials naturally present or added in the clay burn off, and combustion gases expand the pellets, creating fine pores inside. A relatively dense outer shell forms on the surface.
Thermal Insulation:
The excellent “natural” insulation combined with a thermal insulation composite system easily meets legal requirements.
Thermal Mass:
Expanded clay heats up very slowly during the day and stores the heat. At night, it releases heat slowly. Expanded clay keeps the house cool during the day and comfortably warm at night.
Vapor Diffusion:
Expanded clay is sintered and closed-cell, preventing moisture absorption. The wall elements are breathable and ensure moisture exchange in the air. This is a key advantage for healthy and comfortable indoor climate.
Building Biology:
Expanded clay is natural. It is resource-saving and produced without chemical additives. One cubic meter of raw clay yields up to 5 cubic meters of expanded clay pellets with excellent building biology properties.
Sound Insulation:
Sound always follows the path of least resistance. In a wall made of expanded clay, the sound must take a detour around each pellet, traveling a much longer distance and significantly reducing its intensity.
Fire Protection:
During the production of expanded clay pellets at 1100-1200°C (2012-2192°F), all organic components are burned off. External walls made of expanded clay belong to the highest fire protection class F180.
Hollow Clay Blocks
Bricks, as a natural building material, have been widely used for thousands of years. Due to their capillary structure, bricks act as natural moisture regulators. They can absorb, store, and release indoor moisture quickly under favorable outdoor conditions. Thermal insulation through bricks prevents rooms from cooling down too quickly during heating interruptions. During hot seasons, bricks store heat accumulated inside rooms due to their thermal mass.
Thermal Insulation:
The heat absorbed from the interior by massive brick walls is only returned to the interior when it is cooler outside, allowing surplus heat to be expelled through natural ventilation. This capability of bricks for phase shifting and amplitude damping of temperature has historically been utilized in southern countries through massive brick houses without additional air conditioning.
Thermal Protection:
Depending on the raw density and thermal resistance (R-value), bricks have very good insulating properties. Lightweight bricks with a raw density of 0.8 kg/dm³ or 0.9 kg/dm³ and lightweight mortar LM 36 can easily achieve thermal transmittance values (k-values) below 0.40 W/m²K at a common wall thickness of 36.5 cm (14.4 inches).
Thermal Conductivity:
Walls made of hollow clay blocks without filling have higher thermal conductivity in the vertical direction, especially when built with traditional thin-bed mortar that does not reliably seal the holes (convection!).
Vapor Diffusion Resistance:
Monolithic brick masonry made from insulating hollow clay blocks can reach thermal conductivities of about 0.14 W/mK and, at 36.5 cm (14.4 inches) thickness with plaster on both sides, achieve a U-value of approximately 0.35 W/m²K. This requires using lightweight mortars LM 21 and un-mortared but interlocking vertical joints. Strictly speaking, this creates a three-part cross-section with brick, air-filled vertical joint, and mortar bed joint, each showing slightly different moisture protection behavior.
Building Biology:
Hollow clay blocks meet the requirements of ecological building and building biology.
Sound Insulation:
Single-layer exterior walls 30 cm (12 inches) or 36.5 cm (14.4 inches) thick made of lightweight bricks with lightweight mortar and plastered on both sides generally meet the requirements of DIN 4109 "Protection against External Noise." The sound insulation requirements for partition walls in DIN 4109 are easily fulfilled by walls made of bricks with raw densities up to 2.4 kg/dm³.
Fire Protection:
Bricks already undergo intense firing for the builder’s safety. Walls made from brick, plastered on both sides, meet the fire resistance class F90 "fire-resistant" requirements according to DIN 4102 even with a thickness of 11.5 cm (4.5 inches).
Yes.
Source: Construction Expert
Best regards
Aerated Concrete (Ytong is a 'manufacturer')
This is a highly insulating solid building material that, due to its closed-cell pore structure, can fulfill both structural and building physics functions—usually without additional measures or supplementary materials. It is made from local raw materials and has the almost unlimited lifespan typical of solid building materials.
