metal stud wall framing

Metal stud framing is the standard method for building non-loadbearing partition walls in UK commercial and residential construction. The system uses cold-rolled steel C-studs located into U-shaped floor and ceiling tracks, with plasterboard fixed to the face of the frame to complete the partition. It’s faster to install than timber stud, dimensionally stable, and compatible with a wide range of acoustic and fire performance specifications. Before ordering materials, understanding what goes into a complete system – and how to calculate quantities accurately – saves time on site and avoids the cost of emergency re-orders mid-job.

The Components of a Metal Stud Partition

A standard metal stud partition uses five main component types: floor track, ceiling track, C-studs, noggins, and plasterboard. Fixings and acoustic consumables sit alongside these but are often overlooked at the ordering stage.

Floor and Ceiling Track

U-shaped track forms the perimeter channel into which the studs locate. Floor track is fixed to the structural floor slab or screed, and ceiling track is fixed to the soffit or structural ceiling above. Track is specified to match the stud width – 70mm stud requires 70mm track throughout.

On most commercial applications, the ceiling track is fitted as a deflection head detail. Rather than fixing the stud rigidly into the ceiling track, the stud is left free to move vertically within the track channel – typically 10-25mm of movement is allowed. This prevents structural loads from the floor above being transferred into the partition when the building deflects under load. Deflection head track is available as a proprietary product or can be achieved by leaving the top 25mm of the stud unfixed within standard track.

Track is usually ordered in 3000mm or 3600mm lengths. For a standard room perimeter, calculate the total linear metres of floor and ceiling runs and divide by the track length to get pack quantities, adding 10% for cuts and waste.

C-Studs

C-studs are the vertical members of the frame, running from floor track to ceiling track at standard centres of 600mm. For additional lateral stiffness – on tall partitions, walls taking heavy fixings, or where double boarding is specified – 400mm centres are used instead.

Stud length needs to be ordered to suit the floor-to-ceiling height. Most suppliers stock studs in incremental lengths, so order the next standard length above your clear height measurement and cut to fit on site. Allow for the track depth at floor and ceiling – a 2700mm clear height with 50mm track at floor and ceiling needs a stud cut to around 2600mm.

For a standard partition at 600mm centres, divide the total partition length by 0.6 to get the number of stud bays, then add one for the final end stud. A 6 metre partition needs 11 studs at 600mm centres (10 bays plus one). Add studs for door openings, which require doubled studs at each jamb and a stud above the opening head.

Noggins

Horizontal noggins are cut from stud material and fixed between vertical studs to provide lateral bracing and fixing points for heavy wall-mounted items. On standard partitions, noggins are not always required at regular intervals – they’re typically positioned at specific heights where fixings are anticipated, such as at sanitaryware heights in bathrooms or at worktop height in kitchens.

On tall partitions exceeding around 3 metres, intermediate noggins at mid-height are often specified to improve lateral stiffness. The noggin is cut from the same stud section and friction-fitted or screwed between adjacent studs.

Estimating noggin quantities is straightforward – allow one noggin per stud bay at each required height, cut from standard stud lengths with minimal waste if lengths are planned in advance.

Plasterboard

Board specification depends on the performance requirements of the partition. For standard non-acoustic, non-fire-rated partitions, 12.5mm standard board on one or both faces is typical. For acoustic partitions targeting Part E compliance, two layers of 12.5mm board or one layer of 12.5mm plus one layer of 15mm acoustic board on each face is the standard starting point.

Board coverage per sheet is 2.88m² for a standard 2400x1200mm sheet. Calculate the total face area of the partition (both sides), divide by 2.88, and multiply by the number of board layers. Add 10-15% for waste, cuts around openings, and damaged boards.

For fire-rated partitions, the board specification is defined by the tested system – check the manufacturer’s system data for the correct board type, thickness, and layer configuration for the required fire rating.

Fixings

Plasterboard is fixed to the metal frame using self-drilling drywall screws. The standard fixing for a single layer of 12.5mm board to a metal stud is a 25mm fine-thread drywall screw. For double boarding, the second layer requires a longer fixing – typically 38mm or 45mm – to ensure adequate penetration into the stud.

Frame fixings for track to concrete or masonry typically use powder-actuated pins or masonry screws at 600mm centres. Track to timber structural elements uses standard wood screws.

Fixings are easy to underestimate at the ordering stage. A rough working figure for drywall screws is one screw per 300mm of stud at each board layer – so a 2700mm stud with two board layers on one face needs around 18 screws per stud. Multiply across the number of studs and add 20% for waste and re-dos.

Acoustic and Fire Consumables

Two consumables that regularly get forgotten until the job is underway are acoustic mineral wool and acoustic sealant.

Acoustic mineral wool slab fills the cavity between the stud faces for sound-rated partitions. For a 70mm stud at 600mm centres, 50mm slab cut to 600mm widths fills the cavity adequately. Calculate the total wall area and order accordingly, allowing for cutting waste.

Acoustic sealant is applied at all perimeter junctions – floor, ceiling, and return walls – before the final board layer. A standard 380ml cartridge covers approximately 8-10 linear metres at a standard bead size. For a typical room, two or three cartridges is usually enough, but it’s worth having additional on site.

A Practical Quantities Example

For a straightforward 6m x 2700mm partition with 70mm studs at 600mm centres, single-boarded on both faces with 12.5mm standard board:

  • Floor track: 2 lengths of 3000mm (6 linear metres)
  • Ceiling track: 2 lengths of 3000mm (6 linear metres)
  • Studs: 11 at 2600mm cut length (order 12 x 2700mm standard lengths)
  • Plasterboard: 6m x 2.7m = 16.2m² per face, x2 faces = 32.4m², divided by 2.88 = 12 sheets (order 14 allowing for waste)
  • Drywall screws: approximately 200 screws for single board both faces

This is a simplified example and real jobs will have door openings, service penetrations, and acoustic requirements that change the quantities. The principle – calculate track linear metres, stud count by bay, and board by area – applies to any partition configuration. The full metal stud and track range is available at Online Insulation across all standard stud widths and track sizes. For acoustic partition builds, the resilient bars range covers decoupled wall applications where standard stud framing alone won’t hit the acoustic target. The MF ceiling system and wall lining system ranges complete the drylining system for projects requiring ceiling and wall lining treatment alongside partition work.