In early 2019, with funding support from Natural Resources Canada, the National Research Council Canada conducted a series of room scale fire tests of Encapsulated Mass Timber Construction (EMTC) with nail laminated timber (NLT) and Glulam structural elements. The goal of this test series is to quantify the contribution of NLT mass timber elements to compartment fires and to provide additional data as the technical basis for the amount of exposed mass timber elements to be allowed in EMTC buildings without significantly increasing the fire severity and duration.