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Generally, roof flashing is installed under the shingles to create a watertight seal and prevent moisture from seeping in and causing damage. However, the exact placement can depend on the type of flashing. For instance, with step flashing, the shingles and flashing overlap each other, meaning the flashing is technically both over and under the shingles. Flashing also typically goes beneath the house siding and is often not visible from the ground.

It’s possible to install your chimney cap in some areas, but it’s usually better to hire a professional. Before you attempt a DIY chimney cap installation, check to see if your local building department requires a permit. If it does, you should hire a professional to pull the permit and complete the work for you. Even if you don’t need a permit, getting up on your roof is dangerous, especially if you have an aggressive pitch or slippery roof material, like metal. Hiring a chimney professional guarantees the job is done correctly and keeps you safe from injury.

The minimum recommended slope for a porch roof is 1/4:12, which means 1/4-inch of rise every 12 inches of run. Slopes of 3:12 and 4:12 are more common and provide faster drainage for runoff. Make sure to choose a pitch that’s appropriate both for the climate in your area and the type of roof material you install. Hire a roofer if you need help determining what the right roof pitch is.

The proper specifications for furring strips can vary, so you should always consult the roofing manufacturer's guidelines or your roofer. However, general recommendations are as follows:

• Thickness: Furring strips are typically 1 to 1-1/2 inches thick, meaning standard 1-by or 2-by lumber works well. In areas with extreme winds, a thinner strip may be preferred to limit how much air can get under the roof and cause uplift. A thicker strip can add slightly more insulation but will also increase installation costs.

• Spacing: The recommended spacing for furring strips is between 12 and 24 inches apart on center. Proper spacing is crucial for ensuring good airflow, adequate drainage, noise reduction, and better energy efficiency. The ideal spacing can depend on the roof's pitch and the specific type of metal roofing being installed.