Construction Techniques

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PM3150 – Construction Techniques

Chapter 5 Questions, pg 219

3. What are the differences between balloon framing and platform framing? Platform: a) Studs in platform framing extend only from the top of one level of framing to the bottom of the next. b) In platform framing the studs and sole plates rest on the top of the floor platforms. Balloon: a) Studs in balloon framing extend unbroken from the foundation to the roof. b) Firestops are required in balloon framing to close the cavities in the wall against the passage of fire. c) Floor joists in balloon framing rest on a wood ribbon (also called ribband) recessed into the studs. d) Studs n balloon framing rest on the sill. What are the advantages and disadvantages of each? Platform: Advantages: Platform framing is much easier to erect. Size of lumber is standardized and easier to manufacture. Almost no additional fireblocking is required. The walls bear upon the platform rather than directly upon the walls of the story below. House can be one or three stories instead of just two. The platforms are convenient working surfaces for the carpenters who build the frame. Disadvantages: Platform frame settles considerably as the wood dries and shrinks. Balloon: Advantages: 40% cheaper than mortise and tenon frame. Two men could attain the same results in a day that required twenty men using the old-fashioned method. Disadvantages: Lumber lengths are much greater, needing to span from the foundation to the attic. Fireblocking has to be added between floors. Floors rest on ribbands around the perimeter of the structure. Why has platform framing become the method of choice? Balloon frame used full-length studs that ran continuously for two stories from foundation to roof. In time, it became apparent that these were too long to erect efficiently. Furthermore, the tall, hollow spaces between…...

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