Insulation values alone do not describe thermal performance.
BUILDING SYSTEMS · CLIMATE + ENVELOPE
Climate and envelope planning for international prefab housing.
The same factory house should not be assumed suitable for a tropical island, desert inland site and cold climate without changing the envelope and services.
SHORT ANSWER
Specify the envelope from the destination climate and code pathway.
Define temperature, humidity, solar exposure, rainfall, wind, coastal salt, heating/cooling strategy and local energy/building requirements. Then qualify wall, roof, insulation, glazing, ventilation and moisture-control details for the chosen building system.
KEY PROJECT POINTS
What should drive the decision.
These are project inputs, not substitute engineering or automatic product approvals.
High humidity increases condensation and mould risk.
Hot climates need solar/shading and cooling strategy.
Cold climates need thermal-bridge and vapour-control review.
Coastal sites require corrosion-resistant materials and maintenance.
Wind-driven rain can control façade and opening details.
Build a climate brief
Use actual project climate/exposure rather than a generic regional label.
Coordinate insulation and ventilation
Better insulation without appropriate ventilation/moisture design can create condensation problems.
Protect openings and joints
Windows, doors, module joints, roof edges and service penetrations are common envelope weak points.
Match services to envelope
HVAC sizing and comfort depend on the actual wall/roof/glazing build-up and occupancy.
PROJECT INPUTS
What to have ready before asking for the exact system.
A stronger brief shortens the gap between product interest and a useful technical/commercial response.
Destination
Temperature range
Humidity
Solar exposure
Rainfall
Design wind
Coastal/salt
Insulation target
Glazing
Ventilation
HVAC strategy
Local energy/building requirements
EVIDENCE BOUNDARY
Envelope claims must match the exact wall, roof and glazing build-up.
Verify materials, insulation, thermal/fire data, windows/glazing, seals and corrosion protection for the exact selected building. Brand-level marketing is not enough.
FAQ
Questions project teams usually need answered.
Can one standard prefab house be used in every climate?
No. Structure, envelope, glazing, services and corrosion protection may need destination-specific changes.
Is more insulation always better?
Not by itself. Moisture, ventilation, thermal bridging and HVAC need to work together.
Is CAIRNHUS a New Zealand H1 home system?
No. CAIRNHUS is US-focused and should not be presented as a New Zealand H1-compliant home system.