A 1 inch air gap is needed behind brick veneer as required by the 2009 international residential code irc baechler et al.
Drainage plane behind vinyl siding.
Since you have tyvek you re all set.
Behind vinyl siding you definitely need a water resistant barrier wrb.
Rainscreen between flat to wall siding and the water resistive barrier as a best practice.
Which is like the top of the wall.
Walls that dry are walls that last for a long long time.
So why use a drainage mat product behind your stucco cultured stone man made stone thin brick hardboard siding or other veneer.
With vinyl and aluminum siding the drainage space is more pronounced and furring is not necessary.
Ideally wood siding should be installed over furring creating a drained and vented air space between the drainage plane and wood siding.
With wood siding the drainage space is typically intermittent and depends largely on the profile of the siding.
It makes its own drainage gap.
For single family construction james hardie recommends installing a 90 efficient drainage plane or a 3 8 inch air gap i e.
Below the window air can flow up and out behind a notch in the trim board.
Drainage planes building paper house wrap etc allow any moisture that does accumulate behind siding a chance to drain away harmlessly.
Above the window is the same deal water can drain out air can flow in.
Ideally wood siding should be installed over furring creating a drained and vented air space between the drainage plane and wood siding.
Siding is applied directly over the drainage mat so water can drain out and air can flow in.
The air space between siding and sheathing should also allow humid air to escape.
However none of these products does a great job at draining water out from behind the siding materials or allowing the back side of siding to dry out.
You don t need a separate air gap between the vinyl siding and the tyvek because vinyl siding is installed loosely and doesn t sit tight to the sheathing.
There are lots of products and methods on the market today for creating drainage planes.
Building america recommends a gap of at least 1 16 inch behind lap siding and a drainage space of inch between stucco and plastic house wraps to control liquid phase water penetration.