SOLID HARDWOOD FLOORING

SPECIFIER'S INFORMATION - CLIP SYSTEM FLOORS
Commercial / Residential

C 1.1.1

 


JUNCKERS CLIP SYSTEM

C 1.0 General information
C 1.1 Clip System Information
C 1.1.1 Specifier's Information
C 1.1.2 Laying Instructions

Fig. 1

GENERAL DESCRIPTION OF FLOOR SYSTEM

This floor system consists of Junckers solid 2-strip boards and planks laid with clips on a resilient intermediate layer, which gives good walking comfort and step-sound reduction properties.

The system is suitable for laying in both residential and commercial buildings, and can be laid in combination with underfloor heating systems, see E 4.0.

Construction height from approx. 17 mm.

Please note that full information on a floor system comprises the data in C 1.0, C 1.1, C 1.1.1 and C 1.1.2, see Fig.1.


Floor Components - Clip System

1 - Solid Hardwood Flooring

Wood species, dimensions, grades and finish:
22 x 129 mm Solid 2-strip: see B 2.0
14 x 129 mm Solid 2-strip: see B 3.0
20.5 x 140 mm Planks: see B 5.0
20.5 x 185 mm Planks: see B 6.0
15 x 129 mm Planks: see B 7.0

2 - Clips
• 25-50 % RH: 129.1 mm/1 hole
• 35-65 % RH: 129.4 mm/2 hole
• 60-85 % RH: 129.8 mm/3 hole

3 - Intermediate layer
• Junckers PolyFoam
• JunckersFoam
• Floor cardboard, 500 g/m2
• Polystyrene

4 - Header joint adhesive
• Junckers SylvaFix

5 - Junckers expansion strip
• 12 x 12 mm

6 - Expansion gap at the wall
• 2 mm per metre of floor width on each side, always min. 12 mm (UK: min. 15 mm). Is also required at fixed points, e.g. columns.

Fig. 2

 


SYSTEM SPECIFICATIONS

The clip system is installed as a floating floor on a dry, loadbearing subfloor of concrete, lightweight concrete, screed or wooden material.
The subfloor must be flat, with a maximum deviation of 2 mm under a 1.5 metre straight edge (UK: 3 mm under 2 m straight edge). The surface must be smooth. Any minor irregularities must be corrected.
The choice of intermediate layer depends on the structure of the subfloor and the moisture conditions. 


BOARDS

Boards are laid in a continuous, irregular pattern with header joints distributed randomly across the entire floor. To avoid waste, the offcut from the last completed row is used to start one of the following rows.
Header joints are glued using Junckers SylvaFix header joint adhesive.


INTERMEDIATE LAYER AND SUBFLOOR

For concrete or screeded floors where there is a risk of residual moisture Junckers PolyFoam is used, see H 3.6.

On wooden subfloors JunckersFoam is used, see H 3.5.

For further detailed information on choice of intermediate layer see C 1.1 - Intermediate layer. 


STEP-SOUND REDUCTION

For further information, see E 5.0.


LOADBEARING STRENGTH

The loadbearing strength of the clip system depends on the type of load and subfloor. In some cases the total widthways expansion of the floor, depending on the room’s climate and the clip size, can also be of significance. The frequency of point loads is also important.

Table 2 presents stiffness and bearing strength in accordance with the load classes in EN 1991-1-1.

For further definition of load classes and types, see C 1.0 – Stiffness and bearing strength.

TABLE 2

Loading types

Loading category

Area- and Point load

Wheel load

A+B:
Residential + Office

Approved (all products)
Polystyrene: 30+40 kg/m3
approved*

Approved (all products)
Polystyrene: 30+40 kg/m3
approved* 

C1+C2+C3+D1:
Public buildings and shopping areas

Approved (20.5 and 22 mm only)
Polystyrene: 40 kg/m3
approved*

Approved (20.5 and 22 mm only)
Polystyrene: 40 kg/m3
approved* 

* On top of the polystyrene a load spreading sheet of minimum 10 mm chipboard or plywood with tongue and groove are used. 

 


CONSUMPTION OF MATERIAL

Boards: approx. 2% wastage
Clips: see C 1.1 - clips
Intermediate layer: approx. 10% wastage
Junckers SylvaFix: 1 bottle, 0.75 litres per 50 m2
Junckers expansion strips: 2 x floor width

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