Tag: Fire Alarm Panel

We were asked to look at this project in Salisbury for Dauwalders. They were looking to take on two units next to each other, but one needed to be an office. The obvious location for an office was on an existing mezzanine floor, which would allow a work area underneath, and separation from the main warehouse floor.

A nice new unit, nothing had ever been built in it, however we could hear absolutely everything from next door due to the way the mezzanine floor had been built. We certainly needed to minimise this as much as we could without going over board with it.

The unusual way the mezzanine floor had been built, was that the floor did not actually go right up to each of the walls leaving a gap. Clearly we had to box this, and make it safe for the people working in the space.

The requirements were around 4 people in the office upstairs, with power points downstairs for benches, and the downstairs space needed a pair of double doors on it. The next door unit had to be knocked into, with a fire alarm fitted to cover both units, and this was fitted for us by the Fire Alarm Consultancy, which we recommend on all our projects.

There was some stipulation with dates, and that allowed Dauwalders to plan on what to move where and all of that was fine.

The other fairly obvious item that needed to be considered was Building Regulations, particularly as there are people working on a mezzanine floor. The rules are that if people are working on a mezzanine, they need to have enough time to get out of the building in the event of a problem. The structure therefore has to be fire rated, to ensure it does not collapse, and the escape routes need to be clear, protected if required, with emergency lighting, fire alarm detection etc.

In this particular case, the travel distances to get out were not massive, and if we positioned the stairs where required, the exit is straight to a fire exit, as well as into a protected space underneath with an exit, as well as the roller shutter, and potentially into the other unit. Plenty of ways to get out.

The main stipulation from the Fire Inspector is to make sure that the mezzanine floor itself is fully 60 minutes protected. There was no stipulation on the walls, but we would normally fit 30 minutes anyway, and the Inspector was happy with that.

All of the steels therefore had to be boxed in 15mm fireline board, which is the pink board in the photographs below.

We always draw everything anyway, but these drawings needed a bit more detail for the Inspector to be clear about what was going on. The offices needed fresh air ventilation, and this is done with a VAM unit. They had air conditioning which provided heating and cooling, but in Building Regulations there is no requirement for air conditioning, just a means of heating the space, which an electric radiator would have been fine. There is a definite requirement for fresh air ventilation.

This was always going to be tricky. Even as we stood on the mezzanine floor before we did any work at all, you could hear everything. Part of the issue was the really bad design of the mezzanine floor. They had designed it so that the main floor ran through all of the units, right the way through, then plonked the dividing walls on top of the floor to split up the units. Any noise translating into vibration just carries on through any metalwork. There were also huge gaps between the edge of the floor and the outside of the building, any noise was going to go straight up through these gaps to the upper floors. Even though the noise next door was downstairs, in their unit it was going straight up and through the gaps.

In our unit, we can deal with the gaps at the edges, but really it needed RWA45 acoustic slab in the walls, and sound block board to try and absorb noise coming through, and then block it coming into the potential new office upstairs. It also needed decent suspended ceilings with bagged 200mm insulation over the suspended ceiling grid and that was probably as much we could do.

Please find below some construction photos. We needed to ensure that the mezzanine floor was 1 hour fire protected and as mentioned previously, we carried this out using 15mm fireline board, boxing all of the columns and the edges of the mezzanine floor.

We also had to build over the gaps at the edges of the mezzanine, to ensure any potential fire did not go up between the floors.

If you are thinking of taking on a new unit, and have any questions, we would love to be involved in your project, the visit is always free and the advice is free as well. If you are not sure what is involved you are not sure on how things can be done, then we are sure we can help.

Please call 01380 73 8844 or email us via the contact form on this website, or at [email protected]