Monitor your eaves.

Your eaves are very prone to moisture and termite damage. This is the last place water runs off your roof, and if the water is not running off correctly, it may be collecting water and damaging your home, like in this picture.

Also, have you ever noticed when it starts to heat up, termites grow their wings and start flying around? Guess where they go? The eave is usually the easiest access and they love pine, which is typically the wood that your eave boards are made of. So the next time it heats up, pay close attention to those things flying around that look like ants with wings. If they are searching around under your eaves, chances are, they're not flying ants!

What's your water pressure?

Do you know what the water pressure to your home is? Too much and you can cause damage to your fixtures in your home. Too little and your standing under the shower waiting. The latter is obvious. The former can be damaging. According to the literature I have read, you need to keep it under 85 psi. 70 psi should be a comfortable pressure.

Monitor Wood Structures

Fortunately, this wood band was the only part rotten. Should it have traveled into the post, this person would have a structural problem, not just an aesthetic one

Reseal your deck

Throw a bucket of water on your decking to see if you need to reseal. If the water beads up, then your sealant is still working. If the water is absorbed by the decking, then it's time to get some sealant. A deck that isn't sealed properly is vulnerable to the elements and may experience rotting, warping and splitting. Performing routine maintenance is far cheaper than replacing the deck so make sure you keep your decking in tip-top shape.

--LIterature by Kudzu
--Photo by My San Diego Home Inspector

Inspect your roof (or contact an inspector)

After a long, harsh winter, your roof may be in need of a little TLC. Common problems include chipped, curling or missing shingles... and each should be identified and corrected as soon as possible. Damaged shingles can lead to serious leaks which can cause thousands of dollars in damage to the interior of your home. Getting on your roof to perform an inspection can be dangerous, so contact a professional roofer (or inspector) or use binoculars to conduct a visual inspection from the ground.

--from Kudzu website

Clean gutters and downspouts

Your home's gutters play an important role in directing water away from your house, but they are highly ineffective when clogged with leaves and other debris. Clogged gutters and downspouts can lead to foundation problems and cause water damage...both could cost you thousands of dollars to repair. The standing water left in your gutters can also serve as a breeding ground for mosquitoes.

--Kudzu website