b'InsulationTheuserselectsinsulation next (Fig. 6). Options are poly-isocyanurate(LTTR[long-term thermalresistance]),expanded polystyrene(EPStypeII)and stone wool. For insulation, the R-value or LTTR are automatically provided using the NRCs Hygrothermal DatabaseMaterials.Theuser may input their own values, but the results will note this change.The user next selects the in-sulationdimensionsandthe number of insulation layers. Di-mension options are 4848 in.Figure 14: Increasing the insulation thickness.(1.21.2 m) and 4896 in. (1.22.4 m). Layer options are two and three layers. Then, the thicknesses of each insulation layer (top, middle and bottom in the case of three lay-ers)areautomaticallyselected tomeettheconditionsgiven by roof thermal design require-ments from Step 2, but without compensatingforthermalim-pact factors. The user can manu-ally alter the thicknesses.For the case study, the design layout uses two layers of polyiso-cyanurate insulation boards with thicknessesof1.5in.(38mm) (top) and 4 in. (102 mm) (bot-tom). The selected boards are 4848 in. (1.21.2 m) with an LTTR value of 5.64 ft 2F h/BTU (0.99 m 2 K/W) per inch.Vapour Barrier and DeckTheuserselectsthevapour barrierfromfouroptions:per-meablefelt,plasticsheet,two-plyfeltandasphalt,andself- Figure 15: Thermal design calculation results adhesive membrane. For the casesummary for the adjusted inputs.study, a self-adhesive membrane is selected as the vapour barrier (Fig. 7).The user also selects the struc-tural substrate (the deck). For the casestudy,theonlyoptionis metal deck. 87 Bakersfield St., Toronto, Ontario, M3J 1Z4 Tel: 416-787-0649Attachment Details Fax: 416-787-0640 Email: service@crawfordroofing.ca Thenexttaskistofinalizewww.crawfordroofing.catheattachmentdetails(Fig.8).Industrial Commercial Institutional Roofing Solutions First, the user selects the type of fastener (fastener diameter). Op-tions are #12, #14 and #15. This case study will use #14.Next,theuserselectsthe-PMI Programs- Modified Bitumen- Built Up Systems membrane sheet width. Because-Metal Roof Systems- Waterproofing- Restorationmodifiedbituminousmem- -Emergency Services- Roof Anchors- Single Ply branesaremanufacturedina-Roof Top Decks- Sheet Metal- Inverted standard sheet width dimension of 39 in. (1 m), the user in the case study has only one option toselect.Iftheselectedmem-branetypeissingle-plyTPO,Committed to Safety, Quality & Service for over 37 years PVC or EPDM, the options forServices Fully Bonded & Insured membranesheetwidthrange from 48 to 146 in. (1.2 to 3.7 m).ORN THE ONLY SOURCE FOR PROFESSIONAL ICI ROOFING CONTRACTORS IN ONTARIO ONTARIO ROOFING NEWSISSUE 1 202225'