Pre-Engineered Metal Buildings: How the Frame Works and What to Check
How a pre-engineered metal building works: tapered rigid frames, purlins and girts, frame types, how it compares with conventional steel and what to check.
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Anchor Bolts: Types, Grades and How Columns Are Anchored to Concrete
Cast-in vs post-installed anchor bolts, ASTM F1554 grades 36, 55 and 105, how a steel column is set on its anchors, OSHA’s four-rod rule and common mistakes.
Rebar Sizes Chart: #3 to #18 Diameter, Area and Weight
Rebar size chart for #3 to #18 with diameter, area and weight, why #9 breaks the eighths rule, how the weights are derived and what the grades actually mean.
Steel Gauge Thickness Chart: What the Gauge Number Means
Steel gauge thickness chart from 7 to 28 gauge in inches and mm, why the numbers run backwards, and the one division that gives you every thickness in it.
Gusset Plates: What They Do and How They Fail
A gusset plate joins members at a truss node and is a structural member itself. What it carries, the five ways it can fail, and why it has to be designed.
Weld Symbols Explained: How to Read a Welding Symbol
How to read a welding symbol: arrow side versus other side, fillet and groove shapes, size, length and pitch, the all-around circle and the field weld flag.
Bolt Grades Explained: Grade 5, Grade 8 and Structural Bolts
Bolt grade chart with head markings and strengths, why Grade 8 is not simply better, and how structural A325 and A490 bolts differ from hardware grades.
Purlins Explained: C Purlin vs Z Purlin and What They Do
A purlin carries the roof sheeting to the frames. C vs Z sections, why Z purlins get lapped, how the roof braces them, and cold-formed vs hot-rolled steel.
Steel Decking Explained: Roof Deck, Form Deck and Composite Deck
Steel decking spans, forms the slab and acts as a diaphragm. Roof deck vs form deck vs composite deck, what B deck means, and why the gauge runs backwards.
Ridge Beam vs Ridge Board: Which One Holds the Roof Up?
A ridge board spaces rafters; a ridge beam holds them up. How rafter thrust works, why ties matter, and what changes when the ceiling joists come out.