Residential Re-Roof Inspection Checklist

Utilize the Residential Re-Roof Inspection Checklist to check all elements for compliance with the 2018 International Residential Code (IRC).​

Residential Re-Roof Inspection Checklist



Plywood Or Oriented Strand Board (OSB) Sheathing

1. Has rot or delamination of existing sheathing or framing been checked?


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2. Is the span rating corrected based on the spacing of rafters or trusses?


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3. For sheathing less than 1/2-inch thickness placed over rafters spaced more than 20 inches on center, are plywood clips or blocked edges required? Typically, a 7/16-inch OSB with a span rating of 24/16 is used and will not require clips.


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4. Is the sheathing exposed to weather (underside of eaves) made of exterior grade glue (marked as "Exposure 1")?


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5. Has the minimum prescriptive nailing been ensured for sheathing, with 8d common nails (i.e., 0.131 inches by 2-1/2 inches) at 6 inches on center at supported edges and 12 inches on center in the field? Edge nail pattern also applies over gable ends and diaphragm boundaries.


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6. For sheathing cut into widths less than 24 inches, has solid blocking been provided at all panel edges?


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7. Are fastener heads or crowns prevented from penetrating the outer veneer of plywood?


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8. Has the sheathing been properly gapped at the edges as required?


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Ventilation Of Attic Or Rafter Bays

1. Is cross ventilation provided in all attics?


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2. Does the aggregate area of openings meet the requirements, which are 1/150 of the attic area?


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3. For cases where 40% to 50% of openings are in the upper portion no more than 3 feet below the ridge or highest point of the space, have the ratio requirements been reduced to 1/300?


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4. Has insulation been installed in a way that does not block the free flow of air where eave or cornice vents are present, ensuring a minimum 1-inch air space between the insulation and roof sheathing and at the location of the vent?


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Final Inspection

1. Have the roof coverings been properly installed, with fasteners installed as required for the type of roofing material and per the manufacturer's instructions?


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2. Have proper flashings been used to cover all exposed sheathing edges, and are there proper flashings and counter flashings at chimneys, skylights, and roof-to-wall transitions, as required for the type of roofing material and manufacturer's installation instructions?


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Permits And Plans

1. Are permits required for residential re-roof overlays in Bothell, Kenmore, and Snoqualmie? (Overlays occur when new roofing is installed over existing roofing.)


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2. For residential re-roofs involving structural elements, such as additions or modifications, roof sheathing, skylights, change of roof pitch, addition or relocation of mechanical units, or installation of heavier materials than were previously installed, are permits and approved plans required?


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3. Is the job address posted in a visible location?


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4. Are the permit and approved plans, when required, present on-site and accessible to the inspector?


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5. Is the permit information correct, including the address, permit number, description of work, etc.?


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General Re-Roof Requirements

1. For new roof coverings, are all existing layers of roof coverings removed when any of the following conditions exist: • The existing roofing is water-soaked or degraded to the point where it cannot provide an acceptable base for additional roofing. • The existing roof covering is wood shake, slate, clay, or cement tile. • The existing roof has two or more applications?


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2. When applying new roof covering over wood shingle or shake roofs creates a combustible concealed space, is the entire existing surface covered with gypsum board, mineral fiber, glass fiber, or other approved material and securely fastened in place?


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3. Are flashings reconstructed in accordance with the approved manufacturer’s installation instructions?


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4. Is the structural framework capable of supporting additional dead loads? (Pre-inspection is required for structural rafter/truss dimensions and spans.)


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5. Has the jurisdiction having authority been contacted for any other types of roof overlays?


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Roof Slope

1. Is the minimum roof slope for asphalt shingles 2:12? Is it ensured that roof slopes between 2:12 and up to 4:12 require double underlayment, as detailed in IRC Table ? See special installation requirements of the manufacturer and IRC.


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2. Is the minimum roof slope for clay and concrete tiles 2-1/2:12? Is it ensured that roof slopes between 2-1/2:12 and up to 4:12 require double underlayment as detailed in IRC Table 905.1.1(2)? See special installation requirements of the manufacturer and IRC. (R905.3)


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3. Is the minimum roof slope for metal roof shingles 3:12? See special installation requirements from the manufacturer and IRC.


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4. Is the minimum roof slope for mineral-surfaced rolled roofing 1:12? See special installation requirements from the manufacturer and IRC


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5. Is the minimum roof slope for slate and slate-type shingles 4:12? See special installation requirements from the manufacturer and IRC


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6. Is the minimum roof slope for wood shingles 3:12? See special installation requirements from the manufacturer and IRC.?


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7. Is the minimum roof slope for wood shakes 3:12? See special installation requirements of the manufacturer and IRC.


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8. Is the minimum roof slope for built-up roofing 1/4:12? See special installation requirements from the manufacturer and IRC.


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9. Is the minimum roof slope for lapped, non-soldered-seam metal roof panels 3:12? See special installation requirements from the manufacturer and IRC


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10. Is the minimum roof slope for standing-seam roof systems 1/4:12? See special installation requirements from the manufacturer and IRC.


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11. Is the minimum roof slope for modified bitumen roofing 1/4:12? See special installation requirements from the manufacturer and IRC.


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Roof Drainage

1. Are roofs sloped as required for drainage unless designed for water accumulation?


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2. Are roof drains installed at each low point of the roof unless sloped to drain over roof edges?


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3. Are roof drains sized and discharged according to the Uniform Plumbing Code?


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4. Are overflow drains sized the same as the roof drains, and are they installed with the inlet line 2 inches above the low point of the roof? Alternatively, are overflow scuppers installed with three times the size of the roof drains and a minimum opening height of 4 inches in the adjacent parapet walls, with the inlet line 2 inches above the low point of the adjacent roof?


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5. Do overflow drains discharge to an approved location and are not connected to the roof drain lines?


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Checklist by GoAudits.com – Please note that this checklist is intended as an example. We do not guarantee compliance with the laws applicable to your territory or industry. You should seek professional advice to determine how this checklist should be adapted to your workplace or jurisdiction.

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