Installation of long spiral rods arranged according to the project above door and window openings is a quick and easy way to create or repair brick (block) arched lintels in buildings. Prestressed stainless steel rods can be used in existing brick (or stone) masonry to form a reinforced brick (gas block, concrete block, stone) bridge over a flat level or curved vault.
Failure of jumpers occurs for a number of reasons. Shallow or flat brick arches can fail due to insufficient support on either side of the arch, concrete lintels tend to rotate, wood warps from drying or moisture, and metal lintels can degrade over time as rotting or corrosion begins.
There is nothing unusual in the fact that an old wooden or metal window frame forms an independent lintel that helps support the masonry above. When these load-bearing structures (windows and doors) are replaced with less durable PVC blocks, the support from this lintel is lost and the masonry can begin to crack as it sags.
Where lintels are bowed or damaged, this method of strengthening and repairing prefabricated arch lintels can be supplemented by the provision of metal anchors installed vertically up through the arch into the reinforced beam masonry area. Where cracks have appeared above the opening, they can be stitched with shorter ties, and the cracks can be filled with injections of a special low-viscosity filler.