<p>A patch system for a wall structure comprising first and second walls in which the first and second walls are supported a fixed distance from each other and a hole to be patched is formed in the first wall. The patch system comprises a patch structure having at least a first and second surface portions and us arranged between the first and second walls such that the first surface portion of the patch structure engages the second wall and at least a portion of the second surface portion of the patch structure engages the first wall.</p>
