There are many benefits of embracing Modern Methods of Construction (MMC) and in particular LGSF, the offsite nature provides superior accuracy and programme surety versus traditional methods of construction. LGSF benefits from speed of build as a key advantage.
Increased Productivity
Sigmat LGSF is 20%-40% quicker build time compared to traditional building methods.
Reduced Carbon Footprint
Considerable reduction in production of onsite waste material, and up to 20% reduction in embodied carbon in building fabric.
Faster Construction
Due to offsite nature, LGSF is less dependent on 'wet-trade' labour resource.
Accuracy
Accuracy and precision of up to 1mm per structural storey height, negates need for guesstimate soft joints to outer leaf fixtures
Light Gauge Steel Framing
Pros
- Lightweight leading to reduced foundation time and cost
- Very fast speed of erection and less susceptible to inclement weather build delays
- Fewer site operatives building superstructure with Covid-19 distancing benefits
- Follow on trades can begin sooner if programmed correctly
- Less waste leaving site
- Much higher level of recyclable material at end of building life
Cons
- Structure requires additional fire protection compared to RC frame
- Early engagement required in design solution to optimise programme efficiency of LGSF
Timber Frame
Pros
- Historically lower cost/m2 than LGSF, but timber prices are increasing
- FSC – sustainable construction
Cons
- High in-build fire protection costs
- Structure requires greater fire protection
- Settlement deflection up to 8mm per floor - resultant settlement cracking
- Susceptible to moisture content variations
- Height limited by legislation to 11m
Reinforced Concrete
Pros
- Very robust
- Good acoustic properties
- Inherent fire resistance
- Allows clear spans with flat soffits
Cons
- Heavy solution. Requires larger foundations
- Slow construction process compared to LGSF
- Can be more expensive than LGSF
- Large carbon footprint
- Poor recyclability at end of building life
- High on-site waste removal requirement
Load Bearing Masonry
Pros
- Trusted method of construction
- Follow on trades familiar with methods of build
Cons
- Only suitable for low rise
- Labour intensive with higher associated HSE risks
- Much slower construction process
- Access to wet trades becoming more difficult
Steel Frame with Precast Concrete Floor
Pros
- Quick to construct
- Good robustness
- Lighter than concrete option
- Good acoustic properties
- Capable of long spans
Cons
- Steel frame requires additional fire protection
- Early coordination required between subcontractors
- Can be expensive compared to LGSF
- Down stand beams required
