Скачать или смотреть 100+ Year Old Dairy Barn Straightening: Sills and Roofing

Barn roof had 30+ year old interlocking asphalt shingles over the original sawn cedar shingles installed in 1915 at the point I moved here in 1998. No major signs of roof leakage until after a severe west-wind driven hail storm around 2000 fractured the asphalt layer, with most damage at the transition in pitches on the west side.

Soon realized that steel roofing was the only reasonable alternative from a cost /utility basis but that the rigidization of the roof plane by screw-fastened steel panels would preclude future repair of rotted /sunken foundation -top wood sills and preserve the undulations of its roof eave-line.

Video shows the result of this process of lifting walls from the upper sill -at the roof transition-and replacing 20 foot segments of rotted foundation sills (due to condensation of moisture on cold surfaces from dairy cow confinement). Hydraulic 1.5 and 3 ton bottle jacks bolted to flanges welded on lally columns were based on the inner 6 inches of the 16 inch wide concrete foundation with the actuating end at 2 locations along each of 2 , 10 foot beams to lift a 20 foot wall section -with the beam bearing on temporary "jacks" bolted to studs and roof rafters. The replacement sills were applied in 3 layers of 2 inch rough sawn local pine or tamarack atop thinset mortar pads on the original poured concrete wall/foundation. The bottom 10 inch wide member was wedge anchor fastened to the concrete adjacent to pads every 2-3 feet. The middle layer consisting of 2 each 4 inch wide members was thru-nailed to the bottom layer with the outer edges flush with the bottom layer, creating a cavity in the center to provide clearance for the wedge anchor heads. The top layer of another 10 inch wide member was again thru-nailed into the lower layers. Severely rotted 2 by 6 inch studs were "sistered" with new ones adjacent to them and toe-nailed to both top and bottom sills. Severely rotted barn mow floor joists that could not bear on the wider new sills were replaced or sistered with new ones alongside. The full-round timber truss members were fasted to new sill segments by 1/8 by 1 inch steel flat straps and 3/8 inch lag screws. In total over 100 feet of sill out of a total of 200 was replaced by this process.

The wall section above the 12 foot opening for dual-doors and utility door was essentially made into a unitized header by using deck timber screws to fasten 2 by 10 lumber over the lower 2 feet of the wall -both sides. The original construction had only the 6 by 6 inch sill carrying the load of the wall and roof over a 7 foot unsupported span. Over the years this segment had sagged at least 4inches and siding had twisted and split.

Farm Beef Website: haycreek.net