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Tuffloor is particularly suited for use with reactive soils, and sloping sites, and can be installed in remote locations without the need for cartage of extensive installation infrastructure. Offering economical spanning performance, Stratco Tuffloor is adaptable to a variety of building designs and construction methods.

Economy

All major structural components are made from high tensile steel providing strength and impact resistance. The efficient strength to weight ratio of high tensile steel minimizes the weight of materials needed to be transported to site, saving money in remote locations. With the increased load bearing capacity of the Tuffloor system, smaller sections can be used, contributing to cost efficiency. When this is combined with in-line construction, the total height of the building can be reduced, further saving brick and cladding costs. Keeping project costs under control is always a challenge on any building project and choosing Tuffloor for your project just makes a lot of sense.

Versatility

Stratco Tuffloor Flooring complies with the static and dynamic response requirements imposed by AS 3623 - Domestic Metal Framing. The maximum serviceability deflection of the floor is limited to L/360 but kept to less than a maximum of 12mm.

235mm sections allow for 115mm pipe penetrations and toilet bends under the floor, and standard joist spacings compatible with a large variety of flooring materials.

Durability

The galvanised coating offers long term protection against corrosion. As the subfloor is made from steel it is not subject to twisting or warping. Other benefits include termite protection, mould resistance and elimination of wood rot.

Design Information

Stratco Tuffloor flooring conforms with the following Australian standards:

• AS 4100:1998 Steel Structures.
• AS/NZS 4600:1996 Cold-formed Steel Structures.
• AS/NZS 1170:2002 Structural Design Actions.
• AS 3623:1993 Domestic Metal Framing.

The following design loads are used in the determination of the span tables:

 Floor loads:

• 2.0 kPa, live load.
• 0.6 kPa, dead load.
• 1.8 kN, concentrated load.

Roof loads:

• 0.9 kPa dead load for a tiled roof.
• 0.3 kPa dead load for a steel roof.
• 0.25 kPa live load.

Wall loads:

• 0.8 kN/m dead load

Design Criteria

The Roof Load Width is the effective width of roof that the bearer is supporting.
Figure 1. 0 shows a simplified method for determining the Roof Load Width.

Joists

Joist members are to be simply supported between bearers and should be used with bearers of the same depth. Spans for joist spacings less than 450mm should be based on 450mm.

Joists Not Supporting a Roof Load
Maximum Joist Span mm - Not Supporting Load Bearing Walls
Joist	Joist Spacing
	450mm	600mm
FJO18212	3300	2750
FJO18215	3750	3600
FJO18219	4350	4000
FJO18224	4550	4250
FJO23515	4700	4400
FJO23519	5400	5200
FJO23524	5500	5400
Interpolation may be used for intermediate values

Joists Supporting a Roof Load
Maximum Joist Span mm - Supporting Load Bearing Walls
Joist	Steel Roof	Tiled Roof
FJO18212	2250	1850
FJO18215	2450	2100
FJO18219	2650	2150
FJO18224	2900	2400
FJO23515	3000	2650
FJO23519	3350	2750
FJO23524	3650	3000
Max 450mm joist spacing, where load bearing walls are not parallel to joists. Note: These span tables must be read in conjunction with the Stratco Tuffloor Design Guide.

Bearers

Bearers are used to transfer the loads from the floor and roof into the floor support system. Only bearers are permitted to be attached to the floor support system. NOTE: These spans must be used in conjunction with the Stratco Tuffloor Design Guide.

Bearers Not Supporting a Roof Load
Joist Span mm	Max Internal & Perimeter Bearer Span mm
	Not supporting load bearing walls or fixed to joists supporting load bearing walls
	FBE18219	FBE18224	FBE23519	FBE23524
0	4350	4550	5400	5500
1200	3380	3650	4250	4650
1800	2950	3200	3700	4050
2400	2650	2700	3350	3700
3000	2450	2550	3100	3400
3600	2300	2400	2950	3200
4200	2200	2300	2800	3050
4800	2100	2200	2650	2900
5400	-	-	2550	2800
6000	-	-	2450	2700
Interpolation may be used for intermediate values

Bearers Supporting a Steel Roof
Maximum Internal & Perimeter Bearer Span mm
Supporting load bearing walls or fixed to joists supporting load bearing walls
Joist Span mm	FBE18224 Roof Load Width mm			FBE23524 Roof Load Width mm
	4000	6000	8000	4000	6000	8000
0	3400	3100	2900	4300	3900	3650
2400	2900	2800	2650	3700	3550	3350
3000	2700	2700	2600	3400	3400	3300
3600	2550	2550	2550	3200	3200	3200
4200	2400	2400	2400	3050	3050	3050
4800	2300	2300	2300	2900	2900	2900
5400	-	-	-	2800	2800	2800
6000	-	-	-	2700	2700	2700
Interpolation may be used for intermediate values

Bearers Supporting a Tiled Roof
Maximum Internal & Perimeter Bearer Span mm
Supporting load bearing walls or fixed to joists supporting load bearing walls
Joist Span mm	FBE18224 Roof Load Width mm			FBE23524 Roof Load Width mm
	4000	6000	8000	4000	6000	8000
0	2900	2600	2400	3650	3250	3000
2400	2650	2450	2250	3350	3100	2850
3000	2600	2400	2250	3300	3050	2850
3600	2550	2350	2200	3200	3000	2800
4200	2400	2350	2200	3050	2950	2700
4800	2300	2300	2150	2900	2850	2650
5400	-	-	-	2800	2750	2600
6000	-	-	-	2700	2700	2500
Interpolation may be used for intermediate values

Connections

Joists - Joists should be fixed to the bearers using one of the methods shown below.


Bearers - Stratco can supply column caps and base plates to suit 65, 75 and 100mm SHS steel columns.


For more information on Tuffloor design specifications and connection details, please refer to the Stratco Tuffloor installation and design guides.