The design of building enclosures to control rain penetration and control rain shedding is typically based on experience and rules of thumb that make use of traditional details. Unlike heat flow, vapour diffusion, exfiltration, etc. there is no rain control theory to aid the designer or analyst of building enclosures. Theoretical and empirical means of predicting the amount of driving deposited on a vertical above-grade building enclosure have been partially developed elsewhere (Straube, 1998). The objective of this paper the development of a rational and rigorous means of describing, understanding, and classifying rain control for the above-grade enclosure. Such description and classification are needed because they will: ? aid designers in understanding the function of each material and layer in an assembly. Such understanding will result in better enclosure designs that more reliably and economically meet a project's performance requirements; ? allow water penetration tests to be developed and applied that impose realistic loads and that more closely match likely service conditions. The results of such testing can also be more accurately interpreted to aid the prediction of actual performance under extreme and typical weather conditions; and ? provide a means for the accurate assessment of the reasons for enclosure failures and therefore enhance proper repair and retrofit strategies. The discussion initially focuses on what happens to rainwater deposited on an external wall surface.

• rain
• rain penetration, water intrusion
• surveys, reviews, statistics : rain control and design strategie

1. Drainage, ventilation drying and enclosure performance
2. Driving rain and building facades
3. Field testing of filled-cavity wall systems
4. Indoor air quality, healthy buildings, and breathing walls
5. Methodology and design of field experiments for monitoring the hygrothermal performance of wood frame enclosures
6. Moisture control in enclosure wall systems
7. Moisture fundamentals and mould
8. Moisture in buildings
9. Moisture movement in building enclosure wall systems
10. Overview of hygrothermal (HAM) analysis methods
11. Pressure moderation and rain penetration control
12. Rain control and screened wall systems
13. Simplified prediction of driving rain deposition
14. The influence of low-permeance vapor barriers on roof and wall performance
15. The role of hygrothermal modeling in practical building design: case studies
16. Vents, ventilation drying, and pressure moderation  

1. Development of design strategies for rainscreen sheathing membrane performance in wood frame walls
2. Drainage, ventilation drying and enclosure performance
3. Driving rain and building facades
4. Field testing of filled-cavity wall systems
5. Moisture movement in building enclosure wall systems
6. Overview of hygrothermal (HAM) analysis methods
7. Rain control and screened wall systems
8. Simplified prediction of driving rain deposition
9. The Ontario wall drying project
10. Uncertainty analysis for vapor pressure measurement
11. Ventilation drying in enclosure wall systems
12. Vents, ventilation drying, and pressure moderation