Shaft Encasement System

A high performance fire protection system to service risers in high rise buildings. Our Shaft Encasement System allows installation to take place from the landing side only.

This system is non load bearing and designed to fit between structural floors.

• 60mm, 70mm, 92mm & 146mm I Stud system variants
• Single, double and triple plasterboard layer configurations
• Maximum height up to 7.5m based on a limiting deflection of L/240 @ 200Pa
• Up to 120 minutes fire rating to BS476:22 1987
• Up to Rw50dB acoustic performance#
• Heavy & severe duty ratings*

# some acoustic performance estimated – further information available on request

* Duty grade ratings estimated

Framework Installation

To be read with reference to BS 8000:8 2023 and in conjunction with full Speedline / Tradeline project specific documentation which is created and available on request.

Head Track

Install Metsec Drylining U tracks to soffit in the centre of the profile at 600mm maximum centres for up to 72mm wide U tracks and staggered across the base of the track at 600mm maximum centres with suitable fixings for 94mm and 148mm wide U tracks.

Base Track

Install Metsec Drylining U tracks to the slab in the centre of the profile at 600mm maximum centres for up to 72mm wide U tracks and staggered across the base of the track at 600mm maximum centres with suitable fixings for 94mm and 148mm wide U tracks.

Stud

Install row of Metsec Drylining I studs friction fitted into tracks at 600mm centres.

Deflection Head

If structural deflection is required, please refer to the Metsec Drylining Standard deflection head detail for guidance.

Partition Brace

Metsec Drylining partition brace (PB24) or flat strap (FS24) is needed behind horizontal plasterboard joints to enable the correct plasterboard perimeter fixings, prevent passage of fire and reduce cracking. In single layer applications PB24/FS24 is fixed to the studs. In double layer applications FS24 is installed in-between the plasterboard layers behind the horizontal plasterboard joint in the outer layer.

Plasterboard Installation

Coreboard

Single layer of 19mm Coreboard cut 25mm less than the overall height is installed between the I studs secured with Shaft encasement brackets ASB62B at 600mm maximum centres with the use of 2 waferhead screws per bracket.

The 25mm gap is left at the top of the partition. Fire resistant plasterboard packers 100mm deep are screw fixed to the Coreboard at the head of the partition.

Plasterboard – Single Layer

Plasterboard must be fixed at 300mm maximum centres within the body and perimeter of the board.

FS24 must be included behind any horizontal plasterboard joint.

Position drywall screws not less than 10mm from the paper bound edge of the plasterboard and 13mm from any cut edge. Ensure a minimum of 10mm penetration into the studwork.

Recess heads of drywall screws below surface of plasterboard but do not break paper or gypsum core.

Plasterboard – Double Layer

Inner layer of plasterboard can be screw fixed at 600mm maximum centres within the body and perimeter of the board however the outer layer must be fixed at 300mm maximum centres within the body and perimeter.

The outer layer of plasterboard must be fixed with all joints staggered in relation to the inner layer. FS24 must be included behind any horizontal plasterboard joint in between the inner and outer plasterboard layer.

Position drywall screws not less than 10mm from the bound edge of the board and 13mm from any cut edge. Ensure a minimum of 10mm penetration into the studwork.

Recess heads of screws below surface of plasterboard but do not break paper or gypsum core.

Plasterboard – Triple Layer

Inner layers of plasterboard can be screw fixed at 600mm maximum centres within the body and perimeter of the board however the 3rd final outer layer must be fixed at 300mm maximum centres within the body and perimeter.

The outer layer of plasterboard must be fixed with all joints staggered in relation to the 2nd layer. FS24 must be included behind any horizontal plasterboard joint in between the middle and outer plasterboard layer.

Position drywall screws not less than 10mm from the bound edge of the board and 13mm from any cut edge. Ensure a minimum of 10mm penetration into the studwork.

Recess heads of screws below surface of plasterboard but do not break paper or gypsum core.

The above is issued as a guide – full system specific documentation (dependent on required performance) is available on request.

Last updated 20/07/23

For more information or for details of your nearest stockist please contact us on +44 (0) 121 601 6075 or Metsec.DryLining@voestalpine.com.