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Slabline Ltd

Throughout the years, we’ve firmly established ourselves as leaders in the concrete slabs industry.


Drawing call-up
To specify the TASS system on your drawings, we suggest you use the following
designation: TASS slab depth
For example, if the project is to be made from 200 thk slab
with a 75mm topping, then the specification would read:
TASS 125 block at 600c/c with 75mm topping (200mm o/a)

TASS system in general complies with the following standards:

(0) BS 8110
(i) AS/NZS 2327: ‘Composite structures
(ii) NZS 3101: ‘Concrete Structures Standard Part 1 & 2’
(iii) NZS 3109: ‘Concrete Construction’
(iv) NZS 3404.1 & 2: ‘Steel structures
(v) AS/NZS 4671: ‘Steel Reinforcing Materials’


TASS has been designed utilizing the most up to date design standards including: BS 8110,
AS/NZS 4600 Cold formed structures code AS/NZS 2327: Composite Concrete structure
(i) The design of TASS shall be in accordance with the requirements and recommendations of NZS 3101:2006 ‘Concrete Structures Standard Part 1 & 2’ and/or any recognised international Standard or part thereof, for– BS 8110, SABS 10100, B810, UBC &ACI, of Concrete’.
(ii) The TASS slabs shall be designed for exposure classification A1/A2/B2 as per table 3.6 in NZS 3101
(iii) The TASS unit shall have a FRR (Fire Resisting Rating) of 90/90/90. Penetrations through the flooring system shall be reinstated to the required FRR by an approved fire protection system.
(iv) TASS shall be designed to have a maximum crack width of 0.3mm under full live load conditions.
(vi) The acoustic STC (Sound Transmission Class) and IIC rating of the floor system shall meet or exceed 52dB as tested at a registered institution or a field test of 50dB measured in ‘on-site conditions’. These ratings apply to the finished floor system, including any carpeting and suspended ceiling systems.
(vii) The TASS channels shall have a minimum of 75mm end seating or L/180, whichever is greater, as per clause 18.74 in NZS 3101 plus tolerance of 15mm if seated on an unarmoured concrete beam.


(i) Concrete shall be specifically mixed depending on environmental conditions and should have a 28-day cylinder strength of 25MPa as a minimum.


(i) TASS ribs are 150x65x20x 1mm G550 /Z275 galvanised.
(ii) TASS blocks are moulded from 24g/ltr & 28g/ltr EPS Block Heights: 125mm, 175mm, 225mm, mm, 275mm, 350mm, x 450mm wide x 800mm long.
(ii) Reinforcing steel is Grade 500 Mpa & Seismic mesh

Temporary propping:

(i) Design of temporary propping, back propping, bracing systems and ground conditions to support prop loads shall be carried out by a
suitably qualified Engineer.
(ii) Propping shall not be removed until the topping concrete has reached at least 70% of the 28-day strength.
(iii) It is the Contractor’s responsibility to ensure the propping system used on site meets the criteria as detailed in the aforementioned design
and any additional requirements shown on the TASS /Engineers drawings.
(iv) All proposed systems with supporting calculations shall be submitted to the Specifying Engineer prior to erection on site for approval.

Topping concrete:

(i) The top surface, Slab dry materials shall be clean and free of all dust, oil or any deleterious substances which may adversely affect
the wet topping bond to the TASS system.
(ii) Free water shall be cleared away before the topping is applied.
(iv) Topping reinforcement shall be laid and supported to the Specifying Engineer’s requirements and shall be supported to prevent displacement during concreting.
(v) Topping concrete shall have a maximum aggregate size of 13mm and a 28-day strength of 25Mpoa min and be well compacted with mechanical vibrators.
(vi) Topping concrete shall be poured to a true surface so that the specified thickness of minimum of 75mm is achieved at the centre of the span.
(vii) In-situ concrete shall be cured by the application of an approved curing membrane or by being kept continuously wet for not less than
5 days

Fixings & penetrations:

(i) Fixing to the TASS ribs shall be in accordance with approved details only and shall not impair or reduce the strength of
the beam in any way.
(ii) Documentation of tested fixings proposed for the project shall be submitted to the Specifying Engineer prior to installation.
(iii) Penetrations, set downs or chases to the TASS system or topping concrete shall be in accordance with the details agreed by the
Specifying Engineer prior to any work being undertaken on site.