A cover layer for a vacuum wound therapy dressing includesa backing layer formed from a flexible polymeric membrane and anadhesive layer for affixing the backing layer over a wound bed to provide asubstantially fluid-tight seal around a perimeter of the wound bed. Thecover layer is reinforced with a reinforcement layer extending to a peripheralregion of the backing layer to distribute forces associated with evacuatinga reservoir, as defined by or within the cover, to stimulate healing ofthe wound bed.