[Strawbale] Thermo floor from snail-houses/mussels

SVEN AERTS aertssven at mac...
Fri Jan 17 04:35:17 CET 2003


   |  |
   |  | Chimney for airco in summer
   |  |
   |  |
///|  |//////  Floor U walk on + floor-
+++|  |=====  concrete       | heating
+++|  |+++++  metal grid reinforcing
===|  |=====  concrete  | the concrete
***|  |*****  PE-Foil
AAA|  |AAXAA Mussels-Cement milk
AAA|  |AAXAA Mussels-Cement milk
AAA|  |AAXAA Mussels-Cement milk
AAA|  |AAXAA Mussels-Cement milk
AAA|  |AAXAA Mussels-Cement milk
AAA|  |AAXAA Mussels-Cement milk
AAA|  |AAXAA Mussels-Cement milk
AAA|  |AAXAA Mussels-Cement milk
AAXAAAAAXAAA Mussels-Cement milk
AAXAAAAAAAXA Mussels-Cement milk

Mussel-thermo-floor as an isolating, carrying and durable
supplement between the floor plate and the full ground, which replaces
the basement and the use of heat-insulation-plates in an advantageous
The distance between the shells (mustn't be mussel shells, better even
snail-shells) caught in the net of cement-milk is going to be too wide for
capillary effects to carry the ground water all the way up to the floor

Thickness mussel-layer in cm     15     20     25     30     35     40

Heatresistance         in m¾*K/W 1    1,33    1,67    2    2,33    2,67

coÎff. k               in W/m¾K    0,82    0,64    0,52    0,45    0,39
thermofloor + 
concrete layer 8 cm)

k=amount of heat transferred through the layer over a surface of 1 cm2 and
per second at 1 K temperature difference between two sides of the


Admissible static and evenly divided charge floor cover with a
reinforced metal-grid/concrete plate of 7-9 cm thick, amount to estimated
3-4 kN/m¾, or a point charge of 2-3 kN on a randomly chosen basis of 10 cm x
10 cm.  The thermofloor can be charged with a not carrying wall of maximum 5
kN per stretching meter. Carrying walls, chimneys, etc. must be built always
on their own foundation.

Advantage: reduction of foundation building work: floor rests entirely on
the mussel-layer - stabilised sand is superfluous.  Thanks to the larger
thickness of the layer versus classical foundation techniques, the
foundation's isolation factors are considerably increased.
Low heat-conductivity - estimated at less than 0.12 W/mK.
Results from air captured between the shells. A layer of 20 cm thick,
generally the depth of the leveling, limit warmth losses with regard to
not-isolated floors by 40 %. - thus limiting warmth losses but also raising
the temperature of the floor, as a result of which the comfort raises and
the danger for condensation reduces.


The composition of cement milk is as follows: 50 kg cement (CEM I 42.5) + 50
l water give 65 l cement milk. During the processing cement milk must remain
Stabilised layer cannot be tred upon before it has sufficiently hardened (in
normal circumstances 24 up to 48 hours).  On top of that you need to foresee
time for the top cement/grid/cement grid to dry.

These are the values I use in my calculatoins.
Respectfully Yours,

Engineer for the People

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Have a nice day...

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