Minimum Roof Insulation Thickness Ibc

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.

Minimum roof insulation thickness ibc.

Astm a792 az 50. Cap flashing shall be corrosion resistant metal of minimum nominal 0 019 inch 0 5 mm thickness. 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. For pre formed metal shingle systems.

R value based method of section c402 1 3 u c and f factor based method of section c402 1 4. 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. In some regions however local weather may dictate roof pitch. Aluminum zinc alloy coated steel.

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. Specific insulation requirements of section c402 2 thermal requirements of either. Astm b209 0 024 inch minimum thickness for roll formed panels and 0 019 inch mini mum thickness for press formed shingles. The pitch of your roof is generally determined by the span of the sidewalls and the desired roof height.

Astm b370 minimum 16 oz sq. 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. 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. High yield copper for metal sheet roof covering systems.

Where the roof sheathing is less than 3 4 inch 19 1 mm thick the nails. 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. 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.