From Chapter 4 Residential Energy Efficiency

N1102.4.1

Building Thermal Envelope

The building thermal envelope shall be durably sealed to limit infiltration.  The sealing methods between dissimilar materials shall allow for differential expansion and contraction.  The following shall be caulked, gasketed, weatherstripped or otherwise sealed with an air barrier material, suitable film or solid material.

1. All joints, seams and penetrations.
2. Site-built windows, doors and skylights.
3. Openings between windows and door assemblies and their respective jambs and framing.
4. Utility penetrations.
5. Dropped ceilings or chases adjacent to the thermal envelope.
6. Knee Walls.
7. Walls and ceilings separating a garage from conditioned spaces.
8. Behind tubs and showers on exterior walls.
9. Common walls between dwelling units.
10. Other sources of infiltration.

Making sense of codes for Stucco veneers over wood sheathing and Stick on Stone over wood sheathing

The current IRC2006 code for building paper below Pennsylvania & New Jersey

2006 IRC Code

Exterior Covering Section 703.

Exterior Plaster section Section 703.6

  703.6.3 Water Resistant Barriers.  Water- resistant barriers shall be installed as required in section R703.2 and where applied over wood based sheathing, shall include a water resistive vapor-permeable barrier with a performance at least equivalent to two layers of Grade D paper

Exception:  Where the water resistive barrier that is applied over wood based sheathing has a water resistance equal to or greater than that of 60 minute Grade D paper and is separated from the stucco by an intervening, substantially non watering-absorbing layer or designed drainage space.