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DeckWise® Extreme4® Invisible Terrace Fixing

Invisible Fixing Clips For Terraces (4mm)

Use on Air-Dried, Kiln-Dried Timber, Thermal Wood & Composite Material

deckwise extreme4 hardwood clip brown - front view
deckwise extreme4 hardwood clip brown - back view
Choose trim head screws (black painted head only) or self-drilling/heat treated screws to be packaged with your DeckWise® Hardwood Fixing Kits (185 count).
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.

Product Features:

  • Integrated spacer wedge perfectly spaces planks at 4 mm
  • Constructed from UV resistant polyethylene resin
  • Stainless steel insert coated with black oxide for corrosion resistance
  • Fixing screws installed a 45° angle into plank down into sleeper joists
  • Unique design provides more surface area contact in groove profile for added strength
  • Suitable for air and kiln dried hardwoods, composite, or thermo-wood planks
  • Permits air dried hardwood contraction on its width
  • Permits kiln dried hardwood expansion on its width
  • Permits PVC and composite movement on its length
  • Choose from 3 clip color options; Black, Brown, Grey
  • Limited Warranty available
  • Premium American Made & U.S. patented
  Dealer Resource Portal   Timber Specie Chart

smooth hardwood surface built with deckwise fasteners
blemish free hardwood terrace hidden fixings
exotic ipe hardwood terrace built with deckwise hidden deck fasteners

Timber Planks Stay in Place

Precise Gap Spacing & Plank Position
deckwise hidden hardwood fastener clip spacing diagram

1. Expansion direction of plank

2. Contraction direction of plank

3. Top of the terrace timber planks

4. Screw secured side of planks

Our unique EXTREME4® side-mount concealed hardwood fixing clips were invented and patented in the USA in the early 2000's. The reason they work so well is because only one side of the timber plank is fastened to the underlying sleeper. This permits the opposite side of plank to move naturally. This simple terrace fixing method guarantees even gaps over time as well as end-to-end terrace planks.

Extreme4® Toughness Allows for Expansion on Plank Width

Polyethylene Material Promises High Performance

deckwise hidden hardwood fastener stainless steel insert

1. Hardened reinforcing stainless steel insert

  • Guarantees precise screw positioning; prevents over-driving
  • Black oxide coating for added corrosion resistance
  • High quality hard stainless steel used in manufacturing

2. Square Biscuit Design Made With Polyethylene Resin

  • Biscuit shape has more surface contact with the plank
  • Polyethylene resin injection molded for additional strength
  • Integrated spacer leg wedge returns to its original size after compression

Invented for hardwood terraces, the colour of the EXTREME4® concealed fixing clip also helps to further camouflage and make it invisible between timber plank gaps. Hence, it is truly a concealed terrace fixing system. Also perfect for thermally modified timber!

The hardened stainless steel insert adds hold down strength between terrace planks and sleeper joists. Up to 3-times more holding power than other imitation invisible terrace fixings. This removes any chance terrace fixing screw will pop up as the timber planks expand and contract.


Integrated Spacer Wedge

Automatic 4mm Timber Plank Gap Spacing

deckwise extreme4 hardwood clip

1. The “H” shaped spacer wedge leg on the Extreme4® compresses with the movement of terrace planks during expansion. It will return to its original shape once the plank begins to recede.

2. The 4mm wedge spacer guarantees consistent spacing between planks. (Attention must be made to climate acclimation on the job site before installation; specific wood specie used; plank width; and climate conditions.)

3. U.S. patented stainless steel insert design guarantees higher strength of the fixing clip during installation.

4. Use with most Hardwoods, Thermally Modified Woods and PVC/Composite materials.

deckwise extreme 4 fastener collapsing legs

Compressed leg Wedges Return to Original Size

Plank Gap Spacing is Guaranteed Uniform

Polyethylene Resin Injection Molded Around Insert

Fixing Dimensions

deckwise extreme4 hardwood clip dimensions

Hardwood Clip Construction

Material Stainless Steel Insert Available Color
Polyethylene 22,4 x 22,4 x ,9 mm deckwise hardwood clips

Timber Compatibility

Air-Dried Timber Kiln-Dried Timber Composite Timber

Resources for Architects & Builders

CSI Divisions & Specs

Allows Contraction on Width of Air-Dried Hardwoods

Our installation system of 45 degree angled screws secures timber planks firmly to the sleeper joists while allowing just one side of the plank to remain totally free to move with expansion and contraction. Pre-drilling screw pilot holes is always recommended to ensure planks do not crack or split.

deckwise extreme4 contraction diagram

Allows Expansion on Width of Kiln-Dried Hardwoods

Our DeckWise® Heat-Treated Stainless Steel installation screws are a great option. These screws have a specially engineered 4-sided nail point tip that pierces planks quickly. Its' serrated thread minimizes plank splintering or splitting, even when installing near an edge. Or simply use our standard black painted trim-head terrace screws included in each concealed clip kit. Our screwing method also hides screw heads inside the clip insert for a professional, clean appearance.

deckwise extreme4 expansion diagram

Installing Screws into Planks and Sleepers

Our Invisible Terrace Fixing Clips are uniquely installed with screws that run through the timber planks' edge slot groove into underlying sleeper joists at a 45° angle.