Thermal Insulation:
Aerated concrete is the only solid building material with a thermal conductivity starting at 0.09 W/(mK) in the density classes 0.30, 0.35, and 0.40. This means that even a single-layer 30 cm (12 inches) thick wall provides a thermal transmittance value (U-value) of 0.28 W/(m²K). With a wall thickness of 36.5 cm (14.4 inches), the U-value drops to 0.23. In exterior walls, the requirements of energy saving regulations (building permit/planning permission) can be met or even exceeded without additional insulation. Furthermore, the homogenous wall construction allows for nearly thermal bridge-free designs. A plastered single-layer aerated concrete wall is considered airtight according to energy saving regulations without additional measures.
Thermal Mass:
The thermal mass of aerated concrete falls between the extremes of lightweight construction (e.g., timber frame construction with about 50 kJ/m²K) and solid construction (e.g., masonry or reinforced concrete with about 250 kJ/m²K). The corresponding value for an aerated concrete wall is approximately 90 kJ/m²K.
Thermal Conductivity:
Due to the very low thermal conductivity of 0.09 W/(mK), the energy saving requirements can be fulfilled with aerated concrete in monolithic construction. A multilayer wall assembly, as is common with other materials, is not necessary.
Vapor Diffusion Resistance:
Because of its porous structure, aerated concrete has a low water vapor diffusion resistance factor, ranging between µ = 5 and µ = 10.
Building Biology:
Aerated concrete is a natural raw material that is transformed chemically and mineralogically. This process produces a product that usually outperforms natural raw materials and is much better suited for building structures that meet high living standards.
Sound Insulation:
Aerated concrete challenges the physical principle that "the heavier a building element, the better the airborne sound insulation," because its pore structure provides a kind of internal damping. The DIN 4109 standard takes this into account: aerated concrete walls with an area mass up to 250 kg/m² (51 lb/ft²) receive a bonus of 2 dB. Recent component measurements show even further improvements. Walls and solid roofs made of aerated concrete can cover all external noise levels from a sound protection perspective. According to suitability test III for DIN 4109, double-leaf party walls made of aerated concrete with two 17.5 cm (6.9 inches) PP4-0.6 blocks and a 50 mm (2 inches) cavity fully filled with mineral insulation meet the requirements for enhanced sound insulation.
Fire Protection:
With aerated concrete, you are on the safe side in case of fire. It is a mineral-based, non-combustible building material. According to DIN 4102, it is classified as building material class A1 and, depending on the design, can be used for all fire resistance classes from 30 minutes up to F 180 (180 minutes). A 7.5 cm (3 inches) thick unplastered, non-load-bearing wall made of aerated concrete already meets all requirements for fire resistance class F 90. Walls starting at 24 cm (9.5 inches) thickness of PP 2-0.4 aerated concrete are considered firewalls. Ceilings and roofs made of aerated concrete comply with fire resistance classes from F 30 up to F 180.
Expanded Clay Aggregate or Lightweight Concrete from Liapor
Lightweight concrete blocks made from expanded clay are produced essentially using the normal concrete block manufacturing process, but using expanded clay instead of regular aggregate to reduce density and thermal conductivity. Expanded clay is artificially produced by shaping ground clay into small pellets and firing them at temperatures of 1100-1200°C (2012-2192°F). Organic materials naturally present or added in the clay burn off, and combustion gases expand the pellets, creating fine pores inside. A relatively dense outer shell forms on the surface.
Thermal Insulation:
The excellent “natural” insulation combined with a thermal insulation composite system easily meets legal requirements.
Thermal Mass:
Expanded clay heats up very slowly during the day and stores the heat. At night, it releases heat slowly. Expanded clay keeps the house cool during the day and comfortably warm at night.
Vapor Diffusion:
Expanded clay is sintered and closed-cell, preventing moisture absorption. The wall elements are breathable and ensure moisture exchange in the air. This is a key advantage for healthy and comfortable indoor climate.
Building Biology:
Expanded clay is natural. It is resource-saving and produced without chemical additives. One cubic meter of raw clay yields up to 5 cubic meters of expanded clay pellets with excellent building biology properties.
