Our welded and bolted portal frame shed is not only one of the few left on the market but we are sure its absolutely the strongest design available. We have designed the shed from the ground up so we were not restricted by design like the major brand shed companies are. If we see something that works better than we have already we would immediately be able to change our design to incorporate it. Therefore we are sure we have the strongest shed on the market! We use galvanised steel stirrups set into the concrete slab and bolt our columns to them with four Mondo bolts on each column. We use welded plates to attach our columns to our Rafters and again have welded plates attaching the rafters in the centre top of the shed, each attached with two 16mm bolts. All of the steel used in our shed is Bluescope Australian steel.