PTAK Attack: Avoid mistakes with packaged terminal air conditioners that undermine wall systems

November 29, 2012
Publication: Buildings Magazine p 42-48
Author(s): Thomas Schwartz Mark Brown Octavian Vlagea

Building wall systems would work great, if it weren’t for all the holes we put in them. One of the leading examples of these holes is caused by the packaged terminal air conditioner (PTAC), most common in hotels and multifamily buildings. PTACs are permanently installed, through-the-wall units designed to cool or heat individual rooms. Design and construction methods involving PTACs vary, but all too often, they allow water leakage into the building. No matter what the causes of water may be, fundamental principles of wall waterproofing can be applied to PTAC installations to produce reliable and durable solutions.