Fundamentals of Building Construction
6th Edition
ISBN: 9781118138915
Author: Edward Allen
Publisher: WILEY
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Question
Chapter 16, Problem 1RQ
To determine
Write the major differences of low–slope roof and steep roof, and merits and demerits of each roof type.
Expert Solution & Answer
Explanation of Solution
Major differences:
Low–slope roof has the slope value less than 3:12 or 25 %. This roof type is made up of the deck which supports the roof, a vapor retarder, thermal insulation, the roof membrane, flashings and drainage components.
A steep slope roof has the pitch of 25 % or more. Three forms of roof coverings are provided for steep roofs such as thatch, shingles, and architectural sheet metal.
Write the advantages and disadvantages of the low-slope roof and steep roof as follows:
Advantages | Disadvantages |
Low–slope roof | |
Construction cost is less and has a simple geometry. | The membrane used in this roof should be water tight. |
Sometimes, these roofs serve as decks, balcony, and landscaped gardens. | Small careless performances are not considered as a serious issues and this might lead to the drastic quality issue. |
It can cover any horizontal dimension building. | Even small construction or design error can leads them to trap standing water puddles |
Steep roof | |
Inexpensive materials are used and they are easy to handle and install. | This roof structures are geometrically more complicated. These roofs are constructed to drain quickly providing gravity and wind to push or pull water through the thatch material. |
Small damages can be repaired easily. | It requires more materials compared to slope roofs of the same span. |
The water vapor vents easily in this roof system. | It cannot shelter any horizontal dimension building, as it is uneconomically high on a broad building. |
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Chapter 16 Solutions
Fundamentals of Building Construction
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