What Happens If Water Gets Behind Vinyl Siding?

A Worker Installs Panels of Beige Siding on the Facade of a House

Siding Water Damage

Let’s talk about what happens if water gets behind vinyl siding? It will cause siding water damage. If water gets behind your vinyl siding and sits there it will cause rot to the structure. This rot can make window sills and the roof sag due to deterioration of the structure. It will also lead to mold and mildew growing inside and outside the walls of the structure. Even on the outside of the house mold is dangerous. It causes health issues for you and the whole family. It is also expensive to remove.

How does water get behind the siding?

The two main ways that water can get behind the siding are poor installation and no roof gutters or gutters that are not functioning as they should. If the siding was not installed properly when it rains and with heavy winds, it is easy for water to be blown behind the siding.

How thick should vinyl siding be?

The average runs from .035 to .055 inches. The thinner siding is considered builder-grade siding and the thicker is premium siding. The cost varies between the grades of siding. For example; builder-grade will normally run around $100.00 per 10×10 foot square and the premium will be double that. Grades in between those will run somewhere between the price of the two.

How to Protect From Siding Water Damage

The best way to protect from siding water damage is to hire a professional to install your siding. They will also install a moisture barrier behind the siding. This reduces the risk of damage to the structure from water collecting behind the siding. While people may think that siding is waterproof; the truth is, it is not. That is the reason the industry leaders always install moisture barrier wraps to the home before putting siding up. Second, know the signs of water damage from siding leaks. These include:

  • Rotting or warping siding
  • Found that there is a recent spike in your utility bills
  • See mold, mildew, and fungus growing on your siding or foundation walls
  • A single or multiple pieces of loose or missing siding and missing nails
  • You recently found peeling paint or wallpaper inside your home, have you found signs of mold or water damage, but can’t find a leak.
  • The bottom of your siding is deteriorating, flaking, or breaking.

The third way to protect from siding water damage is to make sure your downspouts are not clogged. Clogged drain cleaning allows the water from the gutters to run freely down and away from your home instead of over the edges of the gutters and down the wall of the house.

Protect From Mold Growth

One other way to protect your siding is to protect it from mold growth. Mold can grow on siding especially on the north-facing wall that does not get as much sunlight as the rest of the house. The first step to protect against mold on your siding is to clean the mold if there is any growing already. Here are a couple of easy cleaning solutions for removing mold

  1. Use a mixture of 30% vinegar and 70% water.
  2. Use a quart of bleach for each gallon of water you use.

You can hand wash with a brush or use a power sprayer. If you are using a power sprayer read your owner’s manual before using either solution above in it. Second, make sure that your gutters and downspouts are in good working order and do not have leaks. Third, any duct-work you have outside of your home, for example, a dryer vent, make sure it is not collecting moisture on to your siding. Once a year do an inspection of your siding if you do find mold clean it off.  

Will insurance cover siding water damage?

In certain cases, it may but for the most part, no it will not. If the insurance deems that it was a covered weather event or condition then they will pay but you will have to meet your deductible. However, having said that, it also depends on the type of homeowner’s policy that you have. You should discuss your policy with your insurance agent; ask him or her to explain what is and isn’t covered, and what your options are. If the water damage didn’t happen in a split second but is instead considered “gradual damage,” chances are it won’t be covered by home insurance.

View of Clapboard Siding of Gray House With White Windows & Shrubs


The number one way to protect from siding water damage is to hire a professional and have your siding installed properly with a moisture wrap installed behind it. Be sure to get in touch with a professional roofing company when the siding of your home has developed siding water damage. Only with a professional will you get a professional inspection for proper siding materials and secure fittings.

When you need help with siding water damage in Kansas City, MO call (913) 721-7676 With Herntro Roofing Co. LLC today.