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Exterior Pro Materials
MAC Metal Architectural›Metal Block Collection

Metal Block

Metal Block by MAC Metal Architectural gives designers and architects total creative freedom through custom-length steel panels with no visible screws or joints along their entire span. Customizable cross-groove spacing — from 12" to 42" — lets you dial in a precise architectural expression: a fine 12"×12" tile pattern, a bold 12"×24" ceramic-block rhythm, or any interval in between. Available in panel runs up to 60 ft with the same TEXTURAL III & IV matte paint system that defines the MAC Metal line. Installs horizontally, vertically, or diagonally on plywood, wood furring, or metal furring. A vented version provides 4.594 sq.in. of ventilation per linear foot.

1" depth (25.4 mm) · 1.32 lb/ft² (24g)3830.4 Pa / 80 psf @ 16" o.c. wind9 colours
Request a QuoteDatasheet

Available Colours

9
Metal Block - Anthracite

Anthracite

Signature Collection

Signature Collection(3)

Inspiration Collection(6)

Colours shown are approximate representations only and may appear differently on screen than the actual product. Request a physical sample before making your final decision.

Profiles & Specifications

Metal Block - Metal Block profile
MBMetal Block

Pre-painted galvanized steel wall panel with no visible screws or joints along the entire panel length. Customizable cross-groove spacing from 12" to 42" (standard 24") creates either a 12"×12" tile look or 12"×24" ceramic-block aesthetic. Custom lengths up to 60 ft. The serrated clip system allows individual panel replacement in case of damage without disturbing adjacent panels.

LengthCustom up to 60' (18.29 m) — assorted according to plans and specifications
Height / Width12" coverage (304.8 mm)
Thickness1" depth (25.4 mm)
Panel Weight1.32 lb/ft² (0.60 kg/m²) — 24g | 1.65 lb/ft² (0.75 kg/m²) — 22g
Panels/Box50 panels/box
CoverageDepends on custom length ordered
Wind Resistance3830.4 Pa (80 psf) @ 16" o.c. · 3112.2 Pa (65 psf) @ 24" o.c. · 1995 Pa (41.7 psf) @ 36" o.c. · 2384.3 Pa (49.8 psf) @ 48" o.c. (ASTM D5206-06A)
InstallationHorizontal / Vertical / Diagonal — screws every 16" to 48" o.c. in pre-punched holes
BackingPlywood min. 5/8" | Wood furring 16" o.c. | Metal furring 16" o.c. — all furring must be level horizontally and vertically

S junction clip available for panel jointing at notched ends. TEXTURAL III & IV paint system — matte metallic and solid finishes. Mandatory end reinforcement fold for 24g & 26g panels (optional for 22g). Individual panel replacement possible without removing adjacent panels.

Metal Block - Metal Block Vented profile
MB-VMetal Block Vented

Ventilated version of the Metal Block panel for use as siding or soffit. Provides 4.594 sq.in. of ventilation per linear foot of profile while maintaining the same visual profile, dimensions, and installation system as the standard Metal Block.

LengthCustom up to 60' (18.29 m) — same as standard Metal Block
Height / Width12" coverage (304.8 mm)
Thickness1" depth (25.4 mm)
Panel WeightSame as standard Metal Block (1.32 lb/ft² at 24g)
Panels/Box50 panels/box
CoverageDepends on custom length ordered
Wind ResistanceSame profile ratings as MB
InstallationHorizontal / Vertical / Diagonal — identical fastening to non-vented panel
BackingSame as standard Metal Block

Ventilation openings: 4.594 sq.in. per linear foot. Ideal for vented soffit applications while maintaining the Metal Block visual aesthetic.

Certifications & Testing Standards

Metal Block meets or exceeds the following Canadian and international performance standards.

Test / PropertyStandardResult / Value
CAN/ULC-S135 — Fire Resistance, Non-Combustible Construction (Canada)
-Certified
ASTM E84 — Class A Fire Resistance (USA)
-Certified
NFPA — 0 Flammability Hazard Rating
-Certified
ASTM E2768 — Non-Combustible Construction for Wildland Urban Interface (WUI) in California
-Certified
W.U.I. Wildland Urban Interface Accreditation — Registration 8140-2358-0500
-Certified
ASTM D5206-06A — Wind Load: 3830.4 Pa (80 psf) @ 16" o.c. | 3112.2 Pa (65 psf) @ 24" o.c. | 1995 Pa (41.7 psf) @ 36" o.c. | 2384.3 Pa (49.8 psf) @ 48" o.c.
-Certified
ASTM E330 — Wind Deflection: +3100 / −3100 Pa @ 16" o.c. | +3000 / −3100 Pa @ 24" o.c.
-Certified
ASTM E283 — Air Leakage of Wall Assembly: Compliant
-Certified
ASTM B-117
-2000h — Corrosion Resistance Standard for MAC Screws
40-Year Limited Warranty — Paint Defects, Discoloration & Chalking
-Certified
LEED Recyclable —
-86% Recycled Content; 100% Recyclable at End of Life
FBC — Florida Building Code (Evaluation EC-155 — in progress)
-Certified
TDI — Texas Department of Insurance accreditation (in progress)
-Certified
Miami Dade / ASTM E1886, E1996, TAS 202 & TAS 203 — ZHLA.63 Hurricane Resistance (not yet tested)
-Certified

Compatible Accessories

Installation Guide

  1. Metal Block panels have no visible screws or joints along their entire length. Panels fit together one inside the other (male/female clip system) to allow thermal expansion — never force panels or screw through the face.

  2. End reinforcement fold is mandatory for 24g and 26g panels, optional for 22g. Before installing, use the MAC folding tool for Versa & Metal Block to fold panel ends at 90° (½" or 1" fold minimum) — this prevents end deformation and panel separation.

  3. Install Starting Strip (M10G) 3½" above where the wall will start. Level carefully — it guides the entire installation. Use MAC 1-1/2" flathead metal screws or 1-1/8" flathead wood screws. For vertical installation, use M50G drip molding instead; no starter strip required.

  4. Drive screws every 16" to 48" o.c. in pre-punched holes with moderate pressure only. Screws must not exert upward or downward pressure on the panel (causes deformation and joint spacing).

  5. Do NOT install over ZIP System Insulated R-Sheathing or similar dual-composite panels — insufficient rigidity causes movement, deformation, and oil canning.

  6. Check alignment every 3–4 panels. Remove protective film only after panel is installed — leaving it in place protects the finish and allows visual inspection of alignment.

  7. For inside corners (M22G — horizontal): slide panel end into molding leaving 1/8" gap for expansion. For outside corners, install M20G (2-piece, apply MAC sealant inside finishing molding before stapling) or M21G (single-piece inverted fold).

  8. For window openings: install J Trim (M01G) on both sides and bottom; install drip cap above. If the last panel does not reach full height, cut with extra ½" and create a 180° fold for additional support — install cut panel backwards.

  9. Apply MAC sealant in the female clip in ½" × 1" strokes every 24" starting from the 4th floor on any tall building, or from the 2nd floor in wind-exposed risk areas.

  10. For multi-storey wood structures: install horizontal expansion moldings at every floor. For steel structures: install horizontal expansion moldings every 30 ft. For very long walls: install vertical transition moldings every 30 ft.

  11. Cut panels using the MAC Guillotine designed for Versa and Metal Block, or with steel snips/shears. Electric saws and grinders are NOT covered by MAC warranty and may leave metal particles that accelerate corrosion.

  12. Notify your supplier before installing more than 500 sq. ft. if any product issue is discovered during installation to ensure warranty coverage is preserved.

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