Current model building codes require attic ventilation in all U.S. climates. Originally, these requirements were strictly based on concerns for condensation in attics during winter in cold climates, and they were based on limited technical infor-mation. Nevertheless, attic ventilation has become the uncon-tested strategy to minimize condensation and ice dams during winter and extreme attic temperatures during summer However, other strategies exist that address each of these prob-lems as well as or better than attic ventilation. This paper examines issues such as summer attic temperatures, ice dams, and shingle durability and discusses the relative merits of attic ventilation compared to alternative design approaches in vari-ous climates. The authors support current recommendations for attic ventilation in cold and mixed climate but recommend that attic ventilation be treated as a design option in warm, humid climates. The authors review the new information on attic and roof ventilation in the 1997 ASHRAE HandbookˇŞ Fundamentals and discuss the reasons for the change s

• drying potential of building envelope : attics
• roof : attics ventilation

1. A mathematical model for indoor humidity in homes during winter
2. Accuracy of wood resistance sensors for measurement of humidity
3. Air pressures in wood frame walls
4. Effect of cavity ventilation on moisture in walls and roofs
5. Interior moisture design loads for residences
6. Manufactured housing walls that provide satisfactory moisture performance in all climates
7. Moisture management in buildings
8. Moisture transfer through materials and systems in buildings
9. Performance of back-primed and factory-finished hardboard lap siding in southern florida
10. Ventilation, humidity, and condensation in manufactured houses during winter
11. Weather Data  

1. Bugs, mold & rot II
2. Temperature and moisture performance of wall assemblies with fiberglass and cellulose insulation
3. The history of attic ventilation regulation and research