Abstract: An expansion jointing material for placing concrete, mortar or the like which comprises a jointing material of elastic substance and a cover member placed over the jointing material and extending in the longitudinal direction thereof. In operation, a plurality of the jointing materials are preliminarily positioned and adjusted to a predetermined height along the partition lines to form a plurality of partitions into which concrete, mortar or the like is deposited to produce laid surfaces of concrete or the like using the upper portions of the cover members as the reference levels. The jointing materials are completely buried in the concrete, mortar or the like except the upper portions of the cover members to absorb or compensate for the expansion or contraction of the concrete, mortar or the like.