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Metal Building Glossary

This Sevier Metal Buildings glossary is built to help buyers, builders, and business owners better understand metal building terminology, including parts, framing systems, panels, trim, openings, insulation, ASCE loading language, and common drawing terms used in estimating, engineering, detailing, and erection.

Why This Glossary Matters

Understanding metal building terminology helps you compare quotes more accurately, review plans with more confidence, and avoid costly mistakes before you order a building package.

Components & Parts ASCE & Load Terms Drawing Terms

How to Use This Glossary

Use the search box or A–Z navigation to find specific terms, then use those definitions to better understand design criteria, framing details, openings, panels, and code-related requirements.

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What this glossary covers

Primary framing, secondary framing, roof and wall panels, trim, clips, closures, fasteners, insulation, openings, foundations, ASCE and code terminology, permit and shop drawing terms, and common parts used in metal building systems.

A Terms

Anchor Bolts

Steel bolts embedded in concrete that secure columns, base plates, or other steel members to the foundation system.

Anchor Bolt Plan

A drawing showing anchor bolt locations, projection, spacing, and layout so the foundation is placed correctly before steel arrives.

ASCE 7

The loading standard commonly used to determine wind, snow, rain, seismic, and related environmental design criteria.

Auxiliary Framing

Additional framing added to support openings, canopies, special loads, or other conditions not handled by the standard layout alone.

B Terms

Backer Rod

A compressible filler placed behind sealant joints to help control sealant depth and improve joint performance.

Base Angle

A steel angle at the bottom of a wall used to support or terminate wall panels at the slab or foundation line.

Base Plate

A steel plate attached to the bottom of a column that transfers structural loads into the foundation through anchor bolts.

Bay Spacing

The distance between primary frame lines along the building length, often affecting steel sizing, panel layout, and purlin design.

Bill of Material

A detailed list of parts, quantities, and components required to fabricate and supply the project.

Brace Rod

A steel rod used in roof or wall bracing systems to help stabilize the building against lateral forces.

Bracing

A system of rods, angles, cables, or structural members used to stabilize the building and resist lateral or out-of-plane forces.

C Terms

Canopy

A roofed projection extending from the building for covered entrances, loading areas, or drive-through use.

Clip

A connection piece used to fasten roof panels, wall panels, framing, or accessories depending on the system detail.

Closure Strip

A profiled material placed at panel voids to help block water, insects, air, and debris beneath trim or panel ends.

Cold-Formed Steel

Light-gauge steel shaped at room temperature into structural members for lighter steel framing systems and certain building packages.

Collateral Load

Additional permanent weight from suspended items such as lights, sprinkler lines, ductwork, and mechanical equipment.

Column

A vertical primary structural member that carries roof and frame loads into the foundation system.

Components and Cladding

A wind design category for localized pressures acting on individual parts such as panels, doors, trim, and fasteners.

Connection Detail

A drawing or engineering detail showing how steel members, clips, bolts, or welds are intended to be joined.

Corner Trim

Trim used at building corners to finish panel edges and improve weather protection at the exterior corner condition.

D Terms

Dead Load

The permanent weight of the building itself, including steel, panels, trim, insulation, and permanently attached items.

Deflection

The amount a framing member bends or moves under load, measured against allowable design criteria.

Design Loads

The combined structural loads a building is designed to resist, such as wind, snow, seismic, dead, live, and collateral loads.

Detail Callout

A drawing reference marker directing the reader to a larger or more specific construction detail elsewhere in the set.

Downspout

A vertical drainage component that carries rainwater from the gutter down to grade or a drainage system.

Drift Load

An increased snow load created where wind causes snow to pile unevenly on certain roof areas.

Drip Edge

A trim or flashing edge detail that helps direct runoff away from the wall or fascia line.

E Terms

Eave

The line or edge where the roof meets the sidewall of the building.

Eave Height

The vertical distance from finished floor to the point where the roof line meets the sidewall framing.

Eave Strut

A member at the eave that supports panel edges and helps tie the roof and wall systems together.

Endwall

The wall at either end of the building, typically beneath the gable or end roof condition.

Enclosure Classification

A code and ASCE concept that identifies whether a building is enclosed, partially enclosed, or open for wind design purposes.

Erection Drawings

Jobsite drawings showing component locations and assembly guidance for installing the building system in the field.

Expansion Joint

A separation detail designed to allow controlled movement between building sections due to thermal or structural effects.

Exposure Category

The wind terrain classification used in code design based on surrounding site roughness and openness.

F Terms

Fabrication

The process of cutting, drilling, welding, and preparing steel components for shipment to the jobsite.

Fascia

A trim or edge condition at the roof perimeter that helps finish the roofline and can conceal framing or gutter elements.

Fastener

A screw, bolt, clip, or similar connector used to secure metal building components together.

Field Verification

The process of confirming actual site conditions or dimensions before fabrication, erection, or follow-up work proceeds.

Flange

The wider flat portion of a beam or column that works with the web to resist bending forces.

