1. How can I joint each panel ?
You can use Cement based glue to stick panels each other like AAC block etc..
2. After installation how will be surface finishing ?
Firstly you must fix joint lines with glue then apply Outside wall first coat plaster with fibermesh, second coat for smooth surface for the painting.
Inside wall Directly apply Gypsum 3-5mm
3. Can I use allXwall for Floor?
Yes, Same like Wall , Also for roof..
4. Can I apply tiles or parket after installation floor ?
Yes, you can directly apply tiles or parket after installation of Eps concrete wall panels
5. What's roof finishing after installation ?
Good question :) After roof panel installation you must relase traditional water resistance chemical (because water may leak jointing of panel each other) then apply your Shingle