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.

 

-------------

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?

 

 

[BotusBuild]

On our old house the tarmac drive went tight up to the concrete garage floor, just a little lower, I guess to minimise water being driven into the garage. The drive sloped away from the garage.

 

Just poured our garage slab/floor and I went for level, but didn't achieve it. I need to self level a portion to stop liquid collecting at the back of the garage.

 

I guess that is DPC showing? In which case any concrete should end up below that anyway.

What is the channel?

 

Sounds like you may need a step at the fire door.

[ruggers]

How much concrete is visible outside when the garage door is down?

 

My garage door will be a sectional door that sits behind the reveals.

 

My whole ground floor is beam and block at the same level, but the house will be 175 insulation and 50mm screed. The step down into the garage would be 225mm - the thickness of the garage floor concrete slab. So if its 125mm at the back of the garage, then there's 100mm minimum step down.

 

A.I suggests 100 is the minimum step down for a flat floor, or the floor needs to slope outwards. My approved plans seriously lack detail which is poor.

 

My drive slopes away from the garage door but there's not much in it. About 70mm over 17m.

 

The channel is the cavity wall, ill probably fill it with the end of the slab so theres a good strength at the end.