Electric heating mat over metal screws?

[samshimeld]

Hello,

The floor boarding has been stuck down with adhesive and screwed down also with extra metal washers.

Someone has now told me it is not a good idea to put an Electrical Heating Mat over it beacuse of the metal screwes and washers.

Can I just take them out? Help

It will then be screeded and tiled.

Thanks,

 

[littlespark]

The heating mat will say in the instructions what type of floor it can be used on.
Or you could ask them on their technical helpdesk if its possible.

It may need a screed layer first, then your mat... then another screed layer before tiles.

I wouldnt take the screws out myself. But ask whoever laid the floor if they can be.

 

[Baddegg]

Above put a thin layer of self leveling latex over then the mat then another thin layer jobs a goodun

 

[Vortigern]

It is just fine to do so with the wire type designed for this application. I have done it and it is just fine. Why is not a good idea. The wire does not lay on the metal washers so not a problem. Anyway they are covered by tile cement. Your problem could be the tiler puts the cement on the tile and then lays it instead of over the mat then lay the tiles on that.

 

[mattg4321]

The screws and washers are fine.

 

[samshimeld]

Thank you for your reply, when tou say the wire does not lay on the metal washers, what did you mean exactly? The mat will go over the metal washers and it is very likely a wire will be going above a washer.

 

[samshimeld]

It is just fine to do so with the wire type designed for this application. I have done it and it is just fine. Why is not a good idea. The wire does not lay on the metal washers so not a problem. Anyway they are covered by tile cement. Your problem could be the tiler puts the cement on the tile and then lays it instead of over the mat then lay the tiles on that.

Thank you for your reply, when you say the wire does not lay on the metal washers, what did you mean exactly? The mat will go over the metal washers and it is very likely a wire will be going above a washer.

 

[Vortigern]

Due to the tiler making sure there is a bed to lay the mat on.

 

[samshimeld]

Due to the tiler making sure there is a bed to lay the mat on.

Hi Vortigen, do you mean if the tiler self leveling concrete over the boarding before laying the mat down? At present the plan is to put the mat directley onto the boarding without a bed.

 

[Baddegg]

Hi Vortigen, do you mean if the tiler self leveling concrete over the boarding before laying the mat down? At present the plan is to put the mat directley onto the boarding without a bed.

Any decent tiler will put a layer of self leveling over the mat before tiling

 

[samshimeld]

Any decent tiler will put a layer of self leveling over the mat before tiling

Yes that is the plan, the electric mat is being stuck to the wedi board, then a layer of self leveling over the matt and then tiled. The issue i have got is i have been told the mat shouldnt be stuck to the wedi board beacuse of the metal washers.

Do yout think the tiler should put a level of self levelling on the wedi board, then stick the mat to that, the add self levelling on top of the mat before tiling?

 

[littlespark]

I'll repeat what i said on #2.

There will be instructions with the mat on how to lay it.
More importantly, what it can be laid on. Some don't like straight onto wood

 

[Baddegg]

Yes that is the plan, the electric mat is being stuck to the wedi board, then a layer of self leveling over the matt and then tiled. The issue i have got is i have been told the mat shouldnt be stuck to the wedi board beacuse of the metal washers.

Do yout think the tiler should put a level of self levelling on the wedi board, then stick the mat to that, the add self levelling on top of the mat before tiling?

At the end of the day, if you are concerned, personally I don’t think it a issue but that’s only my opinion, put some insulting material over the screw heads, electricial tape or something similar, or as I said earlier, prime the floor put a thin barrier screed of latex down let that dry prime again then put your mat down and put another layer of latex over the mat, second layer is only to make the tiling easier, personally I bond the boards the the sub floor (normally ply screws at approx 100mm centres) with a flexible tile adhesive and then there’s no screws