Copyright Goodheart-Willcox Co., Inc. Unit 12 Residential Framing Prints 209 worker should be familiar with the three types and be able to distinguish between them on drawings. Platform framing, also known as g g western framing,g g is the most widely used type. It gets its name from its appearance. The first floor is built on top of the foun- dation, so it resembles a platform when the subflooring is complete. The first-floor wall sections are raised and a second- floor platform is built on top of these walls. Then, the second-floor wall sections are raised and another platform for the second-story ceiling is constructed. See Figure 12-9. Each floor is a separate unit built on the structure below. Balloon framing is not used to any large extent today. g In this type of framing, the studs extend unbroken from the first floor sill plate to the top plate of the highest floor. Second-floor joists rest on a member called a ribbon, which is set into the studs, Figure 12-10. Balloon framing has some advantages: it reduces lumber shrinkage problems in masonry veneer and stucco structures it also simplifies running ducts and electrical conduit from floor to floor. sometimes they are dimensioned to their centerlines. Masonry interior walls are dimensioned to their faces, with the wall thickness also dimensioned. When studying the floor plans of buildings with two or more stories, note the adjoining stairs, chimneys, and loadbearing partition walls. In certain building styles, the floor is cantilevered out over the foundation wall. In these cases, special framing details are shown. See Figure 12-8. Houses that have second stories smaller than the first are called one-and-a- half story houses. These houses usually involve knee walls (short walls joined by a sloping ceiling) and dormers. Split-level houses have floor plans in which the levels are separated by a half-flight of stairs. Many variations are called for in framing of this type of structure, so the plans should be studied carefully. Wall Framing There are three basic types of light frame construction: platform, balloon, and post-and-beam. The construction 4" NOMINAL BRICK 1 2 " EXTERIOR WALL SHEATHING 3 1 2 " 2X4 STUD WALL 32'-4" TO WOOD FRAMING 1" AIR SPACE 28'-8" TO WOOD FRAMING Edge of foundation wall under stud wall Stud wall Exterior wall sheathing Stud wall behind brick veneer Goodheart-Willcox Publisher Figure 12-7. The dimensions shown in color are to the face of the stud wall.