Product Installation - Kingspan K17
Fixing the Dry Lining Boards
Depending on the specified fixing method; traditional plaster dab bonding, proprietary adhesive bonding, nailing / screwing to vertical timber framing or battens, screwing to adhesive bonded metal furring systems, nailing / screwing to timber joists or rafters or mechanical fixing directly to masonry substrates, fixing should proceed as follows:–
Preparation
The ceiling lining should be in position before wall lining commences. Wall mounted fittings such as electrical sockets should be fitted so as to take into account the additional wall thickness.
Heavy surface mounted fittings will require provision for the fixing load to be applied direct to the supporting wall and not to the K17 in isolation. On existing constructions all surfaces should be clean and free of loose or flaking materials. Wallpaper should be stripped and surface mounted fittings removed.
Window / Door Reveals and Soffits
Narrow widths of board should be cut and rebated to allow a plasterboard / plasterboard joint at the angle. Fixing should employ the same method as is used for the plain wall areas.
Care should be taken to ensure that the cavity in cavity wall constructions is not bridged by the board or fixing medium in such a manner that would allow the passage of water through to the inner leaf. Where adhesives are employed, soffit boards and boards at window heads should be temporarily supported.
Traditional Plaster Dab Bonding
This method is for applications to brick, block or concrete masonry cavity walls. The method usually involves setting out a continuous fillet of gypsum adhesive around perimeter wall and ceiling junctions, and around any openings in order to provide a seal.
Vertical dabs of the gypsum adhesive are progressively applied to the background together with a continuous fillet at skirting and ceiling level. The number, size and lay–out of the dabs will depend on the chosen gypsum adhesive manufacturer’s recommendations. Boards are then located against the adhesive dabs and tapped back to align with predetermined guidelines on the floor and ceiling. Nailable plugs are recommended to complement the plaster dab bond.
These are normally applied at a rate of 3 No. per board after the plaster dabs have set (two fixings positioned at the top of each board, one in the board centre).
Proprietary Adhesive Bonding
This method is for application to sound, plane concrete or plastered wall surfaces on cavity walls. Bostik 1440 adhesive is applied to the wall surface in strips to a predetermined pattern that coincides with the edges of the board, and then a further strip is applied horizontally at the midpoint of the board.
Strips of Bostik 1440 pads are then applied to the wet adhesive, which should be allowed to become tacky (this generally takes around half an hour). The protective paper is then removed from the foam strips, and a coating of adhesive is applied to the corresponding position on the Kingspan Kooltherm K17.
After a suitable delay to allow the adhesive to become tacky the board should be accurately offered up to the wall and pressed firmly back onto the pads. Nailable plugs are recommended at a rate of 3 No. per board, to be applied after the adhesive has set (two fixings positioned at the top of each board, one in the board centre).
Mechanical Fixing to Vertical Timber Framing / Battens
This method may be used on timber frame constructions or on any dry masonry walls that will support and retain the battens and associated fixings. K17 should be fixed to timber framing / battens set at maximum 600 mm centres and positioned horizontally at floor and ceiling level. The timbers should run vertically and be wide enough to offer a minimum 20 mm support to all four edges of the board.
Drywall screws or, alternatively, galvanised clout nails, long enough to allow a minimum 25 mm penetration of the timber, should be placed at 150 mm centres and not less than 10 mm from the edges of the board. They should be driven straight with the heads embedded just below the surface of the board. Care should be taken not to overdrive nails / screws. Timbers should be treated where appropriate.
Mechanical Fixing to Metal Furring Systems
K17 Insulated Plasterboard can be fixed by the use of proprietary metal framing systems to brick, block or concrete walls. The metal frame should be fixed to the masonry or concrete wall in accordance with the manufacturer’s instructions to provide a true and level base for the board.
The frame should be set vertically at a maximum of 600 mm centres to coincide with board joints and midpoint of board. Short lengths of metal framing should be fixed horizontally between the vertical pieces at skirting level, at the midpoint of the board and just below the ceiling or soffit level.
Provision for horizontal services behind the board can be made by the use of two pieces of metal framing set no more than 300 mm apart. Kingspan Kooltherm K17 should be screw fixed to each metal framing section with self drilling and tapping, countersunk, surface coated (to avoid corrosion), screws placed at 150 mm centres.
Screws should not be sited less than 10 mm from the edges of the board. The screws should be driven straight until the heads are slightly below the paper surface of the plasterboard facing. Care should be taken not to overdrive screws.
Mechanical Fixing to Timber Joists or Rafters
K17 may be used to line ceilings. Installation is similar to that of standard plasterboard. Boards must always be placed with the long edge running across the joists, rafters or battens and all edges must be supported. Timbers must offer a minimum 20 mm support to all four edges of the board. This will necessitate the use of noggings placed between the joists to coincide with the long edges of the board. Drywall screws or, alternatively, large–headed galvanized / sheradised clout nails should be used to fix the board. These must be long enough to allow a minimum 25 mm penetration of the supporting timber, and be placed not less than 10 mm from the edges of the board and be spaced at 150 mm intervals along all supporting timbers.
Mechanical Fixing Directly to Masonry Substrates
This method is for application to fair finished brick, block and concrete cavity walls where K17 is to be finished with gypsum plaster. The wall should be sound, dry and level (as surface irregularities may impede fixing of the board). The board should be fully restrained using mechanical fixings. The number and type of such fixings should be in accordance with the fixing supplier’s recommendations, and should be evenly distributed over the whole area of the board. Fixings should not overlap board edges.
Finishing
Tapered edged boards allow the employment of standard dry–lining techniques. A plaster skim finish can also be applied to the boards. The finishing should be carried out in accordance with the specified manufacturer’s instructions, particularly in relation to the need to allow thorough drying of the plaster prior to decoration.
Fire Stops
Current Building Regulations / Standards should be considered with regard to the requirements for and provision of fire stops.
Cutting
Cutting should be carried out either by using a fine toothed saw, or by scoring with a sharp knife, snapping the board over a straight edge and then cutting the facing on the other side.
Ensure accurate trimming to achieve close butting joints and continuity of insulation.