Concrete garage floor threshold advice required

[ruggers]

Looking to get my integral garage floor slab poured soon and would like opinions on two things.

 

1. The transition point between concrete floor slab and the tarmac drive.

 

2. Depth of floor slab at the back of the garage where the fire door to house is, and the entrance to outdoors end.

 

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1 - I was thinking of adding a row of 200 x 50mm pin kerbs between the reveals to either side of the house outer block course as the concrete tarmac divide. But which side will be better? The inside means less concrete is visible from outside.

 

Or if its outside at least the concrete finishes flush with the outside house brickwork & any kerbing i need to run around the facing stone meets the threshold kerbing neatly.

 

I'm more concerned that will the tarmac could eventually crack if its laid over type one and then 100mm of block. Bith should be solid, but?

 

2 - Garage is integral to the house. Block and beam sits 225mm below house FFL. Garage is 6.75m long.

Concrete with fibres in will be used.

 

If correct B regs says you have two choices. 

Either a minimum 100mm step down into the garage and then the floor can be level, or a continual slope to outside. I always thought it was both.

 

Surely a flat concrete floor would be easier to lay and float off than a small slope?