Competency 206 00 Draw wall sections and details

Competency: 206. 00 Draw wall sections and details Objective: 206. 05 Determine the purpose and features of a wall section.

Sectional Drawings n Used to reveal the internal construction n Provide information concerning materials and assembly n Detail sections show specific parts of construction

Sectional Basics Cutting Planes n Edge of cutting plane is drawn as a line on the floor plan n Heavy, dark line n Coding includes two dashes n Arrows indicate direction of sight n Most often attached to a circle that identifies the section and its location within the drawing set

Sectional Basics Cutting Planes n Sometimes only the ends are shown to prevent interference with other information Assumed to be a straight line between ends n If offset, the bend (offset) is shown n A cutting plane extending fully across the short dimension of the structure defines a transverse section n A cutting plane extending fully across the long dimension of a structure defines a longitudinal section n

Sectional Basics n Section lining (hatching) n Features behind the cutting plane are not section, but are shown in proper position and scale n Materials are defined by symbols (section lines) n Hatching (section lining) is thinner than visible lines

Section hatching Common Symbols Brick Steel Insulation

Section hatching Common Symbols Concrete Lumber Earth Sand Gravel

Drawing Scale n Sections showing the entire building are drawn at small scales n ¼” = 1’-0” are most common n Small scales do not allow detail n Break lines are used to reduce distances by removing repetitive information Used where construction does not change over a long distance n Allows drawing large areas at readable scales n Long break lines have a center zigzag or looped connection n

Drawing Scale n Scale selected for a Typical Wall Section should allow the details to be clearly shown while still fitting the available space ¾” = 1’-0” 1 -½” = 1’-0”

Dimensions n Specific elevation numbers, distances, and sizes of building materials n Important dimensions are often included n Floor to ceiling heights n Crawl space vertical height n Footing sizes n Foundation wall thickness n Roof overhang n Roof slope

Dimensions n The order of notes is to give number, size, and material description of various building elements n Ex: 2 -2 x 4 DOUBLE TOP PLATE n Leaders lead from the note to where the note applies

Elements Shown on Typical Wall Section n Footing n Rafter or truss n Foundation n Fascia (if included) n Drain tile and waterproofing as n Soffit (if included) n n n n needed Sill and sill anchoring system Joists and Rim Joists Subfloor Underlayment Sole plate Wall stud Double top plate Wall sheathing material Ceiling joist or truss n Lookouts and other soffits n n n nailers Drip edge Building paper Roof covering material Insulation for walls, floors, ceilings Interior and exterior wall finish materials and trim Metal straps (hurricane ties)