External Doorways

[renovate1]

How did they prepair the brickwork/blockwork for doorways back in the 70's?

I have a house from that period and there appears to be a small hole in the floor just inside the doorway. Prodding down with a screwdriver seems to indicate it is very deep. This is directly below the skirting attached to the door brickwork return/reveal (not sure what it's called!)

Can anyone point me to an old drawing of a sectional view of what it may be like under and to the sides of the door threshold?

Eg. how does the floor screed 'bridge' the 'below DPC brick/blockwork?'

How would they have done it then?

I need to understand what I should do about this hole.

Thanks in advance.

 

[stuart45]

Back in the 70's some slates were often bedded across the cavity at the doors and the floor screed was taken over the top to the frame.