Washington Revised Code Title 64. Real Property and Conveyances § 64.55.050. Scope of inspection--Definition

(a) Water penetration resistance testing of a representative sample of windows and window installations. Such tests shall be conducted according to industry standards. Where appropriate, tests shall be conducted with an induced air pressure difference across the window and window installation. Additional testing is not required if the same assembly has previously been tested in situ within the previous two years in the project under construction by the builder, by another member of the construction team such as an architect or engineer, or by an independent testing laboratory; and

(b) An independent periodic review of the building enclosure during the course of construction or rehabilitative construction to ascertain whether the multiunit residential building has been constructed, or the rehabilitative construction has been performed, in substantial compliance with the building enclosure design documents.