Installation Info

Click Here for USA Adjustable Joist Support


Adjustable Joist Support Installation Video (Aus/NZ)

Installation Steps for KlevaKlip Adjustable Joist Support AJ45KIT & AJH45G (Aus/NZ)


Click here for AJ45KIT PDF Install Steps

Note: All Bolts, Nuts, Washers & Dynabolts included for 16 Joist Supports + Base Plates 

Click here for AJH45G PDF Install Steps

Note: Each Adjustable Joist Support (joist holder + base plate) requires (Galvanised) 2 x M10 Hex Head Bolts, 4 x M10 Nuts, 2 X M10 washers & 1 x 12mm x 50mm Galvanised Dynabolt or 10mm x 50mm Masonry Bolt or similar.

Step 1 - Positioning Joist Support Base Plates

Mark out positions for the base plates on the concrete slab (see table for minimum span requirements for various width joists) These are all based upon “continuous span” with joists at 450mm between centers. Either use a “straight edge” or run a string line from one of the notches in the outer base plates and flick the line for the positions of the internal base plates.


Step 2 - Drill Holes for Base Plates

Drill holes for base plates (or for joist supports if securing them directly to concrete) using 12 mm masonry bit for 12 mm dynabolts or 10 mm masonry bit for 10 mm masonry bolts.


Step 3 - Inserting the Hex Bolt

Insert 10mm hex-bolt through base plate.

AJ45KIT is designed to provide a "top of the joist" height from 86mm using 100mm length fully threaded bolts + 70mm x 45mm joists to 150mm  + 90mm x 45mm joists.

AJH45G is designed to provide a "top of the joist" height from 86mm using 60mm long bolts + 70mm x 45mm joists to 170mm using 120mm long bolts  + 90mm x 45mm joists.

You can increase this height to 220mm by using 140mm x 45mm Joist (This is the maximum Joist height you can use).


Step 4 - Joist Adjustment

Fix base plate to concrete using 12mm DynaBolts or 10mm masonry bolts. Repeat steps 1 - 4 for all base-plates to be installed.

Tip No. 1 Before fully tightening DynaBolts or Masonry bolts, either use a straight edge or run a string line along the edge of the base-plate vertical bolts to ensure they line up correctly. Adjust base-plate in the slot if required.

Tip No. 2 Check all base-plates are "square" to the above-mentioned straight edge or stringline


Step 5 - Attach Joist Support

Attach joist support onto hex bolts and adjust to approx height required. Semi-tighten nuts - this will tighten the whole structure enough to withstand joists being inserted and secured



Adjust joist to correct height using dumpy or laser-level or string line. (Note - you will need to loosen the nuts off if the joist support height needs adjusting)

Fully tighten nuts locking the joist support





Step - 6 Insert Joist into Support

Insert joist into joist support and secure with minimum 2 of 35mm x 3.2mm galvanised connector nails on each side of the joist support.

Tip - when fixing nails, brace the other side of the joist support with your foot to minimise vibration.




How to calculate how many Adjustable Joist Supports are needed for your deck?

We quite often find that people have miscalculated the number of adjustable joist support required for their decking area. We believe the main cause of this is that people work out the length of their joists, and simply divide by the "support spacings" (taken from our span table) they have decided on between the supports - eg - having a 3 metre length joist with spacings of 1 metre to give 3 supports.

Wrong! - This does not take into account the initial support at the start of the joist.

Therefore, the correct answer would be 4.

Similarly, when working out the number of joists required, you need to work out the number of "joists spacings" along your deck and remember to add one for the initial joist.

So, to finalise the number of supports you will need for your deck, multiply the number of joists on your deck by the number of supports to be placed along your joists. This should give you an accurate answer.



Load Bearing:

The KlevaKlip Adjustable Joist Supports system has been independently tested to support a load bearing capacity of 350 kg per square metre when used at the recommended joist spans listed below.

Corrosion Protection:

KlevaKlip Joist Supports and Base Plates have been hot dip galvanised in accordance with Australian Standards AS/NZS 4680:2006 (ISO 1461) 

MINIMUM and Maximum Top of Joist Information

Minimum top of joist heights

76 mm – fixing joist bracket direct to concrete no base-plate no bolts and using 70mm joist


86 mm – using Joist Support KIT- lowest height achievable using base-plate, 100mm bolts and joist bracket with 70mm joist

86 mm – using Adjustable Joist Support- lowest height achievable using base-plate, 60mm bolts and joist bracket with 70mm joist


106 mm – using Joist Support KIT- lowest height achievable using base-plate, 100mm bolts and joist bracket with 90mm joist

106 mm – using Adjustable Joist Support - lowest height achievable using base-plate, 60mm bolts and joist bracket with 90mm joist


Maximum top of joist heights

150 mm – using Joist Support KIT,100mm bolts & 90mm joist

170 mm – using Adjustable Joist Support, 120mm bolts & 90mm joist


180 mm – using Joist Support KIT, 100mm bolts & 120mm joist

200 mm – using Adjustable Joist Support, 120mm bolts & 120mm joist


200 mm – using Joist Support KIT, 100mm bolts & 140mm joist

220 mm – using Adjustable Joist Support, 120mm bolts & 140mm joist

Note – the above information is a “practical” rather than an “absolute” document. There will be a number of ways to achieve the heights mentioned with different sized joists, however the installer should always be mindful to operate within the KlevaKlip product parameters and relevant joist span tables 

Heights achieved when using 100mm for AJ45KIT, 60mm & 120mm long M10 Hex Head Bolts for AJH45G Adjustable Joist Supports (Aus/NZ)? 

Note: All measurements for 60mm &120mm are based on using Galvanised Zenith brand M10 hex head long-threaded bolts.

 Adjustable Joist Type Hex Head Bolt Length Min Height to Bottom of Joist Max Height to Bottom of Joist Min Height to Top of 70/90mm Joist Max Height to Top of 70/90/140mm Joist


Joist "Kit" (AJ45KIT)

100mm 16mm 20mm 86* / 106mm 130 / 150 / 200mm

Standard Adjustable Joist


 60mm  16mm  20mm 86 / 106mm  90 /110
120mm 18mm 80mm 88* / 108mm 150 /170/ 220mm
**No Bolt 6mm 76 / 96mm

* 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.

Span requirements for base- plate positioning for AJ45KIT & AJH45G (Aus/NZ)

All based upon "continuous span" with joists at 450mm between centre's.  

      Joist Size Recommended Span (mm) Maximum Span (mm)
70 x 45 MGP10 800 1200
90 x 45 MGP10 1000 1500
90 x 45 MGP12 1200 1600
*120x45MGP10 1200 1800
*140x45MGP10 1200 1800

 * Joist span limited by lateral loading on bolts