Water drainage of patio

Jodiehx91

Hi, 

I recently had an Indian stone patio fitted however when we were washing it down after finishing of the rest of the garden it was noted that the water was running down towards the house. There had been a gap left between the house and patio which had been questioned and he was coming back to sort that as said wouldn’t of been able to point originally due to it been small. 

I know that Indian stone has to be level but should there be a slight slope for the water to drain into the garden away from the house? Or is this ok? Would it cause any damage to the house itself? 

Any feedback would be appreciated 

Slithery

Any decent groundworker would have made sure that the drainage was properly accounted for.

How far below your DPC does the patio meet the house?

Markneath

Which way does your garden slope?

Its not always possible to slope it away from the house.

AdrianC

Jodiehx91 said:

I recently had an Indian stone patio fitted however when we were washing it down after finishing of the rest of the garden it was noted that the water was running down towards the house. There had been a gap left between the house and patio which had been questioned and he was coming back to sort that as said wouldn’t of been able to point originally due to it been small. 

I know that Indian stone has to be level but should there be a slight slope for the water to drain into the garden away from the house? Or is this ok? Would it cause any damage to the house itself? 

Assuming that gap is either a french drain or below the DPC of the house, there should be no issue.

But we can't quite tell that from here.

Davesnave

There should always be a slight slope of about 1:40 if my memory's correct. Which way it goes depends on individual ground conditions and things like the ease with which a French or Acco type drain might be incorporated.

There should be a definite means of collecting/dispersing the water if the slope is towards the house and the finished surface shouldn't be less than 150mm below the DPC.

Jodiehx91

Slithery said:

Any decent groundworker would have made sure that the drainage was properly accounted for.

How far below your DPC does the patio meet the house?

This is where the patio is and the gap… like I say it drains down the gap. 

Jodiehx91

AdrianC said:

Jodiehx91 said:

I recently had an Indian stone patio fitted however when we were washing it down after finishing of the rest of the garden it was noted that the water was running down towards the house. There had been a gap left between the house and patio which had been questioned and he was coming back to sort that as said wouldn’t of been able to point originally due to it been small. 

I know that Indian stone has to be level but should there be a slight slope for the water to drain into the garden away from the house? Or is this ok? Would it cause any damage to the house itself? 

Assuming that gap is either a french drain or below the DPC of the house, there should be no issue.

But we can't quite tell that from here.

Hi. 

There is no French drain it literally is just a gap that he didn’t fill in but said he would come back. 

This is a picture of it. I’m just conscious that it is going towards the house. 

Jodiehx91

Markneath said:

Which way does your garden slope?

Its not always possible to slope it away from the house.

My garden sloped away from the house we have levelled the garden it’s set of with a gradient away from the house. 

Davesnave

You are all right for the level below DPC by the look of it, but there should have been a means of collecting and dispersing the rainwater that falls on the patio, not just an unpointed gap between house and slabs, if that's where the water runs to.

(edited)

Markneath

Jodiehx91 said:

Markneath said:

Which way does your garden slope?

Its not always possible to slope it away from the house.

My garden sloped away from the house we have levelled the garden it’s set of with a gradient away from the house. 

It doesn’t mean it can always be done, if the patio is well below the dpc and there’s somewhere for rain water to drain and not pool against the house then no real issue. 

Davesnave

Markneath said:

Jodiehx91 said:

Markneath said:

Which way does your garden slope?

Its not always possible to slope it away from the house.

My garden sloped away from the house we have levelled the garden it’s set of with a gradient away from the house. 

....if the patio is well below the dpc and there’s somewhere for rain water to drain and not pool against the house then no real issue. 

According to the OP: "it was noted that the water was running down towards the house."

Much depends on  exact circumstances. I have a place on my property where concrete has been laid much too close to the DPC, but I don't worry because it's in a sheltered place and there's a small slope away from the property into a flower bed. I don't think this situation here will necessarily give the OP any trouble if the water doesn't pool and moves away parallel to the building, but the job still isn't the best.