Flange Brace

A bracing component used to stabilize a compression flange and reduce the risk of member buckling.

Flashing

Formed metal pieces used to shed water and finish transitions at roof, wall, opening, and trim conditions.

Framed Opening

A reinforced opening designed to support doors, windows, louvers, or other penetrations in the wall or roof.

Framing Plan

A drawing showing the arrangement of structural framing members by roof, wall, or floor level.

G Terms

Gable

The triangular upper section of an endwall formed by the slope of the roof.

Galvalume

A metallic coating using aluminum and zinc that helps improve corrosion resistance on steel sheet products.

Gauge

A thickness designation commonly used for panels and light-gauge members, though exact thickness varies by product category.

Girt

A horizontal secondary wall framing member that spans between columns and supports wall panels.

Ground Snow Load

The snow load value assigned to the site before roof-shape and code modification factors are applied.

Gutter

A roof-edge drainage component that collects and channels rainwater toward downspouts.

H Terms

Haunch

A reinforced portion of a rigid frame near the eave area where bending stresses are often highest.

Head Trim

Trim placed above an opening to finish the transition and help direct water away from the penetration.

High Strength Bolts

Structural bolts designed to resist significant tension and shear forces in major steel connections.

Hip Roof

A roof shape where all sides slope downward rather than ending in a vertical gable wall.

Hot-Rolled Steel

Steel formed at high temperature into structural shapes such as wide flange beams, channels, and angles.

I Terms

IBC

The International Building Code provides broad construction requirements that jurisdictions often adopt and amend locally.

Importance Factor

A code-based design consideration tied to the building’s risk category and intended importance.

Insulation System

A roof or wall assembly used to improve thermal performance, reduce condensation risk, and support interior comfort.

Internal Pressure Coefficient

A wind design factor used in code calculations to account for pressure changes inside the building envelope.

Interior Liner Panel

An interior-facing panel used for a cleaner finish, added protection, or to help conceal insulation and framing.

J Terms

Jamb

The vertical side member of a framed opening for a door, window, louver, or similar penetration.

Jamb Trim

Trim used along the side edges of an opening to finish the panel transition and improve weather protection.

Joist

A horizontal framing member that supports roof or floor loads and transfers them into the surrounding structure.

Joint Sealant

A flexible material used to seal joints and gaps against water, air, and debris intrusion.

K Terms

Kick-Out Flashing

A flashing detail that helps direct water away from wall intersections instead of allowing runoff behind the cladding.

Knee Brace

A diagonal brace between a column and roof framing used to improve stiffness and frame stability.

K-Section Joist

A common open-web steel joist series used in many lighter roof framing applications.

L Terms

Lean-To

An attached extension with a single-slope roof running off the side of the main building.

Live Load

Loads that can change over time, such as workers, maintenance activity, movable materials, or service loads.

Liner Panel

An interior-facing panel used for a finished interior surface or to help cover insulation and framing.

Load Combination

A code-required method of combining different loads to determine which structural design case governs.

Louver

A vented opening component that allows airflow while helping reduce rain and debris entry.

M Terms

Mezzanine

An intermediate floor level inside the building used to create additional usable space above the main floor.

Moment Connection

A structural connection designed to resist rotation and bending so the joined members act as a rigid system.

Monoslope Roof

A roof design that slopes in one direction rather than forming two opposing roof planes.

MWFRS

Short for Main Wind Force Resisting System, the overall structural system that resists wind forces on the building as a whole.

Mastic

A sealant or adhesive-type material used in certain panel lap, flashing, or waterproofing conditions.

N Terms

Nominal Thickness

A stated product thickness used for classification that may not exactly match measured finished thickness.

Non-Load-Bearing Wall

A wall that does not support the primary frame but still carries its own weight and wall cladding loads.

Nesting

A packaging or stacking method where certain parts fit within others to improve shipment efficiency.

O Terms

Occupancy Classification

The code-defined use category for a building, affecting certain load, fire, and life-safety requirements.

Open-Web Steel Joist

A joist with top and bottom chords connected by a web system, commonly used in roof and floor framing.

Overhang

The portion of the roof that extends beyond the wall line to provide shade or weather protection.

Overhead Door

A large door system that opens vertically and is commonly used for shops, warehouses, garages, and service bays.

P Terms

Panel Clip

A fastening component used in certain concealed-fastener roof or wall systems.

Panel Lap

The overlap between adjacent panels that helps create alignment and weather resistance.

PEMB

Short for pre-engineered metal building, a system engineered around the project’s dimensions, loads, and intended use.

Perimeter Angle

A trim or support angle used around slab edges, openings, liners, or panel transitions depending on the detail.

Permit Drawings

A drawing set prepared for permit review, typically showing enough information for code evaluation and jurisdictional approval.

Purlin

A horizontal secondary roof framing member spanning between primary frames to support the roof panels.

Purlin Brace

A bracing piece used to help stabilize purlins and improve their performance under load.

Pitch

A way of describing roof slope, often stated as rise over a given horizontal run.

