Laying a patio flush with inside floor level. Dpc concerns?

tom1ie

Hi all
A quick outline:
I'm thinking of laying a stone patio that will be flush with the inside height of the floor level. This is so in the future I will be replacing a window with French doors so there will be no change in floor level from the wooden floor in the living room to the patio area in the back garden, the patio will be sloped away from the house for water run off.
My concern is the dpc.
Do I have to run dpc up the wall "vertically" (stuck to the back garden wall) or what way do I do it?
Should I have a linear drain running the full width of the patio between the patio and the back house wall?
I'm not sure how to attach a drawing, but the back garden slopes towards the house (high point of garden is away from house low point is next to house) towards a 10" retaining wall, then there is a concrete path about 2.5m wide then the back wall of the house.
Thanks for the help, and if I've posted this in the wrong area, mods feel free to move it.

homer911

Not an expert but I'd say yes to the linear/French drain. I'd also add one at the edge of the 2.5m wall. If you have no drain to connect to, dig a sump hole and fill with hard core - you will need somewhere for the run-off from the garden and the French drain to run into

tom1ie

homer911 wrote: »

Not an expert but I'd say yes to the linear/French drain. I'd also add one at the edge of the 2.5m wall. If you have no drain to connect to, dig a sump hole and fill with hard core - you will need somewhere for the run-off from the garden and the French drain to run into

The patio will extend out past the 2.5 metres. So the small retaining wall will b taken out of it and i was planning on using the grass/soil on the garden side of the retaining wall as infill, before putting a layer of stone on top of the soil I've just used as infill,to build up my level.
I'm wondering if I put in the linear drain between the back wall and the new patio, will I have to Put in some sort of membrane (dpc?) to stop damp transfer. Do I stick the drain to the wall using mortar? Tec7? Concrete?
I do plan on using another linear drain at the end of the patio. ( the garden end of the patio).
Thanks for the reply.

tom1ie

Bump

Calahonda52

tom1ie wrote: »

Bump

Bank holiday weekend!
Aggressive bump

Bullocks

Why do you have to rise up the patio to the inside floor height ? Could you not leave it lower and put in a step when you change to a door (or put in the step now if you know your sizes )
You can bed in the linear drains in mortar , just keep it down out of the way of the patio slabs .
I wouldnt use grass or soil to build up the height under the patio , take it away and use gravel or 804 depending how much you need to fill

tom1ie

Calahonda52 wrote: »

Bank holiday weekend!
Aggressive bump

Lol! Sorry.

tom1ie

Bullocks wrote: »

Why do you have to rise up the patio to the inside floor height ? Could you not leave it lower and put in a step when you change to a door (or put in the step now if you know your sizes )
You can bed in the linear drains in mortar , just keep it down out of the way of the patio slabs .
I wouldnt use grass or soil to build up the height under the patio , take it away and use gravel or 804 depending how much you need to fill

The overall plan is to put in bi fold doors that when open means you won't have to negotiate a step to go from living room floor level to outside patio level. I know putting in a step would be easier but the level floor looks so much better and i have seen it done before, for example wheelchair accessibility.

hesker

Should find your answer here

http://www.pavingexpert.com/threshold01.htm

Scroll down to the section on Doorway Drainage

You should be aware of dealing with splashback as discussed here

http://www.pavingexpert.com/dpc01.htm