What Thickness of thermal board

[curlycan]

Hi
can anyone tell me what thickness of thermal will I need when installing my ufh. I'm installing onto concrete subtrate which is in my kitchen. The big question is Does thickness matter.:smilewinkgrin:

 

[Ajax123]

Depends on what type of insulation and what U Value you need to acheive.

 

[White Room]

The thicker the better to allow more heat reflection.

No pun intended

 

[Ajax123]

The thicker the better to allow more heat reflection.

No pun intended

Not necessarily Whitebeam. It is more to do with the R Value. for example you would get more insulation from 75mm of Polyurethane insulation than you would from 90mm of EPS70 polystyrene. Also you have to take into account the level of delfection under loading. If it is thick and spongy it would lead to a risk of high levels of defelction and subsequent failure of the tile bed. Even my Mrs knows that thick and spongy is not good........

 

[curlycan]

This sounds complicated.

I'm looking to install ufh in my kitchen, ( which has no heating) we have a permantley open window vent due to the gas boiler position. The kitchen is a galley shape and is 1m wide x 4m long the substrate is concrete. We would like as much heat coming through the tiles as possible but the hight is the key as we will get a step between the kitchen and hall way so i suppose it will depend on how big a step I can get away with.

 

[DHTiling]

10mm min... that is the norm.. on insulation boards.

 

[Ajax123]

Fastwarm® Insulation: Suitable For All Floor Heating Systems - Insulation for Underfloor heating

have a look at this - there are loads of these types of boards about so shop around for the best deals but this willl give a good starting point. In terms of the step height this is a matter of personal choice versus practicality. Assuming it is not a listed building or specialy designated for disabled use there is no regulation regarding this type of development.

 

[curlycan]

Another quickie
do you fix boards with tile addy or slc. I know you use slc when boards are down and heat mat is on top to get a good surface to tile to.

 

[DHTiling]

use a flexi cement based adhesive.. oh and Uheat do great prices on insulation boards..