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Please note: This third edition of TR34, published in 2003, has now been superseded by the fourth edition published in August 2013.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.

Superseded

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

For all classifications , all points surveyed should be within 15 mm from datum.

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.

Superseded