Ask ten contractors how long a prefabricated modular house lasts and half will tell you five years, while the other half will swear by twenty-five. Both groups are telling the truth. Different steel. Different panels.
If you buy the cheapest temporary K-type board house on the market, built with ungalvanized 1.2mm black-iron angles painted with a single coat of grey primer and 8 kg/m³ EPS foam boards, humid air and rain will rust the frame joints within four or five years. That kind of shack is meant for a single two-year road-building job and nothing more.
| Modular Building Type | Main Frame & Wall Spec | Design Service Life | Relocation & Wind Rating |
| K-Type / T-Type Prefab Camp | Light C-steel + 50–75mm EPS/Rock Wool panel | 8 – 15 Years | 3 – 5 relocations (Grade 8–10 wind) |
| Folding Container House | Hinged galvanized channel + 50mm IEPS/Rock Wool | 10 – 15 Years | 5 – 8 relocations (Grade 8–10 wind) |
| Flat-Pack Container Unit | 2.3–3.0mm Q235B/Q355B galvanized frame + 75mm panel | 15 – 25 Years | 10+ relocations (Grade 10–12 wind) |
| Permanent Light-Steel Villa | G550 AZ150 cold-formed truss + 100mm insulated wall | 30 – 50 Years | Permanent build (Hurricane rated) |
When we engineer modular housing for urban and camp deployments, like our 186-unit Singapore modular housing project and our Doha site office camp in Qatar, the specification looks completely different. A true 15-to-25-year modular unit starts with cold-formed hot-dip galvanized steel frames (2.3mm to 3.0mm thick for flat-pack corner posts and beams) coated with baked electrostatic powder or marine epoxy paint.
Wall and roof panels determine how well the house handles weather and how many times you can move it. For dry desert camps or mild climates, 50mm to 75mm high-density EPS wall panels (14 to 20 kg/m³ density, B1 flame retardant) keep the unit light so a small crew can assemble a 100 m² dormitory in 3 to 5 days without heavy cranes. For crowded two-story mining camps, oilfield dormitories, or hospital isolation wards where fire safety is mandatory, upgrading the walls to 50mm or 75mm Class A rock wool or glass wool panels gives workers 60 minutes of fire protection and cuts outside generator noise by over 40 dB.
With proper roof drainage gutters, PVC floor leather over 18mm fiber-cement subfloors, and stainless steel exterior bolts, a well-built modular camp easily runs 15 to 25 years and survives 5 to 10 site relocations.
Frequently Asked Questions (FAQ)
Q: What is the difference between a K-type prefab house and a T-type prefab house?
A: A K-type house has visible exterior steel C-columns spaced on a 1.82-meter module (K=1820mm) and is the lowest-cost option for large labor camps. A T-type house hides the steel frame inside the wall panels on a 1.15-meter module, giving a flat, cleaner look and higher wind resistance for site offices and canteens.
Q: Can modular prefab houses and container camps withstand typhoons and earthquakes?
A: Yes. Standard K-type and T-type houses are braced with steel tie rods to resist Grade 8 to 10 winds and Magnitude 7 earthquakes. Heavy-duty flat-pack container units bolted to concrete strip footings resist Grade 10 to 12 typhoon winds (up to 120 to 150 km/h).
Q: How many times can a prefab camp building be dismantled and moved to a new project site?
A: Panelized K/T-type prefab houses can be disassembled and relocated 3 to 5 times with minimal panel replacement. Bolted flat-pack and folding container houses can be lifted and moved 6 to 10+ times because the steel corner castings carry the crane load.
Q: Which floor board is best for wet rooms (toilets and showers) in a modular camp?
A: Never use wood plywood in camp bathrooms because it rots and swells within a year. Always specify 18mm to 20mm waterproof high-density fiber-cement board (or magnesium board) covered with welded anti-slip PVC floor sheet or aluminum checker plate.
Q: How fast can a 200-worker modular camp be manufactured and erected?
A: Factory fabrication for a 200-person camp (dormitories, canteen, offices, and washblocks) takes only 10 to 14 days at Hihsteel. Once containers arrive on site, a 10-person crew can erect and roof the entire camp in 2 to 3 weeks.
