Hi, Suhaib

Welcome to RE forums....

No need to ask the same question in different forums ...only making confusion .... that is the reason for deleting.

We are not paid for our work here (we are working in some other place to provide our daily bread) and sometime you need to be patient until you get some answer ...


Quote Originally Posted by Suhaib View Post
Hello Everyone,

we have a freezer floor which is 21 m2 inside meat factory, it's operation temperature is -18 C, it kept rising till it reach 25 cm, where we decided to stop it from working.

i have done some google and i have found the reason of ice building up below slab, so i suggested to repair the floor and install underfloor heating system, which i have no experience in such systems.

what i have found that we can install electric heating system or heating system using water mixed with glycol that operate by heat pump or gas boiler

for these tow different systems i have some questions:
1) what is preferred underfloor heating system using electric heaters or water with glycol? (pls let me know what are advantages and disadvantages)

2) what is the required energy flow by the system (i have read that it is 30W/m2, but i think it is little, am i right)?

3) how can we check and do necessary maintenance for the system if it would be covered with concrete?

4) does underfloor heating system affect the efficiency of freezing inside the room, or make losses for freezing unit?

5) what is the preferred for the floor, to use tiling or epoxy coating?

6) for the layers, i have read that floor layers order should be as following: (vapor barrier, slab of concrete 10 cm, insulation layer 15 cm, heating system, concrete slab 15 cm)? is the order right? any additional layers?

thanks for everyone who help little experienced man
I will try to answer some of your questions:

1. undefloor heating system depend on your facility ... if you have installation with warm glycol water you can use that one ... now that will be quite expensive to install ....my suggestion is to install electrical trace heating (http://www.flexelec.com/) , but double for safety ...

2. I am not sure about but you can ask manufacturer about ...

3. it will be covered with concrete and you have to do checks during installation before you cover heating cables with concrete

4. no

5. depend on your use ...sometimes tiling ... but maybe in the freezer room epoxy is better

6. from bottom to the top ...

0. dry and healthy soil
0.0 it is also possible to make one slab of 70-80-100 mm to flatten the floor
preparation for vapor barrier - but total price is rising -

1. good poly sheet vapor barrier - must be also on the vertical walls ...
2. heat tracing (my advice - double one working and one spare)
3. polystyrene insulation 300 mm
4. covering paper
5. finished reinforced concrete 100-150 mm
6. epoxy or tiling cover

... you will be surprised when you start to remove frozen soil under your freezer room ...maybe you have to dig 2+ meters to come to not frozen soil.

try to avoid cold bridge between floor and insulation panel walls - wall panel must go down to polystyrene layer ...

to be honest, this is job for professional company ... to give you warranty ...

Hope this will be of some help to you

Best regards, Josip