If your local building authority has a rafter spacing code you may not space rafters wider than required by code.
Minimum roof sheathing for n c residential.
Roof sheathing installation 1 of 3 home builder s guide to coastal construction technical fact sheet no.
Rafters must be strong enough to hold the roof sheathing and the shingles.
The international codes i codes are the widely accepted comprehensive set of model codes used in the us and abroad to help ensure the engineering of safe sustainable affordable and resilient structures.
Roofs shall be covered withmaterialsassetforthinsectionsr904andr905 classa b or c roofing shall be installed in areas designated by law as requiring their use or when the edge of the roof is less than 3 feet 914 mm from aproperty line classesa bandcroofing requiredtobelistedbythissectionshallbetestedinaccordance with ul 790 or astm e 108.
North carolina state building code.
Fasteners for asphalt shingles shall be galvanized steel stainless steel aluminum or copper roofing nails minimum 12 gage 0 105 inch 3 mm shank with a minimum 3 8 inch diameter 9 5 mm head complying with astm f1667 of a length to penetrate through the roofing materials and not less than 3 4 inch 19 1 mm into the roof sheathing.
Energy conservation code ncecc 301 n.
N fastener spacing.
The typical thickness range for sheathing is 3 8 to 3 4 inch.
The international code council icc is a non profit organization dedicated to developing model codes and standards used in the design build and compliance process.
Wilmington street suite 450 raleigh nc 27601 1058.
N sheathing loss is one of the most common structural failures in hurricanes.
Never attach roof sheathing with staples.
Loads will vary with the.
Walls need to be insulated to a minimum of r 20 if the insulation is between the studs or r 15 r 5 if the insulation is a combination of insulation between the studs and a continuous layer of exterior insulation in zones 3 or 4.
8d ring shank nails should be used instead.
Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame.
Typical rafter spacing codes will specify a minimum spacing of 16 inches 19 2 inches or 24 inches.
That will suffice on a roof with rafters set 16 inches apart with minimal roof loads.
Sheathing should be a minimum of 19 32 inch thick.
Roofs or ceilings need to be insulated to a minimum of r 38 in zone 3 or r 49 in zone 4.
Designer of record is responsible to ensure all roofing projects conform to the minimum requirement of the code.
