To reduce the chances of mold and mildew, try to stay away from wood siding and porous materials such as stone and brick.
All of these materials allow for moisture to be trapped and allow mold to grow, especially on the northern-facing and shaded sides of the home.
Stucco has its own considerations and problems associated if it is not installed properly.
If you choose stucco, it should be installed as a water-managed system. This type of system incorporates underlayment, which acts as a drainage plane beneath the stucco. At the bottom of the walls and over windows and doors weep termination strips are installed to allow any moisture built up beneath the stucco to properly drain out. This reduces the chance for mold and mildew as well as rot associated with constant wetting of the wood framing.
Rainscreen panel siding system
An alternative consideration for you would be to install a Rainscreen panel siding system.
Many of these panels are manufactured from waterproof materials or sustainable recycled materials such as "Eco-Clad" by Kliptech Industries.
I suggest this solution for the following reasons:
- Will not require routine maintenance such as painting.
- Will not crack and allow water infiltration like stucco.
- Allows moisture to evaporate below its surface, eliminating mold growth.
- Allows moisture to freely drain.
- Acts as an additional layer of insulation by reducing heat gain.
- Prefinished at point of manufacturing.
- Aesthetically pleasing.
- Cost-competitive with stucco or stone.