The seismic reaction of un-bolstered masonry buildings as a result of in-aircraft stiffening in their one-layer timber flooring is numerically investigated by means of non-linear incremental dynamic analyses. Two independent situation reports of two-storey properties with timber floors stiffened with option strategies (addition of forty five° oriented timber boards, https://masonrytotimber30368.fitnell.com/61488457/the-definitive-guide-to-wall-ties