The article merely points out IMPs alone may not be defined asa ‘rainscreen system'(as defined by American ArchitecturalManufacturers Association [AAMA]508,Voluntary Test Methodand Specification for Pressure Equalized Rain Screen WallCladding Systems,or AAMA509,Voluntary Test andClassification Method for Drained and Back Ventilated RainScreen Wall Cladding Systems).The article does not disqualifyIMPs can be,and are used,as a backer or the cladding layer.Greatemphasis is exerted on the fact that multiple layers are neededfor a true rainscreen system.Below are some scholarly articlesthat define and measure rainscreen systems as published byvarious academic and professional institutions:

●  the National Research Council Canada's(NRC's)studies and subsequent recommendations to designers and professionals inthe building and construction industry proposed a formalizedcladding system that would not substantially increase neitherthe cost nor complexities of the construction process.Further,Kirby Garden's 1963 article in NRC's Division of BuildingResearch's Canadian Building Digest,“Rain Penetration andIts Control,"laid out the concepts,methods,and materialsinvolved in the new form of cladding arrangement,andpopularized the term “open rainscreen”and the overarchingrainscreen principle;
●  Empirical validation and modeling of a naturally ventilated rainscreen facade building,”citation data Energy and Buildings,ISSN:0378-7788,Vol:43,Issue:4,Page:853-863,publicationyear 2011;