The QF2 Fire Protection Compound may be used in rigid walls and floors. QF2 is readily mixed with water in a bucket or concrete mixer, to consistencies that range from pourable, stiff or suitable to be trowelled.
QF2 can be used in conjunction with other QuelStop system products such as the QWW and QuelCoil Intuwraps and the QWR fire collar.
QF2 Fire Protection Compound expands slightly on curing (0.1%), to form a rigid seal and will provide a load bearing seal at 100mm thick.
The setting time for QF2 depends on the atmospheric temperature. It may be built up further within two or three hours where large barriers are required.
Vertical openings through floors:
It is recommended that appropriate shuttering such as MW Mineral Wool Slabs should be cut to suit the penetration slightly oversize and around all penetrating services so when installed it will be a good friction fit.
The MW Slab should be positioned towards the bottom of the hole to allow the correct depth of the QF2 Fire Protection Compound to be installed on top – normally a minimum of 100mm but this should be checked in accordance with the test evidence and recommendations.
Consideration should be given to any necessary temporary or permanent support that may also be required.
Once the MW Shuttering Slab is securely fitted, any necessary closure devices required around the service penetrations such as QWW Intuwraps to plastic pipes may be installed.
The QF2 Fire Protection Compound can then be poured on top of the MW Shuttering Slab.
Once the QF2 Fire Protection Compound has cured, the shuttering can be removed so that the fire seal is visible. If retained, we recommend that the shuttering is at least cut back around the service so that the fire seal is visible and exposed to fire. All combustible materials such as plywood, must be removed, after the QF2 Fire Protection Compound has set.
Where the barrier is required to provide a load bearing capability, consideration should be given to structural support, such as reinforcing bars. Consideration may also be given to the use of a permanent shuttering system. In all loadbearing situations the QF2 Fire Protection compound thickness must be at least 100mm.
As the load bearing performance particularly in un-reinforced situations is dependent on compressive membrane action against the concrete slab edge or other rigid boundary, it is essential to check that this is vertical, before commencing installation.
Where the thickness of the seal is built up using multi layers, the structural strength of the seal may be reduced. It is therefore recommended, particularly in load bearing situations, that a maximum of 10% thickness is installed initially, and the remaining thickness applied as a further single operation.
Building up the seal in several operations with the individual layers being allowed to set, will result in a weak laminated structure with severely reduced load bearing performance.
Cutting out part of the finished seal to accommodate additional services, must not be undertaken without review by a competent person, of the effect on the structural integrity of the seal and also to ensure that the seal will still fall within the tested scope of application.
Horizontal Openings through walls:
It is recommended that the QF2 Fire Compound should be installed to a minimum thickness of 100mm. The QF2 Fire Protection Compound may be pre-cast into convenient sized blocks with a stiff mix being used as a bedding mortar or the QF2 Fire Protection Compound can be plastered onto a MW shuttering slab to the required depth.