My barn has large timber 'A' frames supporting the roof. Most of the A frames rest on timber wall plates on top of solid stone walls. But one A frame rests on two timber lintels placed over the window openings. These timber lintels are 3 inches deep, 8 inches wide, and 66 inches long. The clear span is 36 inches. Both lintels are sagging under the weight of the A frame which is placed exactly in the middle of the clear span. I want to replace the timber lintels with reinforced concrete ones. Two standard 1.8 M, 100mm wide by 65mm depth concrete lintels would fit. But I have no idea if the concrete lintels will do the job, as they will simply be resting on top of the stone wall either side of the window opening, and will have to support a point load in their centres.
Anyone know if this will be ok?
Anyone know if this will be ok?