Tarp over wall tent

[Bhoesl]

For those of you who use a tarp over top of your wall tent, do you put the tarp directly over the canvas at the top, or do you rig up something along the ridge to maintain a gap between the tarp and the canvas?

 

[glass eye]

For those of you who use a tarp over top of your wall tent, do you put the tarp directly over the canvas at the top, or do you rig up something along the ridge to maintain a gap between the tarp and the canvas?

I don’t use a canvas tent but I do set up a tarp above my tent even though it has a rainfly.
A gap between the tarp and tent will keep it cooler in the heat and drier in the rain.