Newbie alert!! Hi everyone. 
Apologies in advance for the impending essay!!
Anyway, regarding Under-tile insulation boards. We have P5 Chipboard suspended flooring both in the Hall and adjoining Bathroom. We understand that this isn't the ideal flooring base for tiles, but nevertheless we laid Travertine tiles in the hall with no problems (10mm tiles with 3mm adhesive bed, no heating).
Now we are going to do the bathroom and want to add heating (secondary, not primary heat source). The tiles we like are called Q-Rock Black (Topps Tiles) and are 8mm thick, which is quite thin for a floor tile, that I realise. We plan to fit heating using the loose cable, probably the 'Warmup' brand.
Our problem is this. Warmup say definately DO NOT tile onto Chipboard. Why?
So, the answer we figured is to fit backer-board of some kind, so decided to look at insulated boards as these should also reduce running costs. However, of course with the adjoining floor at 13mm, we are tight for height. Having said this, I don't mind a little difference as we are using the variable height door bars and these aren't bad.
Our choice appears to be :-
1. No backer-board. Running the risk of whatever 'Warmup' feel might happen in these circumstances and with no insulation.
2. Fit 6mm backer-board, from someone like 'Fastwarm'. This will of course keep the height down a little, taking us only 3-4mm above the adjoining floor (if we only screw them down).
3. Fit 10mm backer-board, from 'Warmup'. This will provide slightly better insulation, but take us 8mm above the adjoining floor.
On top of this, some manufacturers of boards say that their boards should be laid onto a bed of adhesive in addition to screwing them down. This would, of course add a further 3mm to the height, making the 6mm board option 6-7mm higher and the 10mm board option 11mm higher than the adjoining floor.
Please guide us as to what we should do!!
I would really like to fit the 10mm board, but aren't really sure if the 11mm differential is going to cause a major problem.
Thanks in advance!
Apologies in advance for the impending essay!!
Anyway, regarding Under-tile insulation boards. We have P5 Chipboard suspended flooring both in the Hall and adjoining Bathroom. We understand that this isn't the ideal flooring base for tiles, but nevertheless we laid Travertine tiles in the hall with no problems (10mm tiles with 3mm adhesive bed, no heating).
Now we are going to do the bathroom and want to add heating (secondary, not primary heat source). The tiles we like are called Q-Rock Black (Topps Tiles) and are 8mm thick, which is quite thin for a floor tile, that I realise. We plan to fit heating using the loose cable, probably the 'Warmup' brand.
Our problem is this. Warmup say definately DO NOT tile onto Chipboard. Why?
So, the answer we figured is to fit backer-board of some kind, so decided to look at insulated boards as these should also reduce running costs. However, of course with the adjoining floor at 13mm, we are tight for height. Having said this, I don't mind a little difference as we are using the variable height door bars and these aren't bad.
Our choice appears to be :-
1. No backer-board. Running the risk of whatever 'Warmup' feel might happen in these circumstances and with no insulation.
2. Fit 6mm backer-board, from someone like 'Fastwarm'. This will of course keep the height down a little, taking us only 3-4mm above the adjoining floor (if we only screw them down).
3. Fit 10mm backer-board, from 'Warmup'. This will provide slightly better insulation, but take us 8mm above the adjoining floor.
On top of this, some manufacturers of boards say that their boards should be laid onto a bed of adhesive in addition to screwing them down. This would, of course add a further 3mm to the height, making the 6mm board option 6-7mm higher and the 10mm board option 11mm higher than the adjoining floor.
Please guide us as to what we should do!!
I would really like to fit the 10mm board, but aren't really sure if the 11mm differential is going to cause a major problem.
Thanks in advance!