Where Does Siding Meet The Foundation? (Explained!)

Sidings and foundations are essential parts of the house structure; they meet at some point, usually at the base. The meeting point of these two parts is often questioned if it should blend or if a part needs to be over the other.

The siding often overlaps the foundation and creates space between them. This gap is important to maintain the normal flow of water and prevent water from getting stuck behind the sidings.

In this article, we will look at where foundation and siding meet if the gap between them is necessary, if the gap needs to be sealed, and how to seal the gap between siding and foundation.

Here’s Where The Foundation And Siding Meet:

The foundation and the siding meet at the base of the building, where the siding overlaps the foundation slightly to ensure the smooth flow of water. The siding should be above the foundation by 6-8 inches and overlap the foundation with at least 2 inches. The gap should be left open to let water out.

Do Foundation And Siding Meet?

The foundation of your house forms the base of the building. It gives direct support to the entire weight of the building. More often than not, the foundation remains beneath the ground, but in some cases, you might see a part of it above the ground.

The sidings work to protect the building’s interior from the effect of rain and harsh weather. It usually runs from up to down and sometimes meets with the foundation if it shows above the ground.

Foundation and sidings should not meet at a point; the sidings ought to overlap at a junction instead of meeting. Ideally, the siding should be 6-8 inches above the ground while it overlaps the foundation by about 2 inches. This ensures the proper water runoff and keeps moisture from seeping beneath the siding material.

Sidings should overlap the foundation of the building to protect the sheathing beneath it, the framings, and other sensitive structures of the house. It gives an appealing look when the siding overlaps the foundation: the house’s color and design rhyme with no space for the foundation to peek out.

Is There A Gap Between Siding And Foundation?

Sidings tend to meet the foundation of the building at the base of the house. In many cases, little space is left between them. Then, the question pops up: Is it ideal to have a gap between siding and foundation, or should they blend?

There should be a gap between the siding and the foundation that allows water to run off rather than soaking the concrete material of the foundation. The meeting point of foundation and siding should have the siding slightly overlapping the foundation.

Take a look at this scenario, when rain falls and hit the siding, the normal route of the water is to drip off the siding and run into the gutter, but when the siding blend with the foundation, the whole volume of the water wets the foundation before getting into the gutter. The foundation was not made to resist water, so it might take a while for it to get dried, it might soak up the material, it could leave a patch behind on the material, and in extreme cases, it might allow moisture to seep into the interior part of the building.

Should water get trapped behind the siding, the gap left behind it is meant to allow it to let the water out and get dried.

However, a common problem is a gap between the siding and the foundation; little animals and debris can find their way into the building through the gap. When that happens, you block the gap with a porous material that can still allow water to pass through it but block the path of anything solid.

Do You Need To Seal The Gap?

The gap between your siding and the foundation is good for letting out water, but it also allows some unwarranted materials or animals in. Therefore you might be curious if you need to seal up the gap.

You might consider selling the gap if you’re constantly disturbed by the presence of any creature, especially mice or dirt behind your siding. To do this, make sure you use materials permissible for water to pass through but block the path for any other material.

You do not want to completely seal up this gap because doing so will cause more harm than good. If you use impenetrable material to seal it, you are indirectly creating a water balloon between your siding and the other parts of the building. The space was intentionally left to allow water to dry out and prevent rot and molds from growing behind the siding.

The best you can do is seal up with a mesh wire, foam, or metal step flashing. It would solve your problem and still maintain the purpose of the gap.

How To Seal The Gap Between Siding And Foundation?

When mice begin to disturb your house, and you discover that they enter through the gap between your siding and the foundation, it becomes necessary to block that gap. Those animals are small, but they can prove destructive and are also carriers of pathogens.

Sealing between siding and foundation is considered an easy process. It just entails your time and the necessary tools you will need to get the process done. To seal the gap, you need the following materials: a torch, hand gloves, an expanding foam, metal flashing, rags, and eye protection.

The following are the processes you can follow to seal up the gap.

  1. The first thing to do is to inspect the gap. You use your Torchlight to locate any other cracks or holes behind the siding.
  2. Put on your hand gloves and eye protection as preventive measures in case anything happens.
  3. Measure the gap between the siding and the foundation
  4. Cut the expanding foam according to the measurement of the gap. Ensure that it fits the space well.
  5. Place some metal flashing at the bottom of the siding
  6. Place the expanding foam and screw both into the concrete.
  7. Clean any cobwebs or dust that might have stained your cloth.

With all these steps, you can easily fix a cover material on the gap.


Gaps tend to exist between home sidings and foundations above the ground. This gap is necessary to allow any trapped moisture out and keep the interior part of the building dry.

Although this gap can become an entry point for mice and rats, you can only cover it with porous material so that you do not create a water balloon behind your siding when you block the gap.