4. Building roof drains should be capable of removing at least 3.25 inches per hour of rainfall from the roof. The roof framing system should be able to support the maximum build-up of water that could accumulate if the primary drainage system is blocked. In other words, the roof strength needs to sufficiently withstand the weight of retained water that cannot be handled by normal drainage until the emergency drainage comes into play. 5. A copy of the FM Global Form 2688 “Contractor’s Application for Acceptance of Roofing System” should be submitted along with any roofing submittal.
New Roof Plan Submittals
New roofing plan submittals should, at minimum, consist of the following items: 1. Structural Prints - These should include information detailing roof installation, flashing installation, and roof loading design (both live and dead load). 2. Roof Drainage System - Drawings should clearly indicate drain sizes, locations with respect to building columns, and the number of drains to be installed for both primary and emergency drainage. It is recommended that roof drainage calculations are included in the plans. 3. Snow Loading Calculations - When applicable, these should be submitted to ensure that the average snow load due to an unbalanced snow load does not exceed the design live load of the roof. 4. Wind Uplift Rating - The uplift rating of the roofing system should be specified to ensure that it is properly designed to withstand the anticipated uplift pressures. a. Materials (manufacturers, model and size for insulation boards, vapor barriers, adhesives, membranes and any other component of the system). b. Roofing System c. Fastening (manufacturer’s name, model, and proposed fastening rate/density). 5. Specific Flashing Details 6. Roof Specifications for
Re-roof and Re-cover Projects
Submittals for re-roof and re-cover projects should include the information listed above, as applicable. However, in many cases drainage calculations and structural plans will fall outside the scope of a re-roof or re-cover project. If the new roof assembly differs from the original assembly, it should be verified that the building design loads are not exceeded. Re-roof and re-cover projects should adhere to the general roofing guidelines listed above and consist of a non-combustible or Class 1 rated assembly, approved by FM for the specific application (i.e. re-cover or re-roof).
9
Return to Table of Contents
Made with FlippingBook flipbook maker