As such a patio falls under the irc recommendations on grading and drainage.
Hpatio how far belwo siding.
This allows the patio to be constructed 1 2 away from the sheathing giving an air gap that will allow moisture to drain and evaporate.
When it is higher from the ground splashing water onto the wood is minimized.
It protects the sheathing from rain snow and pests.
By installing the properly flashed deck at a level slightly below the home s flooring you can ensure that any water flows down and away from your primary structure.
That would vary with the installation but siding should pretty much never finish at the patio surface there should always be a gap and that will vary from 2 6 depending on the type of patio materials.
There s no magic number but i would recommend a minimum of 2 in.
The wood is not sitting in a moist or wet condition so it is not wicking moisture.
Aluminum or fiberglass groundbreaker flashing is placed just up under the bottom of the trimmed siding and extends below the last wood element on the home the sill plate.
Six inches would not be too far.
All hardscape within 10 feet of a building must slope away from the building with a minimum slope of 2 percent.
The bottom of the starter strip the part the bottom panel hooks on to should be at least 1 in.
Many doors have a sill or threshold that needs to be supported so don t forget to install a kick plate under the door.
The further the better.
Moisture could build up and leak its way into your indoor flooring or between and under the siding inviting bigger problems.
I opted for 3 1 2 in.
Below the top of the foundation but the lower the vinyl siding is installed the better.