decoupling membrane over hardi

[judge]

So i can work out a price for the decoupler,how much extra addy will i use sticking the membrane down and then filling the surface? Is it best to fill the surface and let dry or fill it as you lay the tile ? Theres only one other quote for this job and the customer told me the other tiler was going to use a "highly flexible" adehsive and lay straight to the chipboard surface !!!!!!!!!. Ive told the customer my quote is going to be more expensive because I will be installing the tile correctly so i want to be as competitive as possible with this quote.(Theres also 2 bathrooms and 2 onsuites for wall tiling aswell

 

[J Sid]

I work on 1 20kg bag of adh will do 5 m2 to stick detra down and 1 20 kg bag to do 2 to 3 m2 to stick tiles and i always fill holes and lay at the same time, this includes back buttering the tiles.

 

[judge]

thanks jul,I can sort a quote out now