b'Once the design is ready, the project must be tendered and awarded. The typical tender period varies based on the clientsSNOW REMOVAL IS AS EXPENSIVE AS IT IS LABOUR process. For private clients, it can be as short as three to four weeks (two weeks to tender and one to two to award a contract).INTENSIVE. IT CAN TAKE THREE OR FOUR ROOFERS OUT OF For others, it can take much longer. Public clients, for example, have regimented tendering and award processes, which can take up the full 60- to 90-day period of irrevocability (i.e. the amountA TYPICAL SIX-PERSON CREW TO UNDERTAKE THIS TASK, of time the bids remain open) before the acceptance of the bid bypurchasing,councilorsimilar.ThisisinadditiontotheAND MORE IF THE SNOWFALL IS HEAVY.two- to four-week tender period.Once awarded, contractors must schedule this work within their production schedules. If a contract is awarded late in theProtective Roofing construction season, it may take anywhere from four to six weeks for contractor mobilization to occur. As winter comes, contrac-tors will also likely have other existing project commitments that are also weather dependent. Depending on available forces, thisSafety Productscan further defer the start on a new site.The speed of construction varies based on elements such as location, access, obstructions, services and roof assembly type. For new construction, roofing crews can move relatively quickly, as they do not have any removals to contend with. However, on reroofing operations, crews are only able to remove as much of an area as they can make watertight. Again depending on theBYaforementioned factors, a crew of six may only be able to remove and replace an average of 15 squares a day where one square equals 9.3 m 2(100 sf). Therefore, from the time the request is made to design a new roof, it may take approximately 19 to 24 weeks from the start of the project (i.e. design) to completion.In these authors experience, if the project does not need to be rushed, better pricing can be obtained by designing the work in the fall and early winter and tendering at the beginning of the year as contractors line up projects for the upcoming construc-tion season. This is usually the right decision for quality, sched-ule, cost and roof system flexibility.Conclusion The PR 100 Guardrail SystemThe intent of this article is not to dissuade design/construc-tion professionals from doing a roofing project over the winter.is an efficient and practical perimeter guardrail that allows youHowever, one must be aware of the additional challenges, sched- to work right to the edge of the roof.ule implications and costs. It can be done, and these authors Meets and exceeds OSHA & WCB requirementsfirm has been involved in many successful roofing projects car-ried out over the winter. Similarly, the team has also been in Accommodates: parapets and cant stripsEasy to installsituations where, in consultation with the client and contractor, Provides unobstructed access to roof edgework has stopped until weather conditions improve to ensure the final product is not compromised. This is not an ideal situa-tion, as it leaves the owner with a partially completed building. However, if the team, working together with the owner, deter-mines the risks are too great, then the right decision may be to hold off on roofing until warmer weather arrives.Note1 Thisnumberisderivedfromwww.eldoradoweather.com/ canada/climate2/Kapuskasing.html.Ted Katsoris is a practice lead in the Building Science Group of Build- The PR 600 Mobile Fall Protection Systeming Specialty Services at Morrison Hershfields Markham, Ontario office. Since joining Morrison Hershfield in 2004, Katsoris has overseen morecan be moved along the roof by pulling the cart to the desired working location, than 800 projects. He brings more than 30 years of combined contractingproviding a safe working area. The PR 600 meets O.S.H.A. compliance 1926.502D.and consulting experience to any project he undertakes. Katsoris also has extensive experience in the fields of building science and building enve- Roofing & Sheet Metal Super Service Centreslope repair/rehabilitation, as well as contract administration. He can be reached via email at tkatsoris@morrisonhershfield.com. EDMONTON, AB CALGARY, AB WINNIPEG, MB WESTON, ONDerrick Moore is a principal and senior building science consultant(780) 432-2786 (403) 255-8236 (204) 338-7613 (Weston Road)for the Building Specialty Services Group at Morrison Hershfield. Moore project manages and is actively involved as a building science consultantBARRIE, ON HAMILTON, ON TORONTO, ON (416) 745-4111on a wide variety of building envelope assessment and restoration projects.(705) 792-6683 (905) 560-2858 (416) 534-8421 WESTON, ONHe can be reached via email at dmoore@morrisonhershfield.com. OAKVILLE, ON PICKERING, ON LONDON, ON (Signet Drive)ThisarticlewasoriginallypublishedintheJanuary2019 issue of Construction Canada, and is reprinted with permission from(905) 825-0034 (905) 426-4443 (519) 668-3626 (416) 744-2050Construction Specifications Canada. www.sparmarathon.caORN THE ONLY SOURCE FOR PROFESSIONAL ICI ROOFING CONTRACTORS IN ONTARIO ONTARIO ROOFING NEWSISSUE 3 201911'