The main difference is that a roll-up door is made of continuous steel sheeting and an overhead door consists of hollow aluminum segments filled with insulating PUR foam. This means that with an insulated storage building only an overhead door is possible. With an non-insulated storage building you choose from both.
Features overhead door:
+ Makes less noise
+ Burglary resistant: can only be opened manually from the inside
+ In the event of damage, only the damaged element needs to be replaced
+ Opens complete, so full height to use
– Can not be opened from outside (except with a remote control)
– More expensive
– The overhead door hangs horizontally in the indoor area, so that the working height in the storage building cannot be fully used
Features roll-up door:
+ More efficient use of interior space because the door rolls up above the door opening
+ Can be opened from outside
– Less clearance (approx. 10 cm) because the lower beam (with the handle) hangs in the doorway
The transport volume of an insulated storage building is 3 to 4 times greater than that of a non-insulated storage building. The insulated sheeting is 4 cm thick, that of non-insulated sheeting is only 0.4 mm thick. The skylight panels of an insulated storage building are also much thicker than those of a non-insulated storage building. The insulated storage building has an insulated overhead door as standard. This door takes up much more volume than the standard roll-up door of an uninsulated storage building. Due to the larger volume, we cannot combine the transport of the warehouse with the transport of other products. This means that we must arrange transport for just one address. As a rule, this is always more expensive than a combined transport.
All our storage buildings can be extended indefinitely with a multiple of 3.0 (E500 storage buildings), 2.7 (H600, H700h and H800h storage buildings) or 3.7 meters (H900(h) storage buildings). The E500 and H900(h) storage buildings can easily be adjusted to the desired size during assembly by shortening all horizontal parts between the last two frames. The shortest length can also be shortened in this way. The H600, H700h and H800h series storage buildings cannot be shortened.
The width of the storage building cannot be increased or decreased.How are these storage buildings anchored?
Kroftman storage buildings can always be placed without a foundation. This distinctive advantage allows you to achieve huge savings on the overall project costs. This allows one to place a storage building much more quickly and inexpensively. The storage building can also be placed on Stelcon® sheets, asphalt, pavement and even on compacted earth, gravel or rubble.
Have a look at our special page about the anchoring options.How do I install a roll-up or an overhead door?
It is relatively easy to install a roll-up or an overhead door. Check the installation videos.
Installation video for a Janus roll-up door (only applicable for non-insulated storage buildings)
Installation video for a Novoferm (Alpha) T450 overhead door for the front or back wall
Installation video for a Novoferm (Alpha) T240 overhead door for the side wall
Can I insulate a non-insulated storage building?
If you wish to reduce extreme temperatures or condensation you can insulate your building yourself. This is done by installing common insulating panels (such as sandwich panels, Polystyrene, EPS, PIR, Styrodur®, Isover® or Fastfixx®) tightly between the truss tubes. The seams should be sealed with insulation tape or caulking. Ideally the insulation panel thickness should equal the depth of the tubes; 75mm or 50mm. (see construction drawings) Due to the remaining thermal bridges and uninsulated roll-up door/skylights these buildings are less suitable for full heating. Please be aware that the maximum snow load allowance should be reduced with the weight of the roof insulation.How do I create a front porch?
You can create an indoor porch by simply installing the front wall in the second or third roof truss. You could do the same with the rear wall of course.Can I order a storage building without a roll-up door?
Yes. You’ll then receive extra sheet material to seal the door opening.Can I place a higher or wider roll-up door in the storage building?
It is possible to install a different roll-up door. We then supply the entire storage building without a roll-up door so you can order a roll-up door with the desired dimensions yourself.
For a higher roll-up door you must construct the storage building on a raised foundation to increase the opening for the roll-up door.Can I place the storage building on a stem wall?
Yes. Contact our sales department.
What is Dripstop®?
Dripstop® is a felt layer attached to the roof sheets of the H-series storage buildings. It ensures that valuable goods and materials remain dry, even in case of condensation.Can the roll-up door be moved to the side wall?
Yes. You will then receive extra sheet material to seal the opening at the front.Can the man door also be placed on the left?
