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Drew Martin <br />From: Drew Martin <br />Sent: Friday, March 17, 2023 8:34 AM <br />To: paul@northsoundrefrigeration.com <br />Subject: City of Everett Permit Services: 11825 Airport Road (M2303-038) - First Building Review <br />Hello, Paul. <br />This email briefly recaps our discussion. We need a roof plan. As we discussed, a plan can be created using an aerial <br />image. Please size on 11x17 to match the floor plan previously sent. Use a B&W image. Show the approximate size and <br />location of the rooftop units. Provide a brief description of the installation including the mounting and weight. Note <br />that calculations should be provided if the new unit weights are significant or otherwise placed in a location that could <br />have adverse effects on the building structure. Email the drawing directly to me. Make sure to respond to this email so I <br />have the project number for reference. <br />Here are the standard general mechanical comments that I mentioned for your future use (FYI only, no specific action <br />required for this permit application): <br />The construction drawings should be prepared considering the following: <br />1. Verify that the existing unit was installed with a valid permit. Replacement of an existing unit that was not <br />permitted will require evaluation of the existing structure for the new unit. Depending on the age and <br />construction of the building, and the estimated age of the unit, this is something that can be discussed further as <br />a permit history on older units is often difficult to verify. <br />2. Where the existing unit has been installed with a valid permit, the drawings should include the weights of the <br />existing and new units, and demonstrate that the new unit does not increase the previously permitted lading <br />condition on the roof by more than 5%. The weight of all accessory components (e.g., mounting curbs, <br />operating weight with fluid, etc.) should be included. If the load increase exceeds 5%, a structural analysis of the <br />supporting framing is required. See 2018 IEBC Section 706.2. <br />3. If installation of the unit requires substantial structural modifications to the supporting framing, a building <br />permit will be required. The application should include drawings and calculations for the proposed <br />modifications. Minor modifications (e.g., blocking between existing framing, curbs, sheathing penetrations that <br />do not cut framing members) may be performed within the scope of the mechanical permit application. <br />4. If the unit is suspended, details and calculations for the gravity supports and lateral bracing of the unit is <br />required if it exceeds 20 lbs. See IBC Section 1613.1 and ASCE 7-16 Chapter 13. <br />5. Details will be required when penetrating fire -rated assemblies; the applicant is responsible to evaluate the <br />building and determine the Construction Type of the building per IBC Section 601, and the locations and ratings <br />of assemblies. Penetration details should be provided for the rated assemblies per IBC Chapter 7. <br />6. The drawings should list additional required permits as follows: <br />a. A Plumbing permit is required when the unit requires connection to the plumbing system(s), such as <br />water supply and/or discharge lines connected to an HVAC unit. <br />b. An Electrical permit will be required for work involving components that are hardwired to the building's <br />electrical system. <br />Be aware that Type I (and II?) hoods require a separate Mechanical permit application in the City of Everett. <br />Please let me know if you have questions. <br />