How Best To Insulate On Floor Boards

[Deleted member 46379]

Hi, my first post on here

Just starting new project in lounge and hallway, approx 40m area, to install Electric UFH. Plan is to have marble tiles.

I just need help with the different options available on how to best insulate the floor underneath as it just floorboards on joists with a cellar underneath it.

The builder has suggested replacing the floorboards with insulating boards but I'm not too keen on losing my long-lasting solid floorboards that have been in the house for decades. So to keep my floorboards what can I do? Can you also plz recommend which brands of UFH and insulation to get?

Thanks.

 

[Tile seller]

How about thermonets uncoated insulation boards (thermoboards) and their vario pro UFH system.
The Vario pro will uncouple the marble too which will be a bonus.

 

[Stef]

Thermal boards glued & screwed to your subfloor (floorboards)
Your maximum size of a heat mat will be 10m2 so you would need 4 mats unless you went to a loose wire system.
Would need to encase that into a self level screed & then tile.

 

[Flintstone]

Cement coated insulation boards stuck down with tile adhesive and screwed.
Why a 10m limit on Ufh wire size ? I've layed kits as big as 19m in a single roll/kit

 

[Stef]

Cement coated insulation boards stuck down with tile adhesive and screwed.
Why a 10m limit on Ufh wire size ? I've layed kits as big as 19m in a single roll/kit

I've never seen a heat mat bigger than 10m2, that's a new one on me..

 

[Flintstone]

ProWarm™ Electric underfloor heating 100w mat kit - Underfloor Heating Mat Kits - ProWarm™ - Electric Underfloor Heating

30m kit on there

 

[Stef]

ProWarm™ Electric underfloor heating 100w mat kit - Underfloor Heating Mat Kits - ProWarm™ - Electric Underfloor Heating

30m kit on there

Don't quote me on it but I'm certain to cover 30m2 you need to loop 3 10m2 mats together.
That used to be the case.

 

[hmtiling]

ProWarm™ Electric underfloor heating 100w mat kit - Underfloor Heating Mat Kits - ProWarm™ - Electric Underfloor Heating

30m kit on there

that won't be one mat. if you click on 30m2 it shows you 2 mats

 

[Flintstone]

Ah perhaps! I have deffo used a 19m mat tho I'm one roll

 

[Old Mod]

Devimat go up to 12m2
And they do kits up to 22m2 but they are dual mats.

 

[hmtiling]

Think the lower wattage ones can go bigger. Not sure though

 

[Flintstone]

150w pro warm I fitted

 

[Just Rizzle]

try schulter ufh system .
as wood is a natural insulator the schluter system lay on top and tile .will keep your height down to a minimum