Zinco Shear-Fix LF 300 for absorbing shear and tensile forces

Scope of delivery:

1 base plate
1 Connector LF 300 or LF 600
2 M10 nuts (Stainless steel)
5 wood screws (galvanized steel)
2 EPDM spacers (1 large + 1 small)
1 bit

Preliminary remarks:

The installation of the Shear-Fix LF 300 and LF 600 is basically identical.
The installation and sealing of the base plate (fixed flange) varies slightly depending on the sealing material used. Work step 3 is therefore divided into waterproofing / sealing with bitumen and polymer bitumen membranes and waterproofing / sealing with plastic or elastomer membranes. Normally, installation is carried out on rafters made of solid wood, KVH (NH C24, S10 or higher) or similar suitable substrates.

The rafter width should be at least 100 mm (screw holes pre-drilled with D=5 mm, otherwise at least 140 mm). The base plate (fixed flange) is positioned in the center.

When installing in timber formwork or thick wood (e.g. Kerto or similar), the installer must procure suitable screw fasteners. The required material thickness of the shuttering depends on these fasteners.

The choice of fasteners must meet the requirement of a load of at least 3 kN for the Shear-Fix LF 300.

Notice
The illustrations in these installation instructions are shown when fastening to the eaves. Irrespective of this, installation is also possible within the roof surface to create shear protection

Installation steps:

1. Measure and mark the installation positions. In the case of bituminous waterproofing / sealing, the waterproofing membrane should be cut to the size of the base plate in order to avoid excessive elevation of the construction in the area of the base plate.

Screw the base plate in place

2. Properly install the base plate (fixed flange) at the marked position using the 5 wood screws supplied. Ensure that the screws are perpendicular to the base plate. Suitable bit inserts are included in the scope of delivery.

The screw holes should be pre-drilled to 5 mm.

Notice:
Contractor and installation in accordance with DIN 18195 and guidelines for flat roof construction. Only for use with non-pressing water in accordance with DIN 18195, DIN 18531 and guidelines for flat roof construction. For installation in concrete, use at least 4 Würth concrete screws W-BS/A4 Ø 6×65 anchors per base plate (5 for LF 600) or similar according to manufacturer's specifications.

3. Cut to size from the waterproofing membranes used.

Waterproofing of the roof with bitumen and polymer bitumen:
For waterproofing of the roof with bitumen and polymer bitumen membranes, at least two layers must be applied in accordance with the regulations. The overlap of the 1st layer must be at least 8 cm beyond the base plate; the 2nd layer must also be welded with at least 8 cm overlap beyond the 1st layer.

For single-layer bitumen waterproofing, proceed in accordance with the manufacturer's instructions. Mark the holes for the threaded bolts on the blanks and punch them out with a Ø 12 mm punch.

Notice:
The larger EPDM intermediate layer supplied is not required for bituminous waterproofing / sealing.

Plastic or elastomer membranes:
For waterproofing of the roof with plastic or elastomer membranes, place the large EPDM intermediate layer on the base plate. The size of the cut-to-size waterproofing membrane must be such that it can be professionally hand-welded over the EPDM interlayer in accordance with the manufacturer's instructions.
Mark the holes for the threaded bolts on the blanks and punch them out with a Ø 12 mm punch.

Notice:
No waterproofing membranes laminated with separating or protective fleece on the underside may be used.

Lay a larger EPDM intermediate layer

Perforated cutting of the waterproofing membrane

Professional welding of the cut to size

Lay small EPDM intermediate layer

4. Place the shear holder (loose flange) over the threaded bolts and tighten evenly with the M10 nuts (wrench size 15 mm) alternately with a minimum of 20 to a maximum of 24 Nm. The use of a torque wrench is recommended to ensure the required tightening values.

Shear-Fix LF 300 via threaded bolt

Insert Shear-Fix LF 600 via threaded bolt

Tighten M10 nuts with 20 to max. 24 Nm

5. Check the tightness of the nuts twice over 24 hours and retighten if necessary.

6. Finally, check all weld seams of the sealing blanks and the tightness of the screw fixing.