Window Riser Blocks & Cavity Locking Wedges

Run Up Riser Blocks cause the opening sash to be lifted up into place as it closes into the outer frame in cases where the opener has or is starting to drop or move downwards. The cavity locking wedges tightly pull the hinge side of the opener into the frame and up to the gaskets producing a tight weather seal. The idea is that as the sash is forced onto this block the tapered wedge shape of it make it lift up into place so enabling the lock points to be forced into the correct position. This then enables them to operate and lock without causing undue stress to the locking parts and hardware ensures the opening vent sash is guided into the outer frame to close correctly.