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Roofing Superstore Adjustable Decking & Flooring Joist Cradle (10mm - 40mm)

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Product Description

The Cradle System is a patented self-levelling joist support system used for levelling uneven floors and supporting roof decking. The system is fully tested and conforms to the Loading Conditions for the Flooring as laid down in BS5399.

It's unique design and buttress thread enables the cradle to carry high loads with finite adjustment to allow for accurate levelling of the floor / deck surface.

Diameter: 90mm
Overall Height: 65mm
Load Capability: 7 kN/m2
Adjustability: 10mm - 40mm (Greater heights can be achieved using base plates)


Please note, the recommended coverage is 1x decking cradle every 400mm per run of timber, this is dependent on load.

A Levelling Solution for Uneven Floors & Roof Decks

  • Self-Levelling

  • No Packers Required

  • Easy to Install

It is the ideal solution for supporting timber joists for decking purposes on balconies and roof terraces. The unique recycled plastic body is designed to support joists keeping them off the roof deck and away from the drainage of the roof. Cradles can be adjusted to allow for the falls in the roof. The cellular rubber base support spreads and softens the impact of the imposed load.

The cradle can also be used on uneven and out of level floors. The design enables the soft sprung feel of a timber floor to be achieved over concrete sub-bases. The cradle allows for fast installation and removes the need for wet and slow drying times normally associated with cementicious screeds. The void created by the cradle can also be insulated or used for service runs etc. The system is ideal for use in fast track building programs or conservatory floors.

Technical Information

The cradle acts purely as a loading support, so care should be taken when loading the cradle to ensure that the sub-base can accept the load. The table of load centres is for a standard joist size. The load can be distributed by increasing the number of cradles.

Please note, this is a flat-based product. The timber has to be 47mm or 2 inches wide, the height can be whatever you require.

Product Documents

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Height 10mm - 40mm Decking Support Cradles

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Questions & Answers


Would this be suitable on grass


No it would need to be laid onto a solid surface.


Will 2"x2" timber work with these? At the lowest (10mm) rise will the top of the wood clear the plastic sides?


A 2"x2" joist would not protrude over the top, for a joist this size you would need to use the lower rise cradle linked below.



Do you know the maximum fall this levels?


This offers height adjustment from 10mm to 40mm so it could not adjust any fall greater than that i am afraid.


Hi, one answer above says these are suited to a 2" joist. My summerhouse joists are 60mm wide (2.36 inches). Are they too wide for this joist support?


Yes they would not quite sit in the cradle I am afraid.


Hi could they be used to level a 5mx3.5m summer house under bearers?


They could yes as long as it does not exceed their load capacity of 7 kN/m².



I'm renovating my Victorian property and looking to extend a suspended wooden floor with a crawl space through to an old wash house. The wash house floor is a solid stone floor so has no crawl space and is at the same level as what the joists from the adjoining room sit. My hope would be to use these joist cradles to support joists at a smaller depth to take out the difference in levels and maintain an air gap for ventilation so the floor could continue through. Would this be a suitable choice and do you know if it would be acceptable to building control? Loading would be max of 1.5Kn/m2


This would certainly be suitable for creating a suspended floor definitey, with regards to building control always best to check with them first before making a purchase.


Hi would a 5 x2 drop into the slot ok . They are normally between 45mm and 47 mm Thankyou


Yes these are suited to a 2" joist so would be fine.


can these be used to level a 6x4 shed on a patio.


Yes you could use these for that purpose.


I’m looking to lay decking on top of my current stone patio. Can these be used on top of my patio? Do these fix to the concrete floor? If so, how? Many thanks.


These can be used on top of your Patio no problem, they do not need to be fixed as the framework resting on them will hold them in place. You would also need to have a support per every 400mm length of timber.

Product Reviews

4 / 5 10 reviews
Clare Morton
9th August
I'm using the risers for a frame to support a 16 x 8 shed/workshop. Leveling out uneven concrete. Make sure you have one placed every 1.5 to 2 ft apart for this size structure.
Mark Phillips
6th August
Good quality, easy to use.
Trevor Gill
30th April
Easy to install perfect for shed base
Andrew Boote
19th July 2020
Customer service appalling
Philip Curle
8th June 2020
Split and drop in no time....Waste of money
Mrs Bell
4th June 2020
Brilliant item, made levelling our decking base so much easier and quicker. Cheapest I could find online but this does not affect the quality- would highly recommend
Mr & Mrs Johnson
30th May 2020
Very good quality
27th May 2020
Very good leveller used for a raised deck above slab packers
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Roofing Superstore Adjustable Decking & Flooring Joist Cradle (10mm - 40mm)

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