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Presentation on theme: "TACTICAL DIAGRAMMING Why it works"— Presentation transcript:


2 Three components of Tactical Diagramming
Science Planning and building codes Terrain Analysis Skill Building practices and tactical diagramming practice Art Personal intuition, imagination and ingenuity A technique—not a tactic! Procedures for performing specific tasks or functions

3 Building Officials and Code Administrators Southern Building Code
Building Codes Three "national" building codes Originally instituted for fire prevention and escape Model codes rather than regulatory but usually adopted locally as requirements Local zoning ordinances Building Officials and Code Administrators Uniform Building Code Southern Building Code

4 Building Codes National Building Code of Canada
Adopted in 1941 Originally instituted for fire prevention and escape Model code rather than regulatory but usually adopted locally as requirements Local zoning ordinances

5 Reverse Engineering Mentally disassembling a house to visualize the interior Knowledge of building code requirements helpful but not essential Familiarization with building practices is largely already available Personal experiences and observations Especially useful for police and military All buildings are built for a purpose and many are altered to suit particular uses

6 Building Practices Driven by economic and aesthetic factors
Size and shape of house and organization of rooms Expense of installation and cost of materials Cultural conventions Enables mass produced goods and components Examples include window coverings, hardware, cabinets, furniture, plumbing fixtures, and so forth Some have been incorporated into local ordinances Just as influential as regulations Tend to be universal rather than regional Curtains at 80” for standardization Hot water is always on the left as a convention Stairways use a 7-11 rule, 7” rise to 11” tread ratio for comfortable ascending

7 Building Principles Four elements that must be controlled
Fire, Wind, Water, Gravity Use of building will strongly influence construction Buildings are hollow Limitations on span by materials and expense Nearly all residences in America are "stick framing" Interior walls are used for intermediate support Bearing walls are more predictable than partitions

8 Coup d'oiel French—"The vision behind the eye"
English translation—perceptive insight An ability to "see" on the other side of the hill or inside a house Part art and part science

9 Helpful Hints Work from large to small
Start with orientation Next go to building outline Diagram floor plan last Work from confidence to ambiguity Sketch in as many features that can be reliably placed and sized first Compare What you know or believe to what you see Be suspicious—explain incongruities Don't be afraid of "I don't know!"

10 Residential Trivia Size of house ~2,450 square feet (median)
Typical three-bedroom in Southwest USA is about 1,400 sq. ft. 80% built since 1920 About 2/3 will have an attached garage or carport Almost half will have a separate dining room More than 2/3 are occupied by the owner More than 3/4 are single-family structures Approximately 90 million homes in USA Each has more in common with the others than differences

11 Frequently Asked Questions
Why focus on residences? Most common target for warrants Public buildings provide far easier access to gain info How long does it take? Varies with amount of desired detail and complexity of building Generally, figure minutes for most applications How accurate can a diagram be? Depending on resource photos, as close as six inches for a room and a foot for a building Features can be precise! Many features, like doors and windows, can be estimated within one inch

12 Useful Tools ¼ʺ graph paper Mechanical pencil with HB lead
Good scale for nearly all diagrams Mechanical pencil with HB lead Soft lead with dark lines but easily erased Compass or dividers Easy and accurate transfers of scale Gum eraser, especially pen style Computer software By far, the easiest and simplest method for diagramming Some are automatically defaulted for sizes and codes Provide instant 3D versions, including walk-throughs Sketchup—free version from Google Chief Architect—Better Homes and Gardens Punch Pro—Punch Software, less than $100 Also useful is a magnifying glass for examining photos and/or an LCD projectile or computer for examining digital photos close up

13 Useful Books Look for illustrations as well as narrative
Comprehensive overview is better than detailed information You don’t need to read them, you’ll use them for reference and precision

14 Tactical Diagramming Book
Used as text for this course Written from a tactical perspective rather than a builder’s Heavily illustrated with examples, graphics, photographs, etc. Focused entirely on tactical diagramming

15 Questions?

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