Grad® systems : to build rainscreens or open-joint cladding, soffits, fences

The grad® system comes as an aluminum track (also called rail) pre-fitted with our grad® clips. 


Grad® clips are not made of your traditional plastics. 

Polyoxymethylen (or POM) is an engineering thermoplastic that is often used in the production of ski boots. With great dimensional stability, high mechanical strength and rigidity, corrosion resistance, toughness at low temperature (down to 40 C = 40 F), excellent resistance to moisture, gasoline, solvents and many other chemicals of neutral pH. It means the clips can be used across wide temperature range (in air 50 to +90 C = 60 F to +195 F), POM is a favorite across many fields in the construction industry and is recyclable.

grad® clip

 Rail length: 6ft – 6.5ft 

Why are clips pre-set onto an aluminum track? What does it mean? 


Traditional cladding installations use furring strips onto which boards are fixed either thanks to clips that are individually fastened one at time onto the strips, or boards are fastened with screws that go through the boards and through the furring.

Our rails replace furring strips, our clips are pre-fixed onto the tracks to avoid individually fastening them, and boards are snapped on the clips so you don’t need to fix boards with screws.  

Installation is fast, easy, straight-forward, and leaves no margin for errors.

How to use grad® rails?

Rails are to be fastened onto structural  elements (studs, beams, concrete…). The type and number of required fasteners depend on the substrate and the wind zone. Check our installation guide for more recommendations.

Rails must be parallel to each other (simply use a level) and the clips from one rail to the other must be aligned. There is no need to use one rail per board! You need as many rails as you would need standard furring strips.  


The system is used for different applications:

— narrow battens

— wide boards

— shiplap

— open-joint cladding

— vertical/horizontal/diagonal siding

— soffits

— fences

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Which grad® rail should I use? 

All our 3 rails can be used to build all the above but there are some differences between them:

Mini Rails will offer a 0.47” air gap between the wall backing and the back of the outter cladding. In case of open joint cladding, Mini Rails do not allow boards from being removed with our special keys. Boards can only slide off 

Start Rails will offer a 0.71” air gap while offering the possibility for boards to be removed in case of open joint cladding

PR39 rails will offer a 1.5” air gap, and open-cladding boards will be removable with our special keys



According to US good practices: the gap between the back of the outer cladding and the wall should be min 3/8”


How do I align one rail after another? 

Connector pieces help lay one rail after another but no need for one connector piece every time two rails are positioned one after another: the piece is only to help position the second rail properly. No need to fasten it, just re-use it as a template for the next 

Check our installation guide for further details. 

·       Always refer to the latest installation guide for instructions

·       Rails can be fastened over the house wrap or on battens

·       Horizontally for vertical cladding, or vertically for horizontal cladding

·       Follow board manufacturer recommendations for rail spans

·       Use specially Grad®-grooved boards from our US partners

·       Snapped the boards on top of the clips

·       Enjoy the lasting results!

Case Study: Our Lady Queen of Heaven - Lakes Charles, LA