Insulation help

I am planning to construct a house at bahria town, phase8 rwp, and employ jumbolon for insulation in both walls and roof.

My question is as under.

While putting in jumbolon boards in the walls, should i;

1. Construct 9 inches wall, administer water proofing to the interior, let it dry up, and put in jumbolon boards afterwards. Then go on about enhancing that with a plastic sheet and later cover that up with a 4.5 inches wall.

2. Put the jumbolon in tandem with wall construction as the construction progresses and make a 4.5 inches wall right after, in one go.

@HT @ARMCO @Dsa @B.R Malik . Would appreciate your comments.