Page 104 - Demo

ROOF PREPARATIONJULY 2025Westform%u2019s Prolok 12 & 16 profile can be used in both new and old construction. We recommend Prolok be installed over a solid substrate, installation over strapping is possible. The following steps should be taken to prepare the roof for installation of any roof panel.1. Make sure there are no nails or other objects that might puncture the underlayment of the roof panels.2. Check/plan all details for possible roof penetrations whichmust be added to the roof prior to roof panel installation. (vented ridge/vented end wall - plumbing stacks) 3. Cover the roof deck with underlayment, overlaying 6%u201d, check manufacturers installation manual for underlayment. When installing over strapping, run the underlayment parallel with the metal panels, making sure that the underlayment is tight.4. Snap a chalk line along the gable end where the first panel will be installed. This line should be the width of the panel + 1/2%u201d away from the edge of the roof and square with the eave. Use the 3-4-5 method to square the roof. Use the largest 3-4-5 increments that will fit on the roof plane. 3-4-5 Right Angle Squaring MethodEXISTING ROOFIn some cases metal roofing can go over existing roofing. For those roofs use 1 x 4 strapping on 16%u201d O.C. screwed through to the rafters. The minimum pitch for Prolok 12 & 16 is a 2/12 pitch. 1. Remove moss and debris, inspect the roof for damage, make any necessary repairs, secure any warped or loose sheeting.2. Remove current venting and prepare for continuous profile ridge venting. 3. Screw down 1 x 4 on 16%u201d O.C.4. Install underlay parallel with the panels, making sure the underlayment is tight.3-6-94-8-125-10-15900