Minnesota Roofing Inspection

Requirements

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What's more important: Manufacture's specifications or State Code?

Where is ice and water shield supposed to go?

How many layers of roofing can I have?

What kind of flashing do I use for : valley, wall lines, chimney?

Is my wood good?

Can I use staples or do I need to use nails?

How many vents do I need?

Complete 2007 Minnesota State Code

    

Manufactures specifications: Roofing shall be secured and fastened to the supporting roof construction and shall provide weather protection for the building at the roof.  Roofing products shall be installed per the manufacture's installation instructions or Minnesota state code requirement whichever is more restrictive. You can find manufactures instructions on the back of shingle products packages or from the material supplier.

Underlayment & Ice and water protection: Entire state of Minnesota requires special eave protection an ice barrier that consists of at least two layers of Underlayment cemented together or of a self-adhering polymer modifieded bitumen sheet, shall be used in lieu of normal Underlayment and extend from the eave's edge to a point at least 24 inches (610 mm) inside the exterior wall line of the building. The code in Minnesota requires this special waterproof shingle Underlayment at the eaves or lower edges of the roof.

Ice and Water Shield In Valleys: Valleys shall have a 36-inch-wide (914 mm) Underlayment of either one layer of Type I Underlayment running the full length of the valley, in addition to other required Underlayment, or a self-adhering polymer modified bitumen sheet complying with ASTM D 1970.

Ice and Water Shield Manufacture Recommendations: Around all Penetrations, At the intersection of walls, And intersection of Pitch changes.

Roofing Felt - Tar Paper: The code requires that Underlayment of one layer of non-perforated Type 15 felt lapped two inches horizontally and four inches vertically to shed water

Layers Allowed: R907.3 Re-covering versus replacement (reroofing asphalt shingles). Hail exposure map has been revised. Complete shingle and Underlayment tear-offs are required when reroofing in the following Minnesota Counties (from Figure R903.5 Hail Exposure Map):

Anoka MN

Benton MN

Blue Earth MN

Brown MN

Carver MN

Chisago MN

Chippewa MN

Clay MN

Cottonwood MN

 

Dakota MN

Dodge MN

Goodhue MN

Hennepin MN

Isanti MN

Jackson MN

Kandiyohi MN

Le Sueur MN

Lincoln MN

 

Lyon MN

Martin MN

McLeod MN

Meeker MN

Mille Lacs MN

Murray MN

Nicollet MN

Nobles MN

Norman MN

 

Olmsted MN

Pipestone MN

Ramsey MN

Redwood MN

Renville MN

Rice MN

Rock MN

Scott MN

Sherburne MN

 

Sibley MN

Stearns MN

Steele MN

yellow Medicine

Wabasha MN

Waseca MN

Washington MN

Watonwan MN

Wright MN

 

Flashing Requirements: Existing flashings may be re-used provided it has no holes and is serviceable. Under no circumstances may (tar) or other asphalt material be used in lieu of metal flashing. (WE REPLACE ALL ROOF FLASHINGS WITH NEW)

Roof Decking:  Asphalt shingles shall be fastened to solidly sheathed decks or 1 inch thick nominal wood boards  When old roofing materials are removed, the original roof boards are often found to be spaced; this was and still is permissible for wooden shakes . However , this creates a fastening problem, as the space between the boards does not allow nailing at all locations of the roof. Any roofs with spaces greater than ˝ inch must be corrected.  (1/2" is Open to Interpretation Code specifically states solidly sheathed) Approved methods are :

Fasteners:  Fasteners for asphalt shingles shall be galvanized steel, stainless steel, and aluminum or copper roofing nails, minimum 12 gage (0.105 inch (2.67 mm)) shank with a minimum 3/8 inch (9.5 mm.) diameter head, ASTM F 1667, of a length to penetrate through the roofing materials and a minimum of 3/4 inch (19.1 mm) into the roof sheathing. Where the roof sheathing is less than 3/4 inch (19.1 mm) thick, the fastners shall penetrate through the sheathing. Fasteners must comply with ASTM F 1667. Staples are not permitted for shingle application unless specifically noted in the manufacturer’s installation instructions on the shingle package.

Venting attic space:  Roof ventilation is required. Enclosed attics and enclosed rafter spaces formed where ceilings are applied directly to the underside of the roof rafters shall have cross ventilation for each separate space by ventilating openings protected against the entrance of rain or snow. Ventilating openings shall be provided with corrosion-resistant wire mesh, with 1/8 inch (3.2 mm) minimum to 1/4 inch (6.35 mm) maximum openings. Minimum area: The total net-free ventilating area shall not be less than 1:150 of the area of the space ventilated exempt that the total area is permitted to be reduced to 1:300, provided at least 50 percent and not more than 80 percent of the required ventilating area is provided by ventilators located in the upper portion of the space to be ventilated at least 3 feet (914 mm) above eave or cornice vents with the balance of the required ventilation provided by eave or cornice vents. As an alternative, the net free cross-ventilation area may be reduced to 1:300 when a vapor barrier having a transmission rate not exceeding one perm (57.4 mg/s-m2-Pa) is installed on the warm side of the ceiling. It might be necessary to add ventilation with your new roof to meet these standards. - If condensation problems exist in the attic, they too will be revealed when the roof is torn off. Properly designed attic ventilation can then be installed in order to help eliminate such problems.

Note: Above is part of the 2007 Minnesota State Code as well as 2006 IRC and/or IBC . Certain cities and towns may have additional requirements that may have to be met. Check with your local city hall.

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