Sound Insulation:
Sound always follows the path of least resistance. In a wall made of expanded clay, the sound must take a detour around each pellet, traveling a much longer distance and significantly reducing its intensity.
Fire Protection:
During the production of expanded clay pellets at 1100-1200°C (2012-2192°F), all organic components are burned off. External walls made of expanded clay belong to the highest fire protection class F180.
Hollow Clay Blocks
Bricks, as a natural building material, have been widely used for thousands of years. Due to their capillary structure, bricks act as natural moisture regulators. They can absorb, store, and release indoor moisture quickly under favorable outdoor conditions. Thermal insulation through bricks prevents rooms from cooling down too quickly during heating interruptions. During hot seasons, bricks store heat accumulated inside rooms due to their thermal mass.
Thermal Insulation:
The heat absorbed from the interior by massive brick walls is only returned to the interior when it is cooler outside, allowing surplus heat to be expelled through natural ventilation. This capability of bricks for phase shifting and amplitude damping of temperature has historically been utilized in southern countries through massive brick houses without additional air conditioning.
Thermal Protection:
Depending on the raw density and thermal resistance (R-value), bricks have very good insulating properties. Lightweight bricks with a raw density of 0.8 kg/dm³ or 0.9 kg/dm³ and lightweight mortar LM 36 can easily achieve thermal transmittance values (k-values) below 0.40 W/m²K at a common wall thickness of 36.5 cm (14.4 inches).
Thermal Conductivity:
Walls made of hollow clay blocks without filling have higher thermal conductivity in the vertical direction, especially when built with traditional thin-bed mortar that does not reliably seal the holes (convection!).
Vapor Diffusion Resistance:
Monolithic brick masonry made from insulating hollow clay blocks can reach thermal conductivities of about 0.14 W/mK and, at 36.5 cm (14.4 inches) thickness with plaster on both sides, achieve a U-value of approximately 0.35 W/m²K. This requires using lightweight mortars LM 21 and un-mortared but interlocking vertical joints. Strictly speaking, this creates a three-part cross-section with brick, air-filled vertical joint, and mortar bed joint, each showing slightly different moisture protection behavior.
Building Biology:
Hollow clay blocks meet the requirements of ecological building and building biology.
Sound Insulation:
Single-layer exterior walls 30 cm (12 inches) or 36.5 cm (14.4 inches) thick made of lightweight bricks with lightweight mortar and plastered on both sides generally meet the requirements of DIN 4109 "Protection against External Noise." The sound insulation requirements for partition walls in DIN 4109 are easily fulfilled by walls made of bricks with raw densities up to 2.4 kg/dm³.
Fire Protection:
Bricks already undergo intense firing for the builder’s safety. Walls made from brick, plastered on both sides, meet the fire resistance class F90 "fire-resistant" requirements according to DIN 4102 even with a thickness of 11.5 cm (4.5 inches).
Yes.
Source: Construction Expert
Best regards
A
AallRounder16 Nov 2013 08:08honk0190 schrieb:
Aerated concrete is the only solid building material with a thermal conductivity starting at 0.09 W/(mK) in the density classes 0.30, 0.35, and 0.40. This means: A single-layer wall with a thickness of 30cm (12 inches) already provides a thermal transmittance coefficient U = 0.28 W/(m²K). With a wall thickness of 36.5cm (14 inches), the U-value decreases to 0.23.
In the exterior wall area, the requirements of the Energy Saving Ordinance (building permit / planning permission) can thus be met and even exceeded without additional insulation measures. Furthermore, the homogeneous wall structure allows for nearly thermal-bridge-free construction. A plastered single-layer wall made of aerated concrete is considered airtight in terms of the Energy Saving Ordinance without additional measures. So why spoil this excellent building material with polystyrene insulation? Any gain is purely theoretical; in reality, you introduce a critical insulation material into the wall that has very poor water vapor diffusion capacity.
There is nothing more to add from a physical perspective to the "building experts’" explanations. I was very satisfied with my prefabricated house made homogeneously from Liapor, with no thermal bridges and no additional insulation. Besides, I had the construction company off-site faster than it would have been with traditional masonry.
Similar topics