READY Floor Design & Foundation Details
READY Super Slab replaces the following mesh sizes when carrying the maximum loads shown below:
- 20MPA - 202PJRF
- 25MPA - 252PJRF
- 30MPA - 302PJRF
- No allowance has been made for settlement and deformations of the ground
- Calculation for loads acting in the middle of the slabs and on joints
- Subsoil: k > 0.03N/mm3 or ‘good ground’ as defined in NZS3604: 2011 including amendment 11 to B1/AS1.
- Allowable slab thickness up to 200mm
- Saw cut joints: max. 6m x 6m
- Concrete: READY Floor
- Supplementary steel should be located in the perimeter foundation and at re-entrant corners
- Does not include slabs constructed on expansive soils or sites prone to liquefaction.
- Loads: wheel - point - pallet
- It is recommended that external slabs are at least 120mm thick
- Mesh sizes 150/150 = wire spacing; A = area of steel in mm²/m.
Allied READY Floor concrete can be used as an alternative to the reinforcing detailed in NZS3604:2011 clause 188.8.131.52 combined foundation and edge detail, including Amendment 11 to B1/AS1.Allied READY Floor concrete is used in conjunction with two D12 reinforcing bars in edge foundations when poured integrally with the slab. At internal slab thickening under internal load bearing walls Allied READY Floor concrete can be used to replace the conventional steel reinforcing used in NZS3604. The dimension of the foundations must be as described in NZS3604 clause 184.108.40.206 and for the slab thickening clause 7.5.11.
- Lower footing D12 should be positioned mid footing on a 75mm (minimum) bar chair. Upper foundation D12 can be suspended on wire 50mm (minimum) cover from side and top surface.
- Concrete minimum strength must meet the requirement of NZS3604 C220.127.116.11 fir residential floor construction.
- The slab and foundation should be poured monolithically, as shown above.
- It is recommended that the first saw cut is located a maximum of three meters out from the foundation edge and the first free joint is a maximum of 12 meters from this edge (when slab is over 24m in length).
- It is important to accommodate the additional stresses brought about by restraint when slabs are tied into the perimeter foundation. Edge restraint will almost certainly guarantee cracks developing unless the bay is divided at least in two in both directions. Early entry saws can be used on concrete that is only a couple of hours old. Leaving the cutting by two hours or more is risking uncontrolled cracking. Should this occur, subsequent cuts will be rendered ineffective by these predominant early age cracks.