There is provided a ventilating sill plate for elevating a wall portion from a receiving surface. The ventilating sill plate comprises at least one longitudinal base having a first and a second face opposite the first face extending along a longitudinal axis, the first and the second face extending laterally perpendicular to the longitudinal axis between a first and a second lateral side. A plurality of longitudinally spaced support legs extend away from the second face and define at least one ventilating channel extending from the first to the second lateral side of the at least one longitudinal base. A plurality of support pads project from the first face and collaborate for supporting the wall portion. A plurality of longitudinally spaced arms are shaped and sized to receive the wall portion therebetween.