# Roofing permit SF451243 at 320 Commonwealth Av, Boston

Boston Inspectional Services Department permit SF451243: issued Mar 5, 2015 for roofing work at 320 Commonwealth Av. -Dismantle and dispose of existing deck. -Consult Engineering -Remove and dispose of existing roof system down to existing wood decking. -Install new pressure treated wood nailer at perimeter to match height of new insulation that is to be installed. -Install 6mil poly plastic vapor barrier over existing wood decking to meet MA building code. -Install 3.5" Polyisocyanurate insulation. Insulation boards will be mechanically fastened with approved roofing plates and fasteners. -Install new Firestone.060mil black EPDM membrane over newly installed insulation. Membrane will be fully adhered with approved bonding adhesive. -Seams will be treated with an application of primer wash and a 3" butyl-based seam tape. -All projections ad penetrations will be flashed to new membrane with pre-molded flashing or an uncured flashing field wrap. -Wall membrane will be tucked up under existing metal coping and terminated with a 4" aluminum counterflashing. -Furnish and install new 16oz copper drip edge metal flashing at front and rear edge of the roof. -Provide manufacturer's 20 year warranty.

- Permit number: SF451243
- Issued: Mar 5, 2015
- Type of work: Roofing (city: Roofing, Short Form Bldg Permit)
- Status: Issued (city: Open)
- Reported cost: $40,005
- ZIP code: 02115
- All permits at this address: https://nearbypermits.com/boston/address/320-commonwealth-av/

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Source: Boston Inspectional Services Department permit data (https://data.boston.gov/dataset/approved-building-permits). Checked 2026-10-06 13:22 UTC. Nearby Permits, https://nearbypermits.com. JSON API and MCP server: https://nearbypermits.com/developers/

Every permit at 320 Commonwealth Av: https://nearbypermits.com/boston/address/320-commonwealth-av/