beam 30 in a preferred embodiment as illustrated the post member 40 is an i shaped beam the post member 40 has an upper end 42 and a lower end 44 the lower ends 44 of the post members 40 form the periphery 46 of the roof 10 sheeting panels 48 serve as a covering for the roof 10 the sheeting panels 48 are preferably made of steel they can also be made of any other suitable material such that the panels have sufficient strength and are impermeable such as corrugated tar paper panels and the like the sheeting panels 48 are secured to the upper surface 38 of the roof 10 in a preferred embodiment the sheeting panels 48 are secured by means of screws to the support beams 36 plate members 50 having low frictional surfaces are secured to the lower end 44 of the post members 40 in a preferred embodiment the plate member 50 is made of polyethylene such as uhmw polyethylene the plate members 50 minimize the lateral forces which will be transmitted from the roof 10 to the manure storage tank 12 as seen in fig5 the lower ends 44 of the post members 40 are secured to the storage tank 12 by means of brackets 52 which will prevent the roof 10 from lifting off the storage tank 12 the.