The right chemistry for timber engineering

The fischer FIS EM Plus injection mortar stands out due to its broad range of applications. In addition to permanently secure fixings in concrete and post-installed reinforcement connections, the epoxy mortar ensures the reliable transfer of high tensile loads in engineered timber construction. In combination with the FIS A anchor rods or FIS IG internally threaded anchors, load-bearing glued laminated timber components (spruce, fir or pinewood) can be joined safely.

Application reliability is ensured by the German “allgemeine bauaufsichtliche Zulassung” (general building authority approval (abZ)) /  “allgemeine Bauartgenehmigung” (general type approval (aBG)) Z-9.1-914 and ETA-19/0657, which regulate the approved bonding of steel rods in timber components in Germany and other countries — for example in wood-wood, wood-steel and wood-concrete connections.

A comprehensive range of accessories as well as system components made of galvanized steel and stainless steel enable numerous connections and reinforcements in timber for interior and exterior applications when used in combination with FIS EM Plus.

The FIS A anchor rods are available in sizes M6 to M30 with variable anchoring depths, while FIS IG internally threaded anchors can be used with internal threads from M8 to M20. In addition, concrete ribbed steel (rebar) with diameters from 6 to 32 mm are also approved.

The extensive accessory range also includes DD-E / DD-S centering clips for centering anchor rods and internally threaded anchors in the borehole, injection aids, extension hoses, manual and battery-operated injection devices, and much more. A comprehensive range of accessories for cleaning drill holes, such as blowers and brushes, is also available.

With its innovative internally threaded solution, fischer enables the realization of flush-mounted and flush-removable fixing points. This makes an important contribution to safe and cost-efficient transport, as the risk of bending protruding threaded rods or damaging the thread is avoided, and the available transport surface can be optimally utilized.

The system solution also allows invisible connections between timber components. This opens up new design possibilities for architecturally appealing joints, as invisible connections do not interrupt the uniform appearance or the natural character of the timber surface.

The application of the new fischer system solution for conventional attachments can be carried out either as pre-positioned installation or through installation, and is exceptionally straightforward: After drilling and cleaning the borehole, the mortar is injected from the bottom of the borehole upwards, free of air bubbles. The resin and hardener components, stored in two separate chambers, are mixed and activated in the static mixer during extrusion from the injection cartridge. The steel anchor is then inserted by hand with a slight twisting motion until it reaches the bottom of the borehole.

Before insertion, the fischer DD-E centering clip is attached to the end of the threaded rod, while the DD-S centering clip is positioned at the embedment depth. The clips are inserted into the borehole together with the anchor and ensure precise centering, so that the anchor is uniformly surrounded by injection mortar on all sides.

For invisible connections between two timber components and for filling deep boreholes, the timber construction method commonly known as bypass injection is also approved. In this process, the borehole is filled via transverse drill holes, starting from the bottom of the borehole. In all applications, the mortar bonds the steel components fully and continuously to the borehole wall.

The FIS EM Plus is available in various cartridge sizes with volumes of 300 ml, 390 ml, 585 ml and 1,500 ml, each tailored to the specific application and demand.