ThermoClip Hidden Deck Fastener

ThermoClip™ Thermally Modified Wood Hidden Deck Fastener

Use with Heat Modified or Chemically Modified Wood: Gap Spacing 1/4"(6,4mm)
thermally modified wood Hidden Deck Fasteners

Thermally modified wood decking stands as an environmentally conscious alternative to composite and chemically treated decking. Due to its reduced susceptibility to water absorption, expansion/contraction, rot, and decay, even softwoods that are typically unsuitable for outdoor use exhibit extended durability. The process of thermal modification alters the naturally occurring sugars in the wood, resulting in captivating, rich tones that permeate the material's entire thickness.

Although it is true that thermally modified wood decking moves much less than exotic hardwoods, minor movement in the boards is possible. The superior design advantage ThermoClip Hidden Deck Fastener brings over other hidden fasteners, is the absence of any aggressive sharp metal teeth that can dig in, gouge the board, and cause breakage. Whereas the ThermoClip deck fastener clip is smooth, made from Polyethylene, and allows the wood to expand and contract freely without worry of board breakage or screws snapping.

DeckWise Hidden Deck Fasteners modified wood deck fastener

Shadowline Black

DeckWise Hidden Deck Fasteners deckwise thermal wood deck fastener

Hardwood Brown

  • Two fastener color choices enhance camouflage characteristics
  • Legs automatically space deck board gaps to 1/4" (6,4mm)
  • Hardened stainless steel insert prevents screw over-driving
  • Black oxide coating on insert adds anti corrosion
  • UV resistant polyethylene outter shell comes in 2 colors
  • Hollow leg acts as a shock absorber, always keeping its shape
  • Allows for movement of width of the deck board
  • Unique design provides more groove tolerance, increasing hold-down
  • Premium American Made & U.S. patented
  • Limited Lifetime Warranty

* ThermoClip Hidden Deck Fastener Kits come in standard 90 and 175 complete counts. Black painted head #8 x 2" Stainless Steel Screws, T15 extended screw bit, and gap spacer tools. Other painted head screw colors and lengths are available and may be substituted.

Deck Fastener Features
Thermal wood Hidden Deck Fastener Dimensions thermoclip thermal wood deck clip
3X More Hold-Down Strength!

Unlike most all-metal hidden deck fasteners, which can react with wood causing staining, the ThermoClip deck fastener firmly holds decking to joists with up to 3X more hold-down strength. Designed for thermally modified wood decking, the color of the plastic resin also provides camouflage and conceals the fasteners between the board gaps for a more sleek, fastener-free surface.

Clip Construction
MaterialStainless Steel Insert
Polyethylene .883" x .883" Thickness: .036"
(22,4mm x 22,4mm Thickness: ,9mm)
Resources for Architects & Builders
CSI Divisions & Specs
DeckWise warranty emblem

DeckWise® ThermoClip Limited Warranty

In order to be eligible to make a warranty claim, you must complete the registration for warranty here: www.deckwise.com/warranty/register.html

Get more done with DeckWise® decking products!

ThermoClip hidden deck fastener legs automatically set consistant board gaps to 1/4" spacing. A 90 degree stainless steel screw through the fastener holds the decking tight to the joist, allowing the thermally modified wood the freedom it needs without breakage.

modified wood deck fastener Expansion Diagram

Do It Once, Do It Right, Do It Out Of Sight!™

Before installation ensure all deck joists are spaced evenly and level so that everything planes through appropriately. Consult your local building code for appropriate joist spacing. DeckWise® recommends 16” spacing on-center for all thermally modified wood decking products.

deckwise deck fastener thermal wood

Starter Board Countersink & Wood Plugs

install deck fastener on thermal wood

Edge Groove 90 Degree Screw Installation

DeckWise® ThermoClip Groove Specifications

thermally modified deck clip installation
Decking Compatibility
Board ThicknessBoard Width
A* = Measurement Of Your Decking B** = Measurement Of Your Decking

DeckWise ThermoClip Fastener System - 1/4" Spacing - for Thermally Modified Wood Decking - 175 pc Box for 100 Sq. Ft. of Decking - (Includes #8 x 2" Stainless Steel Screws)

Groove Dimensions
Thickness of CutCutting HeightCutting Depth
C = 5/32" (4mm) D*** = (A-5/32")/2 E = 1/2" (13mm)
Board Spacing
During Installation
F**** = 1/4" (6,4mm)

* If using 1-1/2" (38,1mm) or thicker material, you may need to upgrade to a longer screw option than what is typically packaged with the fastening kit.

** For decking 8" (20,32cm) or wider, the (A) dimension should be at least 1-1/2" (38,1mm). Using a wide plank such as this for surface decking will most likely cause cupping issues regardless of how the material is fastened if thicker material is not used.

*** This formula will create a symmetrical profile that allows you to flip and/or rotate the decking to be able to put the best side up.

**** Fastener automatically achieves correct gap spacing when boards are pushed tight during installation.

Available Kit Options

Boxes of ThermoClip Hidden Deck Fastener Kits come in many combinations. Kit variations of 90 (50 sq. ft.) and 175 (100 sq. ft.) counts are easily customized with variations of decking screws different styles, length and color.

ThermoClip Hidden Deck Fasteners Kit from DeckWise

Complete Kit

  • (175) ThermoClip ExtremeTC Hidden Deck Fasteners
  • (190) #8x2" (4x50mm) Stainless Steel T15 - Star Drive Screws
  • (1) 1/8" (3,2mm) High Speed Drill Bit
  • (1) T15 Star Driver Tips
  • (3) 1/4" (6,4mm) Spacer Tools
  • (1) Instruction Sheet
  • Wood Plugs: Ash or Pine ThermoPlugs Sold Seperately

90 Count

  • (90) ThermoClip ExtremeTC Hidden Deck Fasteners
  • (90) #8x2" (4x50mm) Stainless Steel T15 - Star Drive Screws
  • (3) 1/4" (6,4mm) Spacer Tools
  • (1) Instruction Sheet
  • Wood Plugs: Ash or Pine ThermoPlugs Sold Seperately
DeckWise ThermoClip Hidden Deck Fasteners Contractor Bucket

2 Gal. Contractor Bucket

  • (525) Hidden Deck Fasteners
  • (570) #8x2" (4x50mm) Stainless Steel T15 - Star Drive Screws
  • (6) 1/4" (6,4mm) Spacer Tools
  • (3) T15 Star Driver Tips
  • (3) 1/8" (3,2mm) High Speed Drill Bit
  • (1) Instruction Sheet

5 Gal. Contractor Bucket

  • (1050) Hidden Deck Fasteners
  • (1140) #8x2" (4x50mm) Stainless Steel T15 - Star Drive Screws
  • (6) 1/4" (6,4mm) Spacer Tools
  • (5) T15 Star Driver Tips
  • (5) 1/8" (3,2mm) High Speed Drill Bit
  • (1) Instruction Sheet

EXTREME® Ipe Clip® Series - U.S. Patent Numbers 8,464,488 and 8,806,829.
Original, “round”, STANDARD Ipe Clip® - U.S. Patent No. D470,039.

EXTREMEKD® and EXTREME4® Licensed under U.S. Patent Nos. 7,874,113 and 8,161,702 Patent.

Everything you need to get the job done!

Ipe Clip Hidden Deck Fastener ExtremeKD
Stainless Steel Screws from DeckWise
Stainless Steel Screws
Deck Board Spacers
T15 Star Drive Tip
T15 Star Drive Tip
1/8" Drill Bit
Tapered Ipe Hardwood Plugs
3/8" Tapered Ipe Plugs
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