Spouwanker

Spouwanker is a type of fastening device used in the construction of cavity walls to secure fixtures to the wall. A spouwmuur consists of two masonry leaves with a hollow cavity between them, and a spouwanker is designed to transfer load from the installed object through or around the hollow space into the surrounding masonry. These anchors are chosen to suit the wall material, the width of the cavity, and the anticipated loads.

There are several common variants of spouwankers. Mechanical expansion anchors use a sleeve or similar mechanism that expands when the fixing screw is tightened, gripping the inner masonry. Plastic expansion anchors provide a similar gripping action behind the outer leaf. Toggle-type or pull-through anchors engage the back of the cavity or the inner leaf to secure the fixture. Chemical anchors may be used in some cavities, where resin and a threaded rod or bolt form a secure bond with the masonry.

Installation considerations include selecting the correct size and type for the wall material and load, drilling through the outer leaf to reach the cavity, and ensuring the anchor will engage solid masonry where required. It is important to follow the manufacturer’s instructions and applicable building standards, avoid overloading the anchor, and verify secure fixation after installation.

Spouwankers are commonly used for mounting windows, doors, brackets, clamps, façade elements, and other fixtures to cavity walls. They provide a means to transfer loads appropriately in structures where the hollow space between leaves must be accommodated.