Metal Framed External Walls

Metal Framed External Wall

Strandec^TM panels form non load bearing as well as load bearing infill walls when fixed on medium and heavy gauge metal sections. These walls are fire resistant, with thermal shield and unmatched acoustics of both isolation and absorption built- in the system and panels. Non load bearing infill walls system comprise of Strandec^TM panels fixed on either side of a G.I. steel framed structure fixed on the plinth / slab edge between structural columns and beam / slabs/ joists/trusses – with the external panel forming the outside shell. Wall system choice will be as per performance requirements of fire, thermal insulation, acoustic levels, and other physical properties such as heights, thickness, weight, stiffness and expected wind loads, axial loads, seismic zone, and temperature zones.

The partitions can have the natural wood strand finish or screed finish - both can be further finished by plastering, or additional veneering with other cladding materials on the outside and decorative materials on the interiors.

Design Parameters

System

The choice of system will be based on the partition performance requirements – i.e height, thickness, nature of duty, fire resistance thermal shield, acoustics and other loading factors.

Components

• Strandec^TM panels - tapered edge (other edges available on request)
• SDN- Strandec^TM Natural
• SDB – Strandec^TM single side screed finished (white)
• SDC – Strandec^TM Composite
• Thickness 25, 30, 40 and 50mm
• Width 600mm
• Length 2400/1200mm

Other Components

• Studs 70MS12 to 300MS30 depending on the design
• Tracks 70MT12 to 300MT30 depending on the design
• Deep Tracks with extra flange where required for deflection heads
• Braces - 38MB09 and 100MB12 for horizontal bracing and cross bracing to take care of axial loads and racking loads.
• Glass Fibre Mat as a substrate for finishing plaster where required
• Screws
• Nylon Plugs
• Sound Synth
• Control Joints
• Sealants
• Glassfibre Tape
• Jointing Compound
• Finishing plaster if required

System Choices

Strandec^TM Panel made from Inorganic Bonded Composites completely mineralized using Portland cement makes it as strong as wood which does not shatter or crack and is fire resistant. The matrix structure gives it strength with lightweight and also with unique acoustical and thermal insulating.

The definitive properties of Strandec^TM combined with the established strengths of GI steel sections a wide range of non load bearing partitions can be assembled in a fast track construction with the added advantages of dry
construction.
Strandec^TM Metal Frame systems perform to varying fire ratings, acoustics, stiffness and heights as per the table.

Strandec^TM External Framed Walls – Technical Performance
Strandec^TM External Framed Walls are non load Bearing using fast track dry construction techniques

Sl.No	Code	Construction	Thickness(mm)	Thermal Resistance M².k/w	Weight Kg/M²	Fire Resistance mins	Sound Insulation STC(dB)
Light Duty External Infill Walls				R-value			STC (dB)
1	70MF/W120	25mm SDN on the exterior and 25mm SDB on the interior of 70MS12	120	0.932	25	30	46
2	100MF/W160	30mm SDN on the exterior and 30mm SDB on the interior of 100MS12	160	1.052	32	60	46
3	70MF/W170	50mm SDS on the exterior and 50mm SDB on the interior of 70MS12	170	1.552	35	120	48
4	100MF/W200	50mm SDS on the exterior and 50mm SDB on the interior of 100MS12	200	1.552	36	120	48
Heavy Duty External Infill Walls
5	150MF/W230	40mm SDN on the exterior and 40mm SDB on the interior of 150MS12	230	1.312	35	90	49
6	200MF/W300	50mm SDS on the exterior and 50mm SDB on the interior of 200MS15	300	1.552	36	90	49
Heavy Duty Industrial External Walls with Joists
7	250MF/W350	50mm SDS on the exterior and 50mm SDB on the interior of 250MS15	350	1.552	37	120	50
8	300MF/W400	50mm SDS on the exterior and 50mm SDB on the interior of 300MS20	400	1.552	40	120	50
Note: For partition heights more than 5 metres suitable joists have to be provided to transfer the loads to load bearing members.

Applications

Strandec^TM walls can be an ideal choice for various end users such as offices, schools, hotels, hospitals, industries, theatres etc

Construction Procedures

Framework

Mark the position of the partition and openings (doors, glazing, services passing thru etc). on both the floor and
the soffit /ceiling. Secure the floor track and the ceiling track at not more than 600mmcentres using plugs or
screws. For broader tracks secure the plugs by staggering alternatively at 300mm centres.

Place the studs of the accurate size in the floor track and the ceiling track and turn into position. Ensure that the track has enough head support. Deflection head should be placed where r e q u i r e d .

Studs placed at the ends should be secured to the structural member. Horizontal bracing (if required for axial loads) to be placed on both sides of the studs with pan head screws. End studs are to be blocked using tracks as shown. Joists with proper anchoring to structural members should be provided as required to accommodate shorter length studs.

Diagonal bracing (if required for racking loads) should be secured on both sides with pan head screws as per design. Studs should be secured on either side of openings with proper headers to distribute loads above. Additional Bracing to take heavy loads should be secured at the desired locations. Services conduits can be placed in the cutouts of the studs after fixing panels on one side is completed

Panel Fixing

Strandec^TM panels of the desired thickness are to be placed horizontally with screws ( screws being at least 10mm longer than thickness of the panel ) fixed to the studs at 300mm centres vertically on the studs. (That is every stud backing the panel will have three screws one on either end and one in the centre).The panels on the opposite sides should be staggered by fixing a 300mm starter panel (easily cut at site) first at the bottom and the other standard width panels thereafter above. Control Joints are to be provided for partition runs over 6metres at every 6metres.

Jointing

Glass fibre tapes are placed on the centre between two abutting panels at the centre of the Strandec SDB tapered
edge panels after filling up one coat of joint compound to hold the tape in position. The second coat is applied after the first coat is dried to cover the tape as well as the complete tapered portion of the panels on either side of
the joint. The joint compound is spread to a level on both sides by a trowel.

Surface Finish

The final coat a skim coat is then spread on the joint and the entire surface.

Vapour Barriers

Vapour barriers can be provided where required in locations extreme cold and heat fluctuations. The
vapour barrier should be placed on the external side of the partition frame behind the Strandec^TM panel on the
exterior.

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