2015 code requires walls to be insulated with a minimum of r 20 or r 13 5 13 5 means r 13 cavity insulation plus r 5 insulated sheathing.
Minimum roof insulation thickness ibc.
Fasteners for asphalt shingles shall be galvanized stainless steel aluminum or copper roofing nails minimum 12 gage 0 105 inch 2 67 mm shank with a minimum 3 8 inch diameter 9 5 mm head of a length to penetrate through the roofing materials and a minimum of 3 4 inch 19 1 mm into the roof sheathing.
Base flashing shall be of either corrosion resistant metal of minimum nominal 0 019 inch 0 5 mm thickness or mineral surfaced roll roofing weighing not less than 77 pounds per 100 square feet 4 kg m 2.
Base flashing shall be of either corrosion resistant metal of minimum nominal 0 019 inch 0 483 mm thickness or mineral surfaced roll roofing weighing not less than 77 pounds per 100 square feet 3 76 kg m 2.
If your community receives a lot of snow during the winter local building codes may require a minimum roof pitch for snow load which ensures that heavy snows will slide off.
Both codes provide specific instructions for re roofing projects and both are clear that replacements must comply with insulation r value requirements if the roof system is part of the building thermal envelope and contains insulation entirely above the deck.
For pre formed metal shingle systems.
Where the roof sheathing is less than 3 4 inch 19 1 mm thick the nails.
Aluminum zinc alloy coated steel.
In some regions however local weather may dictate roof pitch.
If structural sheathing covers 40 or less of the exterior continuous insulation r value shall be permitted to be reduced by no more than r 3 in the locations where structural sheathing is used to maintain a consistent total sheathing thickness.
Astm b370 minimum 16 oz sq.
High yield copper for metal sheet roof covering systems.
Astm b209 0 024 inch minimum thickness for roll formed panels and 0 019 inch mini mum thickness for press formed shingles.
Specific insulation requirements of section c402 2 thermal requirements of either.
R value based method of section c402 1 3 u c and f factor based method of section c402 1 4.
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.
Astm a792 az 50.
Cap flashing shall be corrosion resistant metal of minimum nominal 0 019 inch 0 5 mm thickness.
Or component performance alternative of section c402 1 5 roof solar reflectance and thermal emittance fenestration in building envelope.
