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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 studs acted as multiple chimneys in a fire, spreading the blasé rapidly to the upper floors, unless they were closed off with wood or brick firestops at each floor line. Several modified version of the balloon frame were subsequently developed in an attempt to overcome these difficulties. The most recent of these, the platform frame, is now the universal standard.

4. Why is little added fire stopping required in platform framing? Because each platform is a complete solid surface in the horizontal plane with very few openings between stories, unlike balloon framing where the floors were build against the studs instead of on top of them.

5. Why is a steel beam or glue-laminated wood beam preferred to a solid wood beam at the foundation level? Steel and glulam are stronger than solid wood, shrink less (or not at all), and are straighter.

6. How is a platform frame building braced against wind and earthquake forces? Walls are sheathed with either plywood or OSB, which provide permanent, very stiff bracing, or with diagonal let-in bracing. Also walls are attached to the foundation or floor platform with metal hold-downs to prevent the walls from pulling up off the foundation or floor platform.

7. Light framing of wood is highly combustible. In what different ways does a typical building code take this fact into account? The building code severely reduces the size of building that can be build using light wood construction as compared to other types of less combustible construction.

Chapter 6 Questions, pg 253

3. Which types of siding require a nail-base sheathing? Wood shingles and shakes require a nail-based sheathing material. What are some nail-based sheathing materials? OSB or plywood. Name some sheathing materials that cannot function as nail bases. Insulated sheathing materials.

5. How does one make corners when siding a building with wood shingles? Two methods of making corners with wood shingles are weaving where the first walls shingle extends to cover the second walls shingle edge and then alternate this up the wall. The second method is to cover the corner with a corner board.

6. Specify two alternative exterior coating systems for a building clad in wood bevel siding. Aluminum and vinyl sidings are both intended to imitate wood horizontal bevel sidings.

7. What are the usual reasons for premature paint failure on a wood-sided house? No aspect of painting and finishing work is more important than surface preparation. Unless the substrate is clean, dry, smooth, and sound, no paint or clear coating will perform satisfactorily.

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