With Hurricane Michael having just left the Florida Panhandle a wet mess — pummeling the built environment and everything in its path with wind and rain — it seems timely to mention a valuable e-book that Construction Specifier has published on water intrusion. The primer — Protecting Against Water Intrusion— is part of the publication’s “Best of Series” and features four sections. The first outlines the seven “Ps” for successful rainscreen design and execution. Those “Ps” would be: product selection; penetration in the air vapor barrier; perimeters; parapets; pre-installation preparation and testing; positive drainage and of course… performance. In the next section — “Put Penetrations to the Test” – two architects discuss the effect of cladding attachments on air and water barriers. They note that building enclosure design involves balancing the demands of air and water protection with the thermal requirements. They conclude that available guidelines for detailing and testing the installed AWB with the cladding attachments can be scarce, and installation practices are not consistent from project to project. They argue for a need to develop installation methods that will provide durable and resilient solutions, as well as consensus on test standards to validate the air and water tightness. The third section — “There’s More Than One Way to Skin a Building” — offers practical considerations for combining face-and concealed-barrier walls. It presents design concepts for incorporating face-barrier elements into primarily concealed air and water barrier systems, as well as noting some of the construction challenges characteristic of these combination façade systems. The title of the final white paper — “The Perils of Moisture” – echoes a truism that comes as no surprise to professionals in the built environment: moisture intrusion can be nasty and costly. The piece provides a thorough overview of how air barriers can prevent moisture intrusion. Authored by Karine Galla, a product manager at Sto Corp. who has over 16 years of experience in the EIFS, stucco and AMB business, the article advocates for an impermeable air barrier system, applied continuously throughout the exterior of a building structure.