Can I use a fire collar on a hollow core slab? Penetration sealing

Whilst it is logical to consider a hollow core concrete slab as similar to a traditional reinforced concrete floor, manufacturers of hollow core slabs have very strict requirements around the use of mechanical fixings which can potentially affect the structural integrity of the slab.

On this basis, Quelfire have carried out specific testing with hollow core slabs using non-mechanical fixing solutions, therefore we would not recommend the use of a fire collar.

Planning and coordination is critical as the internal hollow cores themselves require sealing as well as the actual penetration so a slightly bigger hole is generally required than that for a standard fire collar in order to allow the installer to insert the materials required.

The maximum size plastic pipes tested are 110mm diameter and the maximum permitted hole is 240mm diameter, refer to the following installation details for full specification:

  • QF2-HC150-06 – Utilising Quelfire QF2 Fire Protection Compound, shuttering slab along with the QuelCoil Intuwrap – click here for details.
  • QB-CF150-D-06 – Utilising QuelStop Fire Batt and Intumescent Acrylic Sealant along with the QuelCoil Intuwrap – click here for details.

As always, any further questions should be directed to technical@quelfire.co.uk