LK Slotted Wood 22

 

Design

Anderson Floor Warming Underfloor Heating using LK Slotted and Turning Boards Wood 22 is intended for installation on standard wood joist floors of a max. 600mm c/c. The construction comprises of a load bearing slotted 22mm chipboard floor, which replaces the standard board in a floor construction. LK Wood 22 is manufactured from environmentally approved and labelled floor grade chip-board (NOTE: as c/c 400mm is standard for the UK, c/c 600mm systems are safe).

Requirements

We recommend that to achieve optimum efficiency of the underfloor heating system the use of weather dependent (weather compensation) flow temperature control, properly balanced and set in line with the design for adjustment of the primary and loop flow. We also recommend the settings are recorded for future reference.

Construction Outline

pipe in rail

1. Floor joists
Floor joists with c/c distance 600mm.
2. Insulation
Joist insulation should fill up the entire joist cavity. The joist cavities must be sealed to prevent heat from escaping
3. LK Slotted Board Wood 22
Dim. 1200 x 800 x 22 mm
AFW Slotted Board Wood 22 has 4 slots c/c 200 mm suitable for use with AFW Heat Distribution Plate 16 and AFW Universal Pipe 16 mm.
4. Heat Distribution Plate 16
L=1150mm
5. Pipe
Anderson Floor Warming Universal Pipe dia. 16mm.
6. LK Slotted Turning Board Wood 22
Dim. 595 x 800 x 22mm
7. Vapour barrier and cell foam/rag board

Surface layer

Parquet, solid wood or laminated floor
The heating system is first covered with a moisture barrier (PE sheet) followed by rag paper or open-cell foam sheet. Parquet flooring [min. 14mm thick] is then laid in the same direction as the floor heating circuits. Always adhere to the flooring supplier’s instructions and GBR’s [TRADA in UK] guidelines for wood floors on floor heating. Always ask Anderson Floor Warming for advice for floors exceeding 25mm thickness.

Vinyl or linoleum flooring
Dry areas
Where using decorative vinyl/linoleum, first lay open-cell sheet over the floor heating, then lay and fix chipboard [min. 16mm] or plywood [min. 12mm] to the manufactures instructions. The vinyl/linoleum is then fixed over to the manufactures instructions.

Wet areas
In wetroom areas, first lay open-cell sheet over the floor heating, then lay and fix chipboard [min. 16mm] or plywood [min. 12mm] to the manufacturers instructions. Buildings Regulations apply.

Ceramics or natural stone
Dry areas
AFW Heat Distribution Plate must, after completing laying the pipe, be screwed in place in a zigzag pattern c/c 150mm. Use suitable flat headed screws (length 14-20mm). Make sure that the floor and heat distribution plates are clean, vacuum carefully.

Apply Primer on the entire surface, let dry for 1-2 hours. If there is oil or grease on the plates this must be washed off before applying primer. Glue a 13mm floor grade form stable board for floors (for example plasterboard or fibre cement board) onto the floor with glue. Apply the glue with a putty-knife, and then “comb out” the glue with a notched trowel (notched 6-8mm). Mount the floor grade form stable board within 10-15 minutes after the glue is applied. Mark out the position of the pipes at the same time, to avoid any damages in the next step, when the boards are screwed in place.

The boards are screwed in place with a screw for plaster board along all sides and between the pipe rows. Begin to screw the sides of the board 50 mm in from the corners and after that with a distance of max. 300mm in between. Screw between the pipe rows with a distance of max. 500mm between the screws. When the glue has dried after approx. 5 hours the tiling can begin.

Wet areas
AFW Heat Distribution Plate must, after completing laying the pipe, be screwed in place in a zigzag pattern c/c 150mm. Use suitable flat headed screws (length 14-20mm). Make sure that the floor and heat distribution plates are clean, vacuume carefully.

Apply Primer on the entire surface, let dry for 1-2 hours. If there is oil or grease on the plates this must be washed off before applying primer. Glue a 13mm floor grade form stable board for wet areas (for example plasterboard or fibre cement board) onto the floor with glue. Apply the glue with a putty-knife, and then “comb out” the glue with a notched trowel (notched 6-8 mm). Mount the floor grade form stable board within 10-15 minutes after the glue is applied. Mark out the position of the pipes at the same time, to avoid any damages in the next step, when the boards are screwed in place.

