Modular construction has become increasingly popular as an efficient and modern approach to house building. This method involves manufacturing building components or complete modules in a controlled factory environment and then transporting them to the construction site for assembly. Here are some modular construction options available in Ireland, along with their corresponding U-values:
Timber Frame Modules 
  • Timber frame modules, constructed using timber framing, offer excellent thermal performance and design flexibility. U-values for timber frame walls typically range from 0.15 to 0.25 W/m²K, depending on the insulation used and the wall construction design. Timber frame floor and roof modules can achieve U-values between 0.10 and 0.20 W/m²K. 

Light Gauge Steel (LGS) Modules 
  • LGS modular construction utilises light gauge steel frames for structural support. LGS modules can achieve U-values similar to timber frame modules, with wall U-values ranging from 0.15 to 0.25 W/m²K and floor/roof U-values ranging from 0.10 to 0.20 W/m²K, depending on insulation and assembly details. 

Concrete Modules 
  • Concrete modular construction involves the use of precast concrete panels or modules. Concrete modules provide excellent thermal mass and can achieve U-values between 0.15 and 0.30 W/m²K for walls, floors, and roofs, depending on insulation and panel thickness. 

Hybrid Modules 
  • Hybrid modular construction combines different building materials and systems to create customised modules. The U-values for hybrid modules will depend on the specific materials and insulation used in the construction, but they can achieve similar thermal performance to timber frame or LGS modules. 

Volumetric Modules
  • Volumetric modular construction involves the manufacturing of entire three-dimensional modules that are joined together on-site. U-values for volumetric modules will depend on the specific wall, floor, and roof construction, as well as the insulation used. They can range from 0.15 to 0.30 W/m²K, similar to other modular construction options. It's important to note that the U-values mentioned above are approximate and can vary based on factors such as insulation type, thickness, and construction details. Additionally, achieving desired energy efficiency levels requires proper design, construction techniques, and attention to sealing and thermal bridging. 

When considering modular construction for house building in Ireland, consulting with modular construction companies, architects, and building professionals who specialise in energy-efficient design can provide more specific information and guidance on the available options and achieving desired U-values.