In this section, Ching covers the important aspects of “Moisture & Thermal Protection” and even more.
The slope of a roof effects the building during the bad weather conditions, such as rain and snow or etc. The more flat roof top you have the more work needs to be done. For example Ching points out the importance of keeping cautious of waterproof membrane to contain the water while it drains or evaporates. But the higher the pitch of the roof is the more it supports its self by over lapping or interlocking tiles or whatever material you want to use. Its more on an angle, its easier for it to shed the water. Ching also covers the concept of “Flashing”. Flashing is a thin continuous sheet or other impervious material installed to prevent the passage of water into a structure from an angle or joint. It protects the joints from the water that penetrate it. Its up to you if you want to expose it or conceal it. It has to be a water proof material.