About Joist Supports (USA)

What is the KlevaKlip Adjustable Joist Support AJH38G (USA)?

( UNITED STATES OF AMERICA patent NO 14/098253)

Watch our Adjustable Joist Support AJH38G (USA) Installation Video

The Adjustable Joist Support has been designed specifically to enable decks to easily be built over concrete slabs in areas where limited ground clearance is available. It is ideal for use when the step-down from your door to your concrete slab is between 4 inches (minimum) and around 10 inches (maximum)

The AJH38G has been specifically designed to be used with 2 inch wide (metrically measured at 38 mm) pressure treated timber joists for USA markets.


‚Äč360° view Adjustable Joist Support Assembled


How is the Product Purchased?

The product comes in boxes containing 24 joist supports and 24 base plates.(see photo below) Bolts, nuts, washers etc.  are purchased separately from your hardware store/merchant depending on what height you want to achieve.

Each Adjustable Joist Support ( joist holder + base plate) requires 2 x 3/8 inch Hex Head Bolts, 4 x 3/8 inch Nuts & 2 X 3/8 inch washers and 1 x 2 inch x 1/2 inch Galvanised screw anchor or similar.


                 How Packaged                     

Fully Assembled with Bolts,Nuts & Washers



Advantages of the Adjustable Joist Support 

    • Keeps your Joists off the concrete and free of unwanted moisture ingress. This prevents joist-rot through the bottom of your joists.
    • Is ideal for use on area where the concrete has built in "Fall" - To provide a level deck.
    • Quick and easy to use - purpose-built for the application
    • Gives a neat, professional look across your deck structure without resorting to various different packers and brackets to achieve your end result
    • Uses standard 3/8 inch hex head bolts, Nuts and Washers and  1/2 inch masonry anchor standard "off the shelf" from your hardware Store or Merchant .


Span requirements for base -plate positioning for AJH38G (USA) 

All based upon “continuous span” with joists set at 16 inches between centres.

All joists should be pressure treated for outdoor use.

Joist Size Recommended Span (feet)
Maximum Span (feet)
 2 x 4 inch 3 ft 3 inch 4 ft 11 inch
*2 x 6 inch 4 ft   6 ft  

*Joist span limited by lateral loading on bolts

What Length 3/8 inch Hex Head Bolts do you require AJH38G?

Note: All measurements based on using Galvanised long-threaded hex head bolts.

Hex Head Bolt Length Min Height to Bottom of Joist Max Height to Bottom of Joist Min Height to Top of 4/6 inch Joist Max Height to Top of 4/6 inch Joist
2 1/2 inch 5/8 inch 1 inch 4 1/4 / 6 1/4 inch 4 1/2/ 6 1/2 inch
5 inch 3/4 inch* 3 1/4 inch 4 1/2*/ 6 1/2 inch 6 1/2 / 8 1/2 inch
**No Bolt 1/4 inch 3 3/4 / 5 3/4 inch

* If using long bolts at low heights, to prevent the bolts protruding past the top of joist, the end of the bolt will need to be cut off.

** When Using Joist Support Only.