Q Terms

Quantity Takeoff

A count or measurement of materials used for estimating, purchasing, or project planning.

Quality Control

The inspection process used to verify that materials and workmanship meet the intended requirements and specifications.

R Terms

Rafter

A primary roof framing member that works with the columns to form the main structural frame of the building.

Rake Angle

A member or trim-related angle used near the sloping roof edge at the endwall rake condition.

Rake Trim

Trim used along the sloping roof edge at the endwall to finish the panel edge and help protect the transition.

Ridge

The highest horizontal line on a gable roof where the two roof slopes meet.

Ridge Cap

Trim placed over the roof ridge to finish the joint and help protect against water intrusion.

Rigid Frame

A structural frame formed by columns and rafters connected to resist bending and lateral loads.

Risk Category

A code classification tied to building use and importance that affects certain design requirements and factors.

Roof Snow Load

The design snow load used for the roof after applying code-required factors to the ground snow load.

Roof Panel

A metal cladding panel used on the roof to create the exterior weather surface of the building envelope.

Revision Cloud

A drawing mark used to highlight a changed area between one drawing revision and another.

S Terms

Sag Rod

A rod used between purlins or girts to help align members and improve their stability under load.

Sealant

A flexible material used at joints, laps, trim, and penetrations to help resist air and water intrusion.

Section Cut

A drawing reference showing where a building or detail is cut through to reveal internal framing or construction relationships.

Section View

A drawing view showing a sliced-through portion of the building to explain how parts fit together vertically or through depth.

Seismic Design Category

A code classification used to determine the level of seismic design requirements applicable to the building.

Seismic Load

Structural forces resulting from earthquake motion that must be considered where seismic design applies.

Sheeting

A general term sometimes used for roof or wall metal panels forming the exterior skin of the building.

Shop Drawings

Detailed drawings used for fabrication and coordination that show part sizes, dimensions, assemblies, and installation relationships.

Sidewall

The long wall of the building running parallel with the ridge line.

Site Class

A soil classification used in seismic design to evaluate how ground conditions may influence earthquake effects.

Skylight

A roof opening or daylighting component used to bring natural light into the building interior.

Snow Load

The design load created by snow accumulation on the structure or roof system.

Standing Seam Roof

A concealed-fastener roof system designed for weather resistance and controlled thermal movement.

Stamped Drawings

Drawings bearing the seal of a licensed design professional when required by the authority having jurisdiction.

Stiffener

A reinforcing plate or shaped piece added to strengthen a connection, member, or localized stress area.

Secondary Framing

Members such as purlins, girts, eave struts, and related supports that carry panel loads to the primary frame.

T Terms

Thermal Movement

The expansion and contraction of metal caused by temperature change, which must be considered in panel and roof system design.

Trim

Formed metal pieces used to finish edges, corners, openings, ridges, transitions, and roof-to-wall conditions.

Turned-Down Slab

A slab detail where the perimeter thickens downward to help support building loads around the edge.

Translucent Panel

A panel used in roof or wall areas to admit natural light while still enclosing the building envelope.

U Terms

Underlayment

A protective layer installed beneath roofing materials to add moisture protection and secondary weather defense.

Unbalanced Snow Load

A snow loading condition where snow does not accumulate evenly across the roof due to wind or roof geometry.

Uplift

The upward force created by wind suction that can pull on roof panels, clips, framing, and connections.

Utility Opening

An opening framed or planned for mechanical, electrical, plumbing, or other service penetrations.

V Terms

Valley

A roof intersection line where two roof planes slope inward and channel runoff toward a low point.

Vapor Retarder

A material layer used to reduce moisture migration through roof or wall assemblies.

Ventilation

The controlled movement of air through the building envelope to support comfort and moisture management.

Ventilator

A roof or wall device used to exhaust air or improve airflow through the building.

W Terms

Wall Panel

A metal cladding panel used on the building walls to form the exterior weather surface or an interior liner surface.

Wall Girt

Another common reference to a horizontal wall framing member that supports wall panels between columns.

Web

The central portion of a beam or column section that connects the flanges and helps resist shear forces.

Wide Flange Beam

A common hot-rolled structural steel shape used in columns, rafters, and other framing applications.

Wind Exposure Category

A code-based terrain classification that affects design wind pressures depending on surrounding site conditions.

Wind Load

The pressure and suction forces caused by wind acting on the roof, walls, openings, and structural system of the building.

Window Framing

Reinforcement and trim support framing used to create and finish a window opening in the wall system.

X Terms

X-Bracing

Diagonal bracing arranged in an X pattern to help resist side forces and improve building stability.

Y Terms

Yield Strength

The stress level at which steel begins to permanently deform, making it an important structural design property.

Z Terms

Zee Purlin

A Z-shaped secondary framing member commonly used in roof and wall framing layouts for metal buildings.

Zinc Coating

A protective metallic layer applied to steel to help improve corrosion resistance in exposed conditions.

Need help tying these terms to a real project?

Use this glossary alongside your hazard research, permit research, and building system comparison process so you can ask better questions before ordering a metal building.

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