Onduline is one of the most popular bituminous corrugated roofing sheets. Onduline roofing sheets are easy to handle and simple to fix, requiring no specialist trade skills or equipment. Onduline corrugated roofing sheets is one of the most lightweight roofing material.
For determining beam spans (distance a beam can span between supporting posts), consider the following concept. The more weight, or the longer the supported length of joist that a beam must carry, the shorter the span of the beam – for a particular size of beam.