HC-Lecture08-Light-Wood-Frame-Houses

HC-Lecture08-Light-Wood-Frame-Houses - Heavy Construction...

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Heavy Construction Heavy Construction Lecture #08 Lecture #08 Light Wood Frame Construction L Prieto-Portar 2008
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Advantages of Light Wood Framing. 1) Flexible because it can take almost any shape, and easily accommodates the MPE (mechanical, plumbing and electrical) utilities as the HVAC; 2) Easily constructed with minimal use of tools and equipment; 3) Still economical, and can compete with “factory” housing; Disadvantages. 1) Wood burns rapidly; 2) Wood decays if exposed to moisture; 3)Wood changes volume with moisture changes; 4 A wood structural framing is unattractive and must be covered. History. Prior to mid-1800s, most houses were timber frame, or timber with masonry or stone. Lumber was plentiful and many craftsmen were available. By the late 1800’s, the light wood framing used nails and other metal connectors, which greatly simplified the skills needed to build houses. The earliest version of light wood framing was the “balloon framing” system.
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The Balloon Wood Framing System. The balloon system was the first standardized all light wood framing system developed in the US during the late 1880’s. It was quickly copied throughout the nation. It employed for full height studs, which meant that the studs were very long (from the ground to the roof). It was much cheaper than the traditional timber houses. The balloon method had the disadvantages that (1) the full length studs were difficult to handle, (2) the 2nd floor platform was hung from the studs, which could easily overstress the studs, and (3) the houses did not have a natural fire-stop.
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The Platform Wood Frame System. This system evolved fro the balloon frame, by eliminating its major disadvantages. It became increasingly popular during early 1900’s. The advantages of this new framing are, (1) the pieces are shorter and easy to handle, almost entirely made up of 2” thick lumber, (2) the framing generates an automatic fire-stop, (3) each level serves as a structurally stable working platform for the next level, and (4) the connections are nailed. On the other hand, this platform frame system has the disadvantage that it is more sensitive to vertical shrinkage.
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The Design Sequence for a Platform Framed House. 1)
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HC-Lecture08-Light-Wood-Frame-Houses - Heavy Construction...

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