1. What are the design restrictions for mezzanine floors?
There are no size, shape, number of floor levels or height restrictions as we offer an extensive range of floor loading options to suit most applications (all subject to local site conditions).
2. How long does the mezzanine floor installation process take from order to completion? Typically as follows;
Week 1: Detailed site survey further to receipt of your order.
Week 2: Design and production of general arrangement (GA) drawing.
Week 3: Client approval of GA so enabling our generating of structural calculations. Submit Building Regulations.
Week 3-7: Submit & await Building Regulations approvals.
Weeks 8-12: Structural steel manufacture.
Week 12: Mezzanine installation commences on site (duration related to extent of works).
*Note: If authorized to proceed in advance of Local Authority approval then overall timescale reduced to typically 4 weeks.
Footings – USI does not determine if the existing slab can carry the loads imposed by a new mezzanine or if new footings are required. We can assist the process by getting the loading information to an engineer of your choice for review.
Ladder Cages – OSHA does not require a ladder to have a cage until 20' top of deck. Many customers will add the optional cage at lower elevations, but it is not required.
Safety Gates – Yes, Steele Solutions offers several different types of safety gates. Contact us for the right gate for your application.
Decking Types – First you must consider the application. Here are key questions you should ask yourself to determine what type of decking is best for your work platform application:
- How is the structure being used?
- What is going on top?
- How is the material being moved or stored?
- Is it a wet environment?
- Is there an office being built on top?
- Are there any budget concerns the end-user is facing?
Bar Grating – Bar grating is a common decking surface for mezzanines, platforms, catwalks and conveyor systems. Welded steel bar grating offers strength and reliability, with the added advantage of allowing light and air to pass through. With only one deck layer to install, it can result in quicker installation times.
In most cases, roof deck and wood will be more economical, and in most mezzanine applications sprinklers are required by insurance carriers and building departments.
Stair Space – One of the questions we get asked most frequently by distributor sales regards how much floor space will the stair take up. You can come close with a stair run calculation using the following approaches.
Horizontal run is equal to 1.25 x deck height.
Example: 10' mezzanine deck height = Approx. 12' - 6" horizontal run
Horizontal run is 1.61 x your deck height (does not include handrail extensions or any landings).
Example: 10’ mezzanine deck height = Approx. 16' - 1" horizontal run
Other Stair Considerations
IBC stairways with a deck height above 12’ must have an intermediate landing. If the stairway has an intermediate and/or top landing, that must be factored into the horizontal run. Typical landings are 4’ square.
Stair Landings – Any mezzanine with a top of deck over 12'0" requires an intermediate landing. In addition, intermediate landings can be used to create a L-Shaped or U-Shaped stair design at any height on a mezzanine.
Number of Staircases – There are many factors required to determine the number of stairs required (size, use and occupant load of the mezzanine, location in building, etc) but a safe rule of thumb would be to be within 75 feet of a stairway from any point on a mezzanine.
PSF – PSF is the abbreviation for pounds per square foot. This PSF is used as the design load or uniform load for mezzanines and other steel structures. Per Table 1607.1 of IBC Code, the minimum design load for mezzanines or work platforms is 125 PSF. We can design for loads much higher than 125 PSF however very few applications require a larger uniform load.
For example, a 50' x 50' mezzanine with a 125 PSF rating can handle 312,500 pounds! That is the equivalent of 208 pallets weighing an average of 1,500 lbs. (which would not even fit on the mezzanine).
Keep in mind that the design load in PSF is an average loading over the entire deck surface, rather than a heavy load in one area only. For example, a 250-lb. man working on the platform would not require a design load of 250 PSF.
Understanding the difference between a design load (calculated in PSF) and a point load (calculated in pounds) is critical to a safe and economical design.
Clear Height – Per IBC 2009 Section 505.1 the minimum clear height under a mezzanine is 7'0" (84"). The same minimum clear is required from the top of mezzanine deck to the ceiling above.
Span Lengths – The longer you span the deeper the profile of the steel needs to be. Longer spans can lead to a higher cost for the mezzanine. The most economical would typically include column spacing where spans in both directions are under 20'0" long.
PE Stamped Prints – US Industrial can be stamped by a PE in all 50 states and beyond.