DeckWise · Decking · reviewed September 14, 2026
What the manufacturer actually lists
Air-dried or kiln-dried hardwood, composite and PVC are listed categories.
Named species / categories
No species-specific listing established for this exact record. The material category above is not blanket approval.
Explicit exclusions
No exhaustive exclusion list found. Absence of a prohibition is not approval.
Conditions that change the answer
- The current page uses Extreme-S; older tables use Extreme4. Do not transfer a species-specific Extreme4 result to an Extreme-S kit without manufacturer confirmation.
- Board thickness 1-1/2 inch or more may require a longer screw. The product page calls for at least 1-1/2-inch thickness at widths of 8 inches or more.
- A species name alone does not approve the supplied profile, moisture condition, screw or exposure.
- For saltwater, pool chemicals or treated substrates, verify the complete metal combination and manufacturer corrosion guidance. A stainless insert is not a blanket marine approval.
Connection anatomy
See what the screw actually penetrates
The angled screw penetrates the clip, the first board, then the joist. The next board seats on the free wing; its opposite edge gets the next fastener.
Read with the exact product instructions. Features are simplified for visibility; these are not production drawings or structural details.
Dimensions belong to different parts
Installed gap, clip size, board thickness and groove cut are separate measurements. Mill tolerances and the sold accessory match remain separate approvals.
| Measurement | Inches | Millimeters | Applies to / limitation |
|---|---|---|---|
| Installed gap | 0.15625 | 3.969 | Use the matching spacing tools. |
| Required groove cut | 0.15625 | 3.969 | Manufacturer interface requirement, not clip thickness. |
| Required groove depth | 0.5 | 12.7 | Centered vertically: lower edge = (actual thickness − cut) ÷ 2. |
| Current clip envelope / tolerances | Unverified | — | Needs Verification; legacy Extreme4 dimensions are not assigned to Extreme-S. |
Metric values are calculated conversions, not added manufacturing precision.
The screw is part of the system
Published kit: #8 × 2-inch stainless T15. Confirm exact alloy, length and substrate configuration.
Installation sequence
Establish the starter-board face attachment and plug detail. Verify the selected board and kit before routing.
For the documented Ipe Clip interface, center a 5/32-inch cut, 1/2 inch deep. Check the actual supplied groove.
Hardwood: predrill a 1/8-inch pilot through the board at approximately 45°. Drive the screw through clip, board and into the joist.
Seat the next board on the exposed clip wing. Fasten its opposite edge; do not screw both boards through the same clip. Avoid overdriving.
Composite/PVC uses the manufacturer’s vertical screw path instead. Check the decking brand’s own instructions and kit. Resolve ends, perimeter and board joints separately.
Manufacturer instructions for this record
DeckWise Extreme-S product requirements ↗
DeckWise installation instructions ↗
DeckWise species and drying-condition chart (legacy Extreme4 naming) ↗
Read the current instructions for the purchased model. This reference does not certify wall capacity, warranty coverage or an Ipe Woods milling match.