The boards are screwed in place with a screw for plaster board along all sides and between the pipe rows. Begin to screw the sides of the board 50mm in from the corners and after that with a distance of max. 300mm in between. Screw between the pipe rows with a distance of max. 500mm between the screws. When the glue has dried after approx. 5 hours the tiling can begin. Use levelling compound on the boards to create a sloping floor in wet areas, min. 12mm by the floor drain. After that a waterproofing/sealing layer and ceramic tiles. Follow the suppliers instructions.

Screed as an alternative solution for dry and wet areas
Alternatively, screed (including self-levelling) can be laid over the underfloor heating. Lay 2 layers of good quality DPM over the underfloor heating and ensure the DPM forms a skirt up walls of at least 65mm. Tape seal all joints. Lay the screed minimum 45mm deep. Wet areas require waterproofing applied to the manufacturers directions.

AFW Heating Circuit Manifold

The AFW Heating Circuit Manifold must be installed as shown in the design drawing. Please read the instructions enclosed with the manifold first.

Lay the piping out before assembling slotted and turning boards to avoid obstructing access to the supply and returnlines.

Assembly of LK Slotted and Turning Boards Wood 22

Slotted and turning boards are laid at right angles to the joists The maximum allowed distance between joists is 600mm. LK Slotted boards has got tongue and groove on all four sides which makes it possible allows continuous installation, i.e. joints can be made between the joists.

Short sided joints must not be positioned closer than 200mm to the short sided joint in the next row if the joints occur between the same pair of joists. The turning boards have not tongue and groove on the long sides. When the short side of the slotted board meets the turning board the tongue/ groove of the slotted board must be cut/ removed. Observe that the joint between the slotted board and the turning board needs to be supported in the middle by a floor joist.

If the installer decides not use turning boards, but to use a routing tool, the board must be fully supported from beneath.

Wood 22 floor boards must be fully supported by joists or studs along all walls. Ensure 10mm expansion gap is left around all walls and fixtures.

Glue the boards thoroughly to the joists and studs using Casco mounting glue 3303 or the equivalent.

screw
The grooves and joints of the boards must be glued using Casco mounting glue 3303 or the equivalent. The amount of glue must be generous so that an excess will be pressed out during laying; excess should then be wiped off. The amount of glue required is approx. 1.2 L per 10 square metres of floor area.

glue
Screw the boards to each joist and joist support using arow of screws. Where the short joints meet insert a row of screws in each board on the same joist, with a maximum screw distance of 150mm along all supported outer edges and short joints and 300mm along the intermediate supports. Use 3.9 x 55mm chipboard screws countersunk approx. 2mm into the board. Complete the installation one board at a time.

glue

Above floor pipe turning with LK Slotted Turning Board Wood 22

When turning pipes above floors, the slotted turning board must be fitted and the pipes must be laid at the same time.Please note that the laying of the supply and return pipe ends is done before the slotted turning board is fitted.

Heat Distribution Plate (aluminium)

Heat Distribution Plate is laid edge to edge with the slotted board in the turning compartment. The plates may be laid out at a distance of between 10-100mm and pressed down into the board slots. The plates can be shortened by snapping across the break lines. The slots in the board must be carefully cleaned (vacuum-clean the slots) before the plates are laid out.

When using ceramics as surface layer Heat Distribution Plates must be screwed in place in a zigzag pattern.

Laying the pipe

Lay the underfloor heating pipe out according to the layout diagram. Ensure the direction of flow in the loop is such that the supply line is closest to the outer wall. Number and name the loops according to the drawing. Check before you lay the pipe that the plates are clean (vacuum-clean the slots).

wood 22 laying

Press or tread down the underfloor heating pipe into the slot of the plate. After assembly the pipe must lie in the slot and must never under any circumstances touch the over-lying floor.

Entry and exit from the floor joist boxes for supply/return of the circuits is made from the cut-outs in the turning boards.

Pipes should be cut using pipe shears intended for PE-X.

Projects using LK Slotted Wood 22

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