The humidity and humidity of the indoor swimming pool not only damage the internal building materials, but also penetrate into the inner cavity of the swimming pool structure [between the inner and outer walls of the pool]. Without proper vapor blockers, moisture from the pool can migrate to these areas as it flows from the inner warm side of the pool air side. When the steam retarder is not installed or infiltrated after installation, the mold, decay, mildew, internal premature structural failure, decay and insulation degradation are some problems.
Building materials and buildings play an integral role in controlling humidity and moisture migration
Steam barriers are often overlooked during the design phase, forgotten, not installed or improperly installed. Green Board, Dryvit, various other "boards", foil insulation and other types of on-site spray polyurethane foam insulation are not considered moisture barriers and are generally not recommended. Few sound-absorbing ceilings can withstand the stratification of the humidity in the indoor pool. Falling ceilings are discouraged because they become water traps in swimming environments. Many of these materials have been used in the past and the results are very negative; they are not bulletproof when it comes to moisture damage. Therefore, it has an effective steam retarder, good insulation, negative pressure and a properly designed chamber dehumidification system; it can prevent moisture damage during the design/construction stage.
What materials constitute a vapor barrier?
Typically, a vapor barrier for an indoor swimming pool is a material that does not allow moisture to migrate into the structure through the surface area. They are usually 8, 10 or 12 mil thick plates. The effectiveness of barriers to preventing moisture migration is assessed by the "permeability grade". The higher the perm level, the less moisture penetrates the barrier into the pool room structure. When used in an indoor swimming pool, it is recommended that the barrier has a perm rating of 0.10 or lower.
If existing indoor swimming pools and vapor blockers cannot be installed under the surface of the finished product, other materials that can be considered as vapor retarders are waterproof coatings or other types of coatings or sealants [please consult a coatings professional or construction professional] . We also recommend that you review the ASHRAE Vapor Barrier Guide for more information.
Where is the steam barrier in the indoor pool?
The application of a vapor barrier is also critical to preventing moisture damage. The steam barriers of all swimming pools are installed in the walls and ceilings under the finished surface [or the warm side of the pool room]. We recommend 10-12 mil. Install a seamless vapor barrier by surrounding the entire pool room. The barrier overlaps and seals at the joint. After installation, avoid penetrating barriers [ie, top hat concealed lighting is not recommended; all lighting is surface mounted]. All penetrations of mechanical and electrical contractors must be sealed to airtight. It is recommended to seal [not just overlap] the wall vapor barrier to the ceiling vapor barrier.
Care must also be taken when installing insulation around the isolation cell, as poor insulation can directly lead to higher energy and operating costs. Please note that the gap in the insulation creates a "cold spot" that promotes moisture condensation. If no negative pressure is designed, moisture will migrate to the area outside the pool room. A well-designed indoor pool will ensure attention to three important aspects of moisture migration and humidity control.