Editing Masonry (section)

==Passive fire protection (PFP)==
{{see|Passive fire protection}}
Masonry walls have an [[endothermic]] effect of its [[hydrate]]s, as in chemically bound [[water]], unbound moisture from the concrete block, and the poured concrete if the hollow cores inside the blocks are filled. Masonry can withstand temperatures up to {{convert|1000|F|C}} and it can withstand direct exposure to fire for up to 4 hours.{{citation needed|date=January 2020}} In addition to that, concrete masonry keeps fires contained to their room of origin 93% of the time.{{citation needed|date=January 2020}} For those reasons, concrete and masonry units hold the highest flame spread index classification, Class A.<ref name="AD">{{cite book |author1=Allen, Edward |author2=Rand, Patrick |title=Architectural Detailing: Function, Constructibility, Aesthetics |date=2016 |publisher=Wiley |location=Hoboken, NJ |isbn=978-1118881996 |page=137 |edition=3rd |url=https://books.google.com/books?id=HBYWCgAAQBAJ |access-date=18 October 2022 |archive-date=1 January 2024 |archive-url=https://web.archive.org/web/20240101152932/https://books.google.com/books?id=HBYWCgAAQBAJ |url-status=live }}</ref>

[[Fire cut]]s can be used to increase safety and reduce fire damage to masonry buildings.