Posted: Thu Jun 09, 2016 10:28 am
Hi
I live in an old terraced house with a long garden and a 4m x 2m area paved in blue bricks next to the house. This bricked area seems to be very old indeed - the bricks have settled so they're very uneven & difficult to walk on and at least 50% of them are damaged so the area needs something doing with it. It will be light pedestrian traffic (me & my wife) and the occasional wheelbarrow - nothing heavy duty.
My chosen solution is gravel in a Nidagravel 130 hexagon stabiliser.
The layer thicknesses will be as follows:
Sub-base: MOT Type 1 - 50mm
Sand - 10mm
Gravel (containing the Nidagravel stabiliser) - 45mm (10mm diameter angular gravel)
They recommend a membrane below the sub-base too, i assume to stabilise things and stop the sub-base & sub-grade mixing.
The stabiliser is 30mm thick so the 45mm gravel depth means that it will be filled with gravel + an extra 15mm or so to hide the hexagons, they recommend the 10mm thick sand layer on top of the MOT to prevent damage to the bottom of the stabiliser.
My question is simply do i need to take drainage & run-off into account??
If it was a less permiable patio of flag stones etc i'd need to slope it away from the house by a certain amount so that rainwater ran off towards the garden but would i need to do this with what i'm proposing or would any rainwater simply drain straight down through the layers to the soil below (particularly would it drain through the MOT)?
If i do need to allow a 'fall' how much would you suggest, 1:80??
Thanks in advance for your replies!
I live in an old terraced house with a long garden and a 4m x 2m area paved in blue bricks next to the house. This bricked area seems to be very old indeed - the bricks have settled so they're very uneven & difficult to walk on and at least 50% of them are damaged so the area needs something doing with it. It will be light pedestrian traffic (me & my wife) and the occasional wheelbarrow - nothing heavy duty.
My chosen solution is gravel in a Nidagravel 130 hexagon stabiliser.
The layer thicknesses will be as follows:
Sub-base: MOT Type 1 - 50mm
Sand - 10mm
Gravel (containing the Nidagravel stabiliser) - 45mm (10mm diameter angular gravel)
They recommend a membrane below the sub-base too, i assume to stabilise things and stop the sub-base & sub-grade mixing.
The stabiliser is 30mm thick so the 45mm gravel depth means that it will be filled with gravel + an extra 15mm or so to hide the hexagons, they recommend the 10mm thick sand layer on top of the MOT to prevent damage to the bottom of the stabiliser.
My question is simply do i need to take drainage & run-off into account??
If it was a less permiable patio of flag stones etc i'd need to slope it away from the house by a certain amount so that rainwater ran off towards the garden but would i need to do this with what i'm proposing or would any rainwater simply drain straight down through the layers to the soil below (particularly would it drain through the MOT)?
If i do need to allow a 'fall' how much would you suggest, 1:80??
Thanks in advance for your replies!