No visible screws, no exposed nails, no caulked joints. The concealed clip system is what makes modern aluminum cladding look the way it does — here's exactly how it works.
No visible screws. No exposed nails. No caulked butt joints. The concealed clip fastening system is what separates modern architectural aluminum cladding from legacy siding products — and understanding how it works helps you specify it correctly and install it faster.
The Basic Principle
A concealed clip system works by mechanically locking each panel into position using a metal clip that is attached to the substrate before the panel is placed. The clip engages a channel on the back of the panel, securing it horizontally and vertically without any fastener penetrating the panel face. From the exterior, the result is a continuous, uninterrupted surface — no screwheads, no sealants, no visible attachment hardware.
System Components
- Extruded aluminum clips: attach directly to substrate or furring, spaced to match panel channel geometry
- Panel channels: formed into the top and bottom edges of each panel — the clips engage these
- Starter strip: horizontal track that establishes the first course level line and first panel engagement point
- Top trim and J-channel: close out the system at sills, openings, corners, and terminations
Substrate Requirements
The clip system can attach directly to wood sheathing (OSB or plywood), cold-formed steel stud framing, concrete masonry units (CMU), or over furring strips mounted to any substrate. The key requirement is that fastener spacing must hit solid backing — typically 16" or 24" on-center for wood framing. A continuous drainage plane (housewrap or building paper) should be installed beneath the clips for proper moisture management.
Installation Sequence
Installation follows a simple bottom-to-top sequence:
- 1. Verify plumb and level of substrate, install drainage plane
- 2. Snap horizontal chalk lines at clip spacing intervals
- 3. Install starter strip at base — this is your level reference for the entire run
- 4. Fasten first row of clips along the starter strip line
- 5. Engage first panel course into starter strip and clips
- 6. Install next clip row, engage second panel course — repeat
- 7. Complete terminations with J-channel, corner trim, and cap pieces
Thermal Expansion — Why It Matters
Aluminum expands and contracts significantly with temperature change — approximately 1/16" per 10 linear feet per 100°F of temperature swing. A concealed clip system is specifically designed to accommodate this movement. The clip engagement allows each panel to float laterally within defined limits, preventing buckling in heat and preventing stress fractures in cold. Exposed fastener systems, where screws penetrate the panel face directly, do not allow this movement and are prone to slot elongation, cracking, and sealant failure over time.
Removal & Access
One underappreciated advantage of the clip system is that panels are individually removable for inspection, repair, or utility access — without damaging adjacent panels. Remove the cap trim, disengage the clip at the top of the panel, and lift the panel out. This is impossible with adhesively bonded or mechanically nailed systems.
Tools Required
No specialized tools are required for a standard installation. You need a level, chalk line, drill/driver, aviation snips, and a miter saw for cut-to-length work. The panels themselves arrive pre-cut to your specified lengths, so field cutting is typically limited to perimeter trimming.
Download our full installation guide from the Technical Specifications page for clip spacing charts, corner detail drawings, and substrate fastener schedules.