Laying Engineered board as a floating floor.

[Craka]

I'm about to start laying engineered boards through the open are of my house on a concrete slab and will lay the timber flooring underlay before laying the boards, but have a couple questions.

There is a small hallway roughly centred across width of the house, I imagine I would need 'dry' layout boards from the centre point and then adjust what boards I need to rip down at out edges and then work from a wall at the widest point? I also have a kitchen Island and cabinet that the flooring will need to fit around.

When I ordered materials, they couldn't supply one length for the material needed for the floor area and instead supplied two lengths of boards to cover the area, 12packs at 1830 and the other lot 10 packs at 2190mm , all 135mm wide boards. How should I make the best use/most efficient way of using the boards?

Also the rooms that come off the hallway are lower the what the timber floor will be and will have a transition for that however what do I do with the one that leads to the bathroom in relation to stopping potential water getting to the floor board as it will also be lower?

[droog]

Unless the hallway is a feature or the main entrance I would not be to concerned about getting the boards centred, just do a rough check to make sure you won’t have a sliver of a board down one side if you start from one wall.
If it is a feature one option is to start dead centre with two boards back to back with a double tongue to join them. From there you lay the boards in both directions.

For the bathroom there should be a water stop angle installed at the door threshold, the waterproof membrane should be run up the inside of the angle.

[Craka]

Unless the hallway is a feature or the main entrance I would not be to concerned about getting the boards centred, just do a rough check to make sure you won’t have a sliver of a board down one side if you start from one wall.
If it is a feature one option is to start dead centre with two boards back to back with a double tongue to join them. From there you lay the boards in both directions.

For the bathroom there should be a water stop angle installed at the door threshold, the waterproof membrane should be run up the inside of the angle.

Nah its not a main feature just basically extended from the larger living area. Sorry what the hell is a double tongue join out of interest?

No door in what will be the bathroom yet. But do I have this right waterstop angle gets a fixed , waterproofed up inside of angle, than fit transition piece over the angle from higher timber floor to lower bathroom (microcement) finished floor height?

[droog]

If you have two floorboards back to back or groove to groove you cut an extra wide tongue that fits between them.
Normally you lay a board and then fit the next board to the tongue of the already laid board. Doing the above you start in the middle and lay outwards both directions.

Not sure what is the normal for different heights at the bathroom threshold, I have only ever finished them flush.
I would look at options to taper the last board to the water stop or grade the last section of the wet area up to the finished timber floor.

[Craka]

Thanks Droog,

Have ended up just laying from the perimeter wall for the hassle it would be to start in centre.

These are engineered boards so unfortunately cannot taper the edge so will need to use tapered trim of aluminium or other timber moulding.