CHOOSING METAL BUILDINGS

Metal building kits are pre-cut, pre-drilled, pre-welded, and ready for assembly. Large and small buildings can come this way. Smaller building kits for metal garage buildings, or smaller metal sheds and carports,  are suitable for homeowners or small business owners to erect themselves. Before site preparations are made, the building supplier should be chosen. It is a great help to the whole process if a simple pencil sketch is laid out. Then it can be presented to several different companies. Foundation and site requirements should be detailed by the supplier.

Before the metal building kit arrives, it is best to have all of the job site work done. It is not good for a package to sit on pallets or skids waiting to be erected. When the delivery arrives, work should commence shortly>

FOOTER AND SITE WORK

Metal buildings can be erected on gravel, dirt, or cement pads. Footers must be dug and the appropriate amount of cement poured into the holes. Many times anchor bolts are set into the cement so that the building can be attached to them. If pouring a cement pad for the floor of the building, the pad is usually poured after the footers are complete. A 4″ thick pad  of gravel should be spread evenly across the floor area. Then the pad is poured on top.

When the semi arrives with a package most likely a machine of some sort will have to be on site to unload. Semis do not usually carry their own means to unload, so this is a homeowner or general contractor expense. Depending on how heavy the bundles are, it can be unloaded with a sky lift, extend a boom, or a crane. Some kits are light enough that a fork lift can do the job. But the supplier should be asked ahead of delivery how much the heaviest bundle or piece weighs.

METAL BUILDING CONTRUCTION

OK, now forthe metal building construction. Each piece of the building is inventoried, then the superstructure starts. The piers are lifted and bolted at the bottom to the footers. Then the metal trusses are bolted together and lifted. Once in place they are bolted to the top of the piers. For some smaller buildings the truss may be on piece and simply bolted to the top of the piers on each side. For large span buildings, the truss itself is bolted together at the peak, lifted into place with the crane, and then bolted to the top of the piers.

Then the other metal purlins and components to the superstructure are lifted into place and bolted to the framework. Like a huge erector set, the building begins to take shape.

Once the superstructure is completed, the metal sides are installed. Any cutting for door and window openings are cut in at this point. Some times metal is already cut and ready to be just screwed up. The building that I helped with, there was some cutting required on most of the pieces.

Next the roof sheeting is screwed into place. For both the siding and the roof all of the screws were supplied with the building kit. The screws were self tapping, and a rubber or vinyl ring at the base of them, and the heads were painted to match the outside color of the steel building.

After the metal siding and roofing is  installed the doors and windows are installed.

All in all the metal building kits are easy to assemble, reasonable on time requirements for erection, and required little cutting (only on the siding and metal roofing).

Metal Buildings are very widely accepted today. One major area of use is commercial buildings. Commercial would include industrial buildings, civic centers, gymnasiums, indoor horse riding arenas, metal storage buildings, churches, and agricultural buildings, to name just a few.

Metal buildings are capable of very wide spans with vaulted ceilings. Clear span is vital to indoor horse arenas and some industrial buildings. Also the vaulted ceiling on the inside allows for higher clearance in factories and gymnasiums. Wood truss buildings have a higher roof line on the outside, but a flat ceiling on the inside. This does not allow for as much openness. In a church or horse arena a vaulted ceiling gives a much more open feel to the metal building.

During metal building construction, the super structure of the metal building is bolted together. The piers are erected, then the main trusses are bolted together, and then lifted with a crane, and bolted to the top of the piers. This construction is less susceptible to wind damage before it is covered in metal sheeting than a wood truss building. The wood trusses have a very high peak, especially when the building has a wide clear span. A strong wind can come up and push the trusses before they are protected with the sheeting. Several years ago a 100′x200′ indoor riding arena had all but two of the trusses set. Even though they were braced, a strong wind came up and made match sticks out of the building. In the end the construction insurance only covered approximately $6,000 of the total damage. Not to say that a steel building is invincible, but the strong superstructure that is bolted together with a lower roof line is something to really think about.

Wood buildings are a viable option for many sorts of construction, but they do cost more than the metal, require more maintenance, and also attract insects. Also during construction there is much more waste from a wood building. When purchasing a metal building, typically the only thing that has to be cut on site is the metal roof and side sheeting. The metal is recyclable, so the little waste that does accumulate is easily taken to the scrap yard.

A large building is similar to a balloon when the wind comes up. The force puts outward pressure on the whole structure. This tendency is called, “uplift”. This uplift affects everything from the footers, to the superstructure to the walls. Footers and piers may need extra strength added to them to counteract the uplift. Also metal siding and roofing must be installed with the appropriate self tapping screws with rubber or vinyl rings. This keeps the siding from popping of off the structure. This is one topic that should be looked into before a building is purchased. The structural engineer with the company supplying the building should address this in the plans.

Any time that hoists, cranes, conveyor belts, or rigging is going to be affixed to the superstructure it must be compensated for in the drawings before the building is erected. Buildings are designed for things like snow load in a particular area. Added strain on the framework could result in damaging or destroying the building. Be sure to consider exactly what a facility will require and then relay that to the structural engineer. The engineer must know exactly what the building will be expected to handle before it designed.