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Siding underlayment varies based on the type of material, but most siding is installed on top of a vapor barrier, a moisture-resistant house wrap, sheathing made from plywood or oriented strand board (OSB), and a layer of insulation sheeting. Having the correct underlayment is a critical part of properly installing siding and will protect your home from water intrusion, structural damage, and energy loss.

To calculate how much siding you need for exterior walls, first measure the height and width of the rectangular walls. For the triangular gable walls, measure the width and then the height from the ground to the tallest gable point.

• For the rectangular walls, the calculation is: length x height

• For the triangular gable walls, the calculation is: (length x height) / 2

Once you add these up, include an additional 10% to account for any wastage.

Vinyl siding will fade slowly over time but will likely be most noticeable starting 10–15 years after installation. This timeline varies based on factors such as the climate where you live. In areas with more extreme hot or cold conditions, vinyl is likely to fade more quickly.

Stucco siding is the most energy-efficient option on its own, but you can choose insulated vinyl, insulated metal, or insulated brick or stone facade siding that improves energy efficiency even further. These options include a layer of foam insulation under the siding to reduce heat transfer between your living space and the exterior. If you live in a particularly sunny climate, a reflective option like insulated steel or aluminum siding can maximize efficiency.