An important component of a home inspection that is not always obvious to the home buyer is the grading of the yard. I have seen homes that are meticulously maintained inside but have poor grading, even holes in the yard. Unfortunately, grading is often considered a low priority, but the effects of improper grading can be disastrous.
Rainwater ponding outside, or worse, running toward the house, can wreak havoc. Basements can flood, damaging items in the basement, as well as drywall, carpet and more. Even a slab-on-grade house with no basement is susceptible to water damage, as it could develop mold from water seeping into the walls, and the moisture could attract termites. Furthermore, standing water in cold climates can freeze and damage brick paver decking and other hardscapes.
The ideal grading that the home inspector should look for is for the ground to slope away from the house in all directions a half inch per foot. Other factors besides the slope of the ground can cause problems, including downspouts that disperse water right against the building, instead of directing it away, and vegetation that holds water and keeps it from draining away.
If the property looks like it has drainage problems, then the best way to know for sure is to check during or immediately after a rainstorm. When this is not practical, the inspector could try running a hose in the questionable area.
While the best and most foolproof way to remedy the grading is to build up the ground to slope away from the house in all directions, it’s often just not possible. Small lot sizes, the elevation of the house, where the house transitions from foundation to framed wall, the elevation of the neighbor’s land, existing vegetation, hardscape and accessory buildings, and especially cost are all factors in the equation.
Remedies for improper grading include connecting downspouts to a pipe to direct the roof rainwater further away from the house and French drains, which are basically a trench filled with gravel or perforated pipe that catches the water in the yard and directs it away from the house.
For more information about grading, read our previous post, “What’s Your Grading Grade?“
Submitted by Ken Roleke, NPI Franchise Owner, Tucson, Arizona