It is important to detail in such a way that workers can reach the work easilv.

1. For maximum comfort and productivity, a worker should be standing on a level, secure surface, working between waist height and shoulder height, within a couple of feet of the front of the body. This ideal is readily achieved in a factory, but it is more difficult to achieve on a construction site. Overhead work is fatiguing, as is work that requires stooping or squatting. Excessive reaches are bad, because they put the worker dangerously off balance; they are also likely to result in less-than-perfect workmanship.

2. Cladding that is designed to be installed from inside the building saves money on scaffolding and generally results in high worker productivity and optimal workmanship.

3. Good scaffolding or staging with guardrails is the next best thing to standing on a level floor. A hydraulic bucket or a short stepladder would be nearly as safe and comfortable as scaffolding. A straight ladder or a very tall stepladder is more precarious than any of the foregoing means of support and also leads to lower productivity because of the difficulty of moving the ladder and the time it consumes. The least desirable means of worker support is a seat harness suspended on ropes—it is relatively dangerous, productivity is low, and good workmanship is hard to achieve. Detailing can sometimes take these differences into account by avoiding finicky work in awkward places, prefabricating assemblies that would be difficult to fabricate in place because of precarious access, and placing fasteners in locations that are easy to reach.

4. Avoid creating apparently logical details that cannot be assembled because of accessibility problems. This innocent-looking detail for attaching cladding panels to a masonry backup wall will not work, because there is no

0 0

Post a comment