Written by Turnkey Siding
Key Takeaways
- Installing new siding over old is legal and common, but it hides the one thing that matters most in South Louisiana: whether water is already getting into the wall.
- Layering works best over flat, dry, well-fastened original siding on a house with no moisture history and no rot at windows or the base of walls.
- It’s a poor fit when the existing wall is uneven, holds any rot, has failed flashing, or when you’re switching to a heavier material.
- Skipping tear-off typically saves 15 to 25 percent of the job, and can cost far more later if it seals a moisture problem inside.
- Turnkey Siding inspects the wall before recommending either route. Free estimates at 504-882-9704.
Can You Put New Siding Over Old Siding?
Quick Answer: Usually yes, physically. Most siding materials can be furred out and hung over an existing wall, and building codes across the New Orleans metro allow it in many situations. The real question isn’t whether it’s possible. It’s whether covering the old wall is a good idea on a house that sits in Gulf Coast humidity, and for a lot of homes here the honest answer is no.
We get this question most from owners of 1970s and 1980s homes in Metairie, Kenner, and Harahan, where the original siding is still holding on and the quote for tear-off feels steep. The savings are real. So is the risk.
When Layering Actually Makes Sense
There’s a narrow set of conditions where going over the top is defensible:
- The existing wall is flat and true. New siding telegraphs every bump underneath it.
- No moisture history. No past leaks, no staining inside, no soft spots outside.
- Windows and doors are already properly flashed and you’re not disturbing them.
- The original siding is well fastened, not loose or cupping.
- You’re adding a lightweight material, not brick or stucco.
If all five are true, layering is a reasonable way to save money. Miss any one of them and you’re building on a problem.
Why Our Climate Argues for Tear-Off
South Louisiana punishes trapped water. Heavy, wind-driven rain pushes moisture into seams, and humidity keeps anything that gets in from drying out. A wall assembly here needs to shed water and then dry. Adding a layer on top gives water more places to sit and fewer ways to leave.
The bigger issue is what you give up. Tear-off is the only time anyone sees the sheathing. That inspection is how we catch the rot that shows up around window corners and along bottom courses on older metro homes, and it’s why the signs of water damage behind siding so often turn out to be worse than they looked from the yard. Cover the wall without looking, and you’ve made a permanent bet that nothing is wrong back there.
The Termite Problem
There’s a second reason particular to this area. Formosan termites are well established across the New Orleans region, and a layered wall gives them more concealed pathway and makes inspection harder. If your house has any history of termite activity, tear-off is the safer call, and the open wall is the best access anyone will get to your framing.
What Layering Costs You Besides Money
Beyond the moisture gamble, a few practical tradeoffs:
- Window depth. Adding thickness sets windows deeper into the wall. On some homes that reads as a design feature. On others it looks wrong.
- Trim and fixtures. Outlets, hose bibs, vents, and light blocks all need extensions.
- Weight. Heavier finishes over an unverified wall are a structural question, not a cosmetic one.
- Warranty. Some manufacturers restrict coverage on layered installs. Read the terms before you commit, and ask the installer to put their own workmanship terms in writing.
What We Recommend
On most homes we inspect across New Orleans and the surrounding parishes, tear-off wins. Not because it bills more, but because the wall behind 30-year-old siding in this climate is rarely as clean as the outside suggests, and a proper siding installation includes repairing what we find and installing a real drainage plane.
Where a house genuinely checks every box, we’ll say so and price it both ways. You should see the number for each route before deciding. If you’re weighing whether the whole project is worth it yet, our post on when to replace siding is a good starting point.
Frequently Asked Questions
Does code in Orleans or Jefferson Parish allow siding over siding?
In many situations, yes, with limits on the number of layers and on the condition of the substrate. Requirements vary by jurisdiction and by what you’re installing, so confirm before you plan around it. Our siding permit guide covers how the process runs locally.
How much does tear-off add to the job?
Removal and disposal generally accounts for 15 to 25 percent of a siding project, before any sheathing repair that turns up. Repair is billed separately because nobody can price a closed wall honestly.
Can you go over stucco?
It’s more involved than going over lap siding and depends on the stucco’s condition and how it’s attached. We look at each case individually. See our comparison of stucco vs siding in New Orleans for background.
Will layering hurt resale?
A well-done layered install rarely shows up as a problem on its own. An inspector finding moisture or termite damage in a wall that was covered instead of repaired is a different conversation.
Get an Honest Read on Your Wall
We’ll inspect the existing siding, check the areas where water and insects usually get in, and tell you plainly whether your house is a candidate for layering. If it is, you get both prices. If it isn’t, you’ll know why.
Turnkey Siding serves the full metro, from River Ridge to Chalmette. See all siding services or call 504-882-9704 for a free estimate.