The Concrete Society’s TR34 Free Movement (3rd Edition) Classifications
Please note: This third edition of TR34, published in 2003, has now been superseded by the fourth edition published in August 2013. The third edition may still be cited in contract specifications.
Click here if you would like to view the latest specification – TR34 4th Edition.
Table 4.2: Permissible limits on Properties II and IV in free-movement areas.
| Floor Classification | Typical floor use | Property II limit (mm) |
Property IV limit (mm) |
||
|---|---|---|---|---|---|
| 95% | 100% | 95% | 100% | ||
| FM 1 | Where very high standards of flatness and levelness are required. Floors to FM 1 classification may need to be constructed using long strip methods. See Section 2.2.3. |
2.5 | 4.0 | 4.5 | 7.0 |
| FM 2 | Buildings containing wide aisle racking with stacking or racking over 8 m high, free-movement areas and transfer areas | 3.5 | 5.5 | 8.0 | 12.0 |
| FM 3 | Buildings containing wide aisle racking with stacking or racking up to 8 m high.
Retail and manufacturing facilities |
5.0 | 7.5 | 10.0 | 15.0 |
In assessing the surface regularity of free-movement areas, a sample of points on the floor is surveyed, as it is not practical to survey the infinite number of combinations of points on the floor. Unlike in defined-movement areas, it is not necessary to control every point with precision as MHE is generally operating with loads at low level and there is minimal risk of collision with storage racking at high level as a result of the floor being uneven.
Data analysis and permissible limits
The survey data is analysed and compared with the permissible limits for Properties II and IV given in Table 4.2.
In speculative construction, the developer is advised to build to as high a standard as possible. Surface regularity specification FM 2 (Special), see Table 4.4, is suggested to reduce the amount of grinding required for Category 1 use once the defined-movement areas have been defined.
Table 4.4: Permissible limits on Properties II and IV in floors for possible conversion to Category 1.
| Floor Classification | Floor use | Property II limit (mm) |
Property IV limit (mm) |
||
|---|---|---|---|---|---|
| 95% | 100% | 95% | 100% | ||
| FM 2 (Special) |
Floor for possible conversion to Category 1 defined movement | 3.0 | 4.5 | 6.5 | 10.0 |
The floor is non-compliant if:
- more than 5% of the total number of measurements exceed the 95% property limit
- any measurement exceeds the 100% property limit, and
- any point on the Property IV survey grid is outside ± 15 mm of datum.
Related Documents
- Click Here To Download TR34 3rd Edition Further Explanatory Information
- Click Here To Download Table 4.2 & 4.4
Property IV
Measuring Property IV (and Datum check) using an Optical Level and Parallel Plate Micrometer, taking readings from an Invar Staff to 0.1mm.
Measurement Standards
TR34 4th Edition
The Concrete Society’s TR34 Free Movement (4th Edition) Classifications
(Current Version)
Surface Regularity
can be checked to ‘BS 8204-2:2003+A2:2011’ straight edge specifications SR1, SR2 and SR3
TR34 3rd Edition
The Concrete Society’s TR34 Free Movement (3rd Edition) Classifications
(Previous Version)*
