Elementary School in Mulhouse - Polyurethane-foam insulation - 80 mm
Solution Year
2015
Building Age
1700-1800
Listed Building
Yes
Conservation Area
No
Documenting Institution
STRESS
Location
Mulhouse, France - 301m
Building Type
Educational/Research
Structure
Stone masonry wall
The Building
Building pre-intervention
Building post-intervention
Elementary School in Mulhouse
This hard-stone elementary school is located in Mulhouse in the Alsace region (north-eastern France), near the border with Germany. It is a listed building, as it witnesses the history of the city of Mulhouse : it first was a spinning factory at a time which Mulhouse was well-known for its textile industry and became a school after the annexation of Alsace and Moselle by Germany in 1870. The school was never insulated before. A fuel boiler was installed in a technical room in the ground floor. The heat is distributed throughout the building by water circulating through pipes. Domestic hot water was provided by instant electric heaters, installed in sANITations.
More DetailsThe Solution
Solution pre-intervention
Solution post-intervention
What is the Solution?
The ground floor sits on a concrete slab. It was insulated with 8 cm of polyurethane and an underfloor heating was installed above.
Why Does it work?
Original ground floor were replaced long ago. Therefore, there is no real issue about conservation compatibility. Regarding the high ceilings, adding insulation on the ground floor did not have a noticeable impact on floor level.
PROS
- The U-value of the floor is improved.
- Possibility of installing an underfloor heating
- Simplicity of installation
CONS
- it was necessary to remove the existing attic/floor and replace it
Insulation material
polyurethane
Insulation thickness
80
Thermal conductivity
0.022
Health issue
Off gassing from unknown 1 mm finish or an adhesive layer is possible
Additional documentation
Installation Method
The insulation was applied by removing the pre-existing flooring (non-original flooring replaced back in 1980) and inserting polyurethane panels and underfloor heating system
Moisture Management and Technical Compatibility
information not available
Airtightness
information not available
Before retrofit
After retrofit
Before retrofit
Floor thickness
201
After retrofit
Floor thickness
331
Before retrofit
Floor build-up
Old Finish unknown_ [1mm], Slab_Concrete_[200mm]
After retrofit
Floor build-up
NewFinish_unknown_ [1mm], Underfloor heating_[50mm],
Insulation Polyurethane [80mm],
Slab_Concrete_[200mm]
Before retrofit
U-value
1.7
After retrofit
U-value
0.35
Assessment
Floor type
Slab
Insulaiton position
Above the load bearing structure
Flooring maintained
No
Floor U-value
0.333 < U <= 0.5
Insulation type
Synthetic
Circular approach
No
Reversibility
No
Investment cost
High
Location
Mulhouse, France - 301m
Climatic Zone:Cfb
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