The method we require to install fixing screws at a 45 degree angle through the clip into the hardwood plank greatly increases hold-down strength up to 3X. Studies have proven that, screws in general have more strength when they are screwed at an angle. This provides the screw threads more gripping power and more bite into the timber.

  • Ensures a solid terrace surface, free of top-side screws
  • Confirms perfect position of plank gaps
  • Simply install Extreme4® clips from the top-side down
  • Allows planks to naturally contract and expand on one side
  • Stainless steel fixing screws secure planks firmly for a long-term terrace
  • Self-drilling terrace screws allow quick installations and efficient installs

Enables Expansion/Contraction on the Length of Composite Planks

Driving fixing screws directly down at 90 degrees through our concealed clip is recommended for PVC and composite material. This method allows the material to move naturally along its’ length. Generally there is absolutely no need to screw through the composite plank itself. PVC & composite material only travels on its length, not its width. Plank spacing will remain accurate and terrace clips will be invisible between the gaps.

deckwise extreme4 composite expansion diagram
deckwise extreme4 composite diagram

DeckWise® Extreme4® Installation Specifications

deckwise extreme 4 fastener specifications

Plank Compatibility

Plank Thickness Plank Width
*A = Measurement Of Plank Thickness **B = Measurement Of Plank Width

Groove Dimensions

Thickness of Cut Cutting Height Cutting Depth
C = 4mm ***D = (A-4mm)/2 E = 13mm

Plank Spacing

During Installation
****F = 4mm

* If utilizing 38,1mm or thicker material, longer screw options may be required than what is generally included with this invisible terrace clip kit.

** For terraces 20,32cm or wider, the (A) dimension must be at least 38,1mm. Utilizing a wide plank such as this for terraces will almost certainly generate cupping issues despite of how the material is fixed if thicker material is not used.

*** This formula will produce a symmetrical edge slot profile that enables you to reverse and/or rotate the plank to be able to place the ideal side up.

**** Invisible clip instantaneously achieves proper gap spacing when planks are pushed close together in the course of installation.


edge groove board

Symmetrical/Reversible Planks

Install the Best Side of Timber Planks

  • Symmetrical Side Grooves: Timber planks have edge slot grooves which are symmetrical on each side and are centered in the sides of the planks.
  • Two smooth surfaces: Because timber planks have symmetrical grooves, the plank can be flipped over to use the best side facing up.
edge groove board profile

Whatever specie of hardwood a person may choose for their terrace, the planks are not always attractive on each side. Many terrace fixing methods have an edge mount profile which does not allow planks to be turned for the ideal smooth surface. This is certainly not true with our Extreme4® concealed fixing clips simply because the fixing profile is symmetrical on both sides.

Maybe there is a scratch on a part of a patio timber plank? Merely reverse the plank and install the better looking side upward. Due to the fact our method utilizes either side of the timber plank, installment time is improved and earnings are not likely lost on planks which can not be mounted.

Inquire with your timber dealer for pre-grooved terrace planks or utilize a router machine on your job site to cut the groove slots.


Timber Plank Replacement

Review these steps to replace damaged terrace planks

DeckWise® Extreme4® unseen terrace clips come with the extra benefit of effortless and easy timber plank replacements. Generally there is absolutely no need to disassemble your terrace simply to remove a damaged timber plank. Merely observe this website link in order to view the procedures needed in our Plank Replacement Guide.

  Plank Replacement Guide

Available Terrace Fixing Kit Options

DeckWise® Extreme4® Invisible Terrace Clip kits (185 count) can be combined with different combinations of our heat-treated timber screws or trim-head painted screws. Invisible Hardwood Clip Kits could also include different colored terrace clips as well as various sized spacer wedge legs for specific terrace applications.

deckwise hardwood clip kit box

Complete Kit

  • (185) DeckWise® Extreme4® Invisible Clips
  • (200) 4 x 50mm Stainless Steel T15 - Star Drive Black Screws
  • (12) 9,5mm Tapered Ipe Plugs
  • (1) 3,2mm High Speed Drill Bit
  • (1) T15 Star Driver Tips
  • (3) Spacer Wedges
  • (1) Instruction Sheet

deckwise hardwood clip kit box

7,5L PRO Bucket

  • (555) DeckWise® Extreme4® Invisible Clips
  • (600) 4 x 50mm Stainless Steel T15 - Star Drive Black Screws
  • (3) 3,2mm High Speed Drill Bit
  • (3) T15 Star Driver Tips
  • (6) Spacer Wedges
  • (1) Instruction Sheet

deckwise extreme kd hardwood clip
Extreme4®
stainless steel decking screw
Stainless Steel Screws
deckwise board gap spacer
Spacer Wedge
t15 driver tip
T15 Star Drive Tip
high speed drill bit
3,2mm Drill Bit
deckwise hardwood plug
9,5mm Plugs
deckwise warranty

DeckWise® Invisible Terrace Clip Limited Warranty

To make a DeckWise® product claim, warranty registration form must be completed here:
www.deckwise.eu/en/warranty

Limited Warranty
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