Conceptual Reference Database for Building Envelope Research Prev
Next

Understanding vapor barriers

Lstiburek, J. W.
2004
ASHRAE Journal, Aug2004, Vol. 46 Issue 8, p40, 8p


Lstiburek, J. W., (2004), "Understanding vapor barriers", ASHRAE Journal, Aug2004, Vol. 46 Issue 8, p40, 8p.
Abstract:
Explains the functions of vapor barriers in building designs. Importance of vapor barriers in preventing building assemblies from drying; Principle of control of water in the liquid form; Recommendations on the proper use of vapor barriers.

The boundary layer wind tunnel (BLWT), which reproduces the increase of wind speed and the propagation of mechanically induced turbulence upwards from the ground, owes its development and validation to measurements of surface pressures, building motions, and other wind effects on full-scale structures. Computational fluid dynamics models are now considered useful adjuncts for some tasks in wind engineering, thanks to encouraging comparisons with BLWT and full-scale results. More recently still, researchers are turning to elaborate computer models to study the transfer of heat, air, and moisture (HAM) through the building envelope. Full-scale experiments to validate HAM computer modelling will be more complex and costly than those for wind alone, but such benchmark data are essential if we are to have confidence in our predictions of the serviceability and durability of building envelopes in the real world.

This link has not been checked.URL (Concordia user only)


Related Resources:

This publication in whole or part may be found online at: This link was checked on Dec. 2006here.

Related Concepts


Author Information and Other Publications Notes
Lstiburek, J. W.
  1. Air pressure and building envelopes
  2. Blame It on Star Trek: Solving IAQ Problems
  3. Builder's guide: cold climates
  4. Moisture Control Handbook: new low-rise, residential construction
  5. Moisture control handbook: principles and practices for residential and small commercial buildings
  6. Performance evaluation of exterior insulation and finish systems (EIFS)
  7. Pressure response of buildings
  8. The fundamental flaw of EIFS
  9. Unventing attics in cold climates  



CRDBER, at CBS, BCEE, ENCS, Concordia,