Eliminate Hot Works Permits

When using Dura Tread fibreglass grating for risers, hot works permits are not necessary. All service apertures can easily be cut on site, in situ, using a cordless Jigsaw.

 

The cut-outs can be securely attached to the main riser material (using wire or cable ties) which safeguards the possibility of the cut-out falling.

 

When plasma cutting apertures for service pipe work in steel risers it is usual practice to introduce Hot Works Permits which create excessive down time and Health and Safety issues.

 

European 15mm Ball Test

 

Dura Tread fibreglass risers can be supplied with mesh sizes of 42mm x 42mm, 38mm x 38mm, 32mm x 32mm, 12mm x 12mm and 8mm x 8mm.

 

The smaller openings prevent small objects from falling through the mesh and complies with the European 15mm ball falling test requirements. The riser mesh also allows natural ventilation to take place.

 

Solid top risers are also available should ventilation not be required.

 

Fire Resistance

 

Fibreglass risers are also available to meet fire resistance complying with B.S. 476 Part 7 Class 1 and Class O. Details are available on request.

 

Anti Slip Surface

 

The gritted anti slip texture has one of the highest degrees of slip resistance ever measured for a walking surface.

 

Angular Quartz is integrally bonded to the top surface, which produces an extremely long-lasting hardwearing surface.

 

High Strength & Lightweight

 

Dura Tread risers are lightweight, chemical-resistant, non-conductive, non-slip, impact and fire resistant, and unlike metal grating will not rust, and never needs painting. Three top surface finishes are available; gritted for maximum anti-slip properties; concave surface for anti-slip and smooth for special purposes. Dura Tread risers is an ideal substitute or replacement for stainless steel, aluminium and galvanised steel risers.

 

Benefits

 

• Anti-slip surface
• Lightweight
• Fire resistant
• corrosion resistant
• Non-magnetic
• Impact resistant
• Maintenance free
• Attractive design

 

Dura Tread Fibreglass Risers Eliminates Hot Works Permits

Steel frames fixed within the slab to form riser shafts and the decked with Dura Tread

 

Service apertures can be cut out on site Using a cordless Jigsaw.

 

 

Lift Risers

 

Dura Tread fibreglass riser grating lift risers have been used on the Ravensbourne College project. Installed as early as possible following formwork removal, the Dura Tread risers form part of the general floor plate.

 

The mesh size (12mm) of the lift riser grating ensures that additional ply covering are not required. In addition, service penetrations can be cut into the riser grating in the permanent location.

 

The project made the decision to use Dura Tread grating for the service risers based on the
information from the supplier and experience from new BLL contracts.

 

Riser Decking

 

The main benefits of Dura Tread riser decking are as follows:

 

• Can be installed prior to removing the formwork from below eliminating the risk of falls.
  
• Fits within rebate to top edge of riser opening therefore maintaining full size of opening for
  rising services and finishes flush with slab for ease of bracket installation.
  
• Service holes can be progressively cut easily with standard cordless jigsaw
  
• Small aperture size of grating prevents objects falling through.
  
• Lightweight, anti slip.

 

Installation Sequence

 

1) Dura Tread panel factory cut into size of riser opening and delivered to site.
2) 40mm deep by 50mm wide rebate cast in top edge of concrete to locate into.

 

 

3) Fixed immediately into place following striking of formwork.

 

 

4) Screw & washer fixed into position at each corner to prevent removal of Dura Tread riser.

5) Services contractor to mark out cut required.
6) Intermediate supports (steel) fixed to under side of Dura Tread if the above requirements
create a risk that the surface area will be reduced too much by services penetrations. Supports
to be fixed in place prior to any cuts to Dura Tread riser.
7) Services openings cut with jigsaw, circular saw or angle grinder with metal cutting blade.

 

 

Loading Information

 

 

Riser Floor Scenarios

 

Builderswork Holes within the Riser

 

Scenario 1 - Single Builderswork Hole within Riser- Criteria for Maximum Hole Size

 

G must be greater than 300mm or greater than the half the width of the builders work hole.
I must be greater than 150mm or greater than half the depth of the builders work hole.

 

If a situation occurs where it is not possible for enough material to be left in place once services holes have been cut, entirely remove the section shaded in yellow OR

 

If this results in the width of I being less than 150mm unistrut (designed by a structural
engineer) should be installed to support dura tread from underneath.

 

Scenario 2 - Multiple Builderswork Holes & Minimum Spacing Requirements

 

 

Minimum Value of Left Material:

 

The minimum amount of dura tread left between two builders work holes must be greater than 100mm. If the residual amount of dura tread left after cutting the holes is less than 100mm, it should be removed (shaded area above).

 

 

Scenario 3 - Multiple Builders Work Holes where Additional Support is Required

 

 

This situation has 2 problems:

 

The yellow shaded areas are less that 100mm wide and therefore they are not safe to stand on.

 

If the areas are removed they will create a cantilever situation and areas F & G will fall out.

 

Unistrut/ steel underneath the dura tread grating (designed by a structural engineer) bracketed onto riser walls will allow Scenario 3 to be achieved safely and the yellow shaded areas can
be left in place (see scenario 3A.)

 

Scenario 3A - Arrangement of Additional Support

 

 

Scenario 4 - Support of Dura Tread Riser Panel Joints

 

Risers greater than 1220mm wide:

 

When a riser is wider than the panel width a supporting beam (designed by a structural
engineer) must be fixed underneath where the panels join. Bearing surface must have an
overall width of 100mm. This will allow enough flange width to fix down through.

 

In the above case, position AA or BB can be used for the reinforcement beam. Position AA in this case is preferable.

 

 

Scenario 5 - Minimum Spacing Between Adjacent Builders Work Holes

 

 

Material in between small services holes that is less than 100mm wide should be removed,
unless the holes are less than 60mm diameter.

 

Scenario 6 - Arrangement of Multiple Builderswork Holes Requiring Additional Support

 

 

Where a large number of cut outs are required in a riser, a premade frame (designed by a
structural engineer) should be supplied to support the Dura Tread This frame should be
installed prior to any holes being cut out.

 

It may be easier to completely remove a larger area of Dura Tread (see scenario 8A) and
barrier off.

 

Scenario 6 A