For the H-series, the man door can effortlessly be placed to the left or the right of the roll-up door. And rotating clockwise or counter clockwise.
For the E-series, the man door can only be placed to the right of the roll-up door.Can two storage buildings be permanently constructed beside each other?
No, the laws and regulations prescribe that there must be at least 100 cm between them. A distance of a meter is also necessary for installation.How is the storage building secured against intrusion?
All man doors are equipped with a cylinder lock. The roll-up doors have a latch for a padlock (not included). The storage buildings can therefore be entirely sealed off.Is it possible to install solar panels on the roof of the storage building?
Yes. To calculate the maximum snow load, you have to subtract the weight of the solar panels from the snow load.
Example: if the snow load for the storage building in question is 1,2kN/m², then the roof can withstand 120 kilos of snow per square meter.
If the solar panels for example weigh 40kg, 80kg remain. In a region where the snow load is less than 0,8kN/m² (80kg per square meter), the storage building can be equipped with solar panels.Can I make a storage building with an entry gate?
You can make a covered entry gate by installing the front wall in the second or third truss. You of course have the same option at the back.Do the storage buildings comply with the NEN 1087 ventilation standard?
The storage rooms ventilate at the back and the front under the roof trim (flashing), but this hasn’t been calculated. Ventilation standards are not necessary for storage buildings unless the application prescribes these (for instance storing chemicals).Can I place a window in a storage building?
Kroftman only supplies storage buildings without windows. If you nevertheless would like to place one or more windows in your storage building, you must do this yourself. In that case, keep in mind that the warranty on the construction and cladding will then lapse.Can I paint the storage building?
You can, but the warranty will then lapse. The sheet material has a polyester top coating. If this is covered by an extra layer of paint, the coating no longer offers full protection.Can the storage building (partly) be constructed without sheet material?
You can do this by adding extra wind bracing. The structural calculations are then however no longer applicable. Contact Kroftman to discuss what is necessary and possible in your situation.Are the storage buildings available in different colours?
Yes. You can choose from different colours for the various components (except the doors) of the H-series storage buildings. No extra costs are charged for this. Check the product page or download the colour card for an overview of the colour options.Do the storage buildings have gutters and drainpipes?
By default, the storage buildings are supplied without gutters and drainpipes. You can optionally order the matching drainage system. The Kroftman drainage system for storage buildings is entirely made of galvanised sheet steel. The system consists of drain pipes on both sides of the storage building with upright pipes (plus final bend) down to the ground. The capacity of the gutter and the number of upright pipes is tailored to the size of the storage building. The standard available colours are pearl-light grey (RAL9022) and anthracite grey (RAL 7016). You can find more details on the download page.Does the roll-up or overhead door have electrical operation?
Our storage buildings are delivered without an electric opener as standard. Optionally you can order an electric opener (including 2 remote controls) for the roll-up or overhead door.Do you have structural calculations available?
Of all our storage buildings, storage tents and container shelters we have structural calculations available in German. These are available on request and free of charge.
For these structural calculations we work with German engineers. These structural calculations always meet the ′Eurocode′ standard supplemented by German codes DIN+DIBt ensuring wide European and International acceptance. To maintain the legal status, we only provide the original untranslated documents in the German language. Should this cause you any difficulties, you can use these documents as a basis to ask a local engineer to draw up a structural calculation in your own language which meets your local requirements.Can the man door be placed on the left as well?
The man door can be installed to the left or right of the roll-up door with very little effort. You can also choose between left or right-hand opening.What about rainwater drainage?
We advise you to order the matching drainage system with your steel building. The Kroftman drainage system for steel buildings is entirely made of galvanized (Aluminum Zinc) sheet steel and is therefore a solid and durable solution with 20 years warranty. The system consists of roof gutters on both sides of the steel building with standpipes (plus final bend) to the ground level. The capacity of the gutter and the number of standpipes is tailored to the size of the steel building. The colors Aluminum Zinc (uncoated) and Anthracite (RAL7015) are in stock. More details can be found in the download section.