A suspended roof almost inevitably necessitates penetration of the waterproofing layer of the building fabric. However, a typical industrial building with a conventional internal structure has a number of penetrations for rainwater outlets, smoke vents, flues, etc. Thus, it is a change in the 'size' of the penetration, rather than the nature of a new problem. In practice, it is found that leaks occur most often at rainwater outlets and parapets. In contrast, it is relatively straightforward to design a waterproofing detail for a column or hanger penetration.

In order to make the detailing as simple as possible, the primary structural connections of an external structure should be located outside the building envelope, and penetrations minimised. Where tie rods pass through the roof, it is difficult to dress the waterproofing around such small members. In this case, it is often necessary to provide a shroud for the waterproofing to tuck under, as shown in Figure 10.1.

Rabbeted Oblique Splice
10.1 Waterproof shroud used in roofing
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