In this reading Ching discuses the muse of masonry envelope assemblies, He starts off with the discussion of how surface bonding consists of laying CMU’s dry without any mortar and plastering each of the sides with a bonding compound, once the structure (wall) is assembled rigid thermal insulation could be place inside of the wall cavity or in the CMU/interior face of the back Wythe to help maintain a layer of insulation and prevent the loss of heat/cold air inside the building. Ching also goes into the more detailed features of these envelopes such as the use of a water proof moisture barrier to keep moisture prom penetrating to the inside of the building as well as the use of drips to help water run of the window sill and drip off it instead of running off the building surface. Later, Ching starts to talk about the use of materials like stone, which is a natural durable weather resistant construction material that may be laid in mortar like clay and concrete masonry units to make both a load bearing wall and/or a non-bearing wall. This stone can be laid in different patterns such as Random rubble, Coursed rubble, Squared rubble etc. Windows are also mentioned in this chapter going into full detail of the element that make up the windows from the mullion all the way to the glass pane itself and each method of constructing a window to swing a certain way (fixed, casement, awning, hopper, sliding, double hung, jalousie, pivoting).The Allen and Iono book proceed to go into further detail of the main ways of masonry wall construction where there are things like ties that hold on to masonry walls and masonry cavity walls and load bearing masonry walls. This book also covers window construction, swing, components and doors and their components.