b'jacket is of a type that would be suitable for the specific siteCONCLUSIONconditions, especially in situations where high water table/ Once construction is complete, exterior access to the below-grade hydrostatic pressure is present; water sealing of the seams of thepipes for future repair poses a significant cost for end users in jacket demands special attention and the involvement of theaddition to the associated disturbance. Therefore, incorporating a pipe manufacturer. Furthermore, necessary protective measuresholistic and long-term approach to the waterproofing of below-need to be implemented to ensure the jacket is not damagedgrade pipes is of utmost importance. To achieve this objective, during transportation, backfilling, etc., since any potentialit is recommended that the building envelope consultants and damage could pose the risk of water ingress.architects:aim for design solutions that incorporate at least two lines of Alternatively, similar to scenario 1, it would have been ideal to have the below grade waterproofing extended onto the actualdefence (preferably three) against water ingress;pipe in scenarios 2 and 3 (Photo 12); however, in the case of pre-insulated pipes, that would require removing sections of theperform the required coordination measures between the pipe insulation and the jacket, thus altering the pre-insulatedvarious disciplines, in particular the mechanical engineer, pipe system. This is something that is generally not supportedbelow-grade waterproofing manufacturer andpipe manufacturer;by the pipe manufacturers and the mechanical engineers.request mock-ups in the presence of all the relevant disciplines Nonetheless, even assuming that extending the waterproofing onto the actual pipe would be achievable in this case, thatto ensure the design intent is properly comprehended; andwould not change the fact that additional waterproofing wouldperform periodic field reviews of the waterproofing detailingstill be needed onto the jacket itself to protect the insulationduring construction.and the pipe. In doing so, it should be noted that if incidentalThe B.C. construction industry benefits from a wide range of water manages to bypass the jacket, it can potentially getbelow grade waterproofing systems and products, deep knowl-trapped between the jacket and the pipe (accumulated on theedge of building envelope discipline and a vast amount of low-slope side of the pipe system) and cause damages to theexperience developed due to the significant amount of construc-pipe, such as the excessive corrosion seen in Photo 3. Therefore,tion, especially over the last decade. Under these circumstances, when it comes to pre-insulated pipes, it may be optimum toholistic long-term solutions can be easily achievable. Collectively, only achieve the waterproofing continuity onto the jacket, butit is our responsibility to take ownership for turning the common then ensure that the jacket would be a durable and waterproofoccurrence of water ingress from around the below-grade pipes to type and well-protected during transportation, backfilling, etc.a rare occurrence.LOOKING TO CONSTRUCT YOUR IMAGE? WERE HERE TO HELP!Robert Thompson, Senior Vice President robertt@mediaedge.ca 647-494-4229SPRING/SUMMER 2024 19'