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The 2015 International Residential Code (IRC) does not require you to remove the existing deck material prior to installation of a new sheathing substrate except in very unusual circumstances where the existing roof framing is inadequate. Roof replacements do require the removal of all existing layers of roof covering (shingles).
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It depends, as this requirement comes from a change in shingle manufacturers’ installation instructions. Some, not all, shingle manufacturers now state (in their instructions) that their product cannot be installed on solid lumber sheathing wider than a 1x6. This is due to the possibility for expansion/contraction of the deck boards wider than a 1x6. The code does state that new roof covering material (shingles) must be installed in accordance with the manufacturers’ installation instructions. These instructions may also address the gap between boards and may require an overlay of OSB or plywood if the gaps are too wide.
Yes, per IRC section R905.2.8.5 drip edge is required for asphalt shingle installations. Drip edge must be installed in accordance with the manufacturers’ installation instructions.
If the chimney measures more than 30 inches wide, perpendicular to the slope, then a cricket is required per the IRC section R903.2.2.
All requirements of the code are enforced and in effect even if a specific permit or inspection are not required.
No, currently it is not specifically required by code unless mandated by a shingle manufacturers’ installation instructions for certain applications.
Yes, multiple code approved options are available per IRC section R905 for asphalt installations.