faux stone veneer leaking
  • Location:

    Louisville, KY 40245

  • Inspection Date

    October 14, 2017

  • Age of the home:

    12 years old.

  • Extent of the damage

    80%.  The foyer wall of the home has severely deteriorated from moisture intrusion around the manufactured stone veneer siding.

You can learn more about the technical reasons that manufactured stone veneer siding fails by reading the 3 part series I wrote.  It breaks down the common details I find missing when inspecting faux stone siding, and why folks have the problems they do. In this post, I don’t get too technical, and I use a story format to introduce you to a common but sadly true account of failure.  However, if you have manufactured stone on your home, I encourage you to read all of the info available.

Manufactured Stone Veneer Problems

What is the elevator pitch on why homes with faux stone siding, or manufactured stone, or fake stone, or whatever you want to call it are failing at a scary rate?  It’s pretty simple really. The stone siding is made of molded concrete. Concrete is porous and soaks up water. Wind driven rain gets in between all the little cracks and before long you get lots of water behind your faux stone siding.  The water gets in, but can’t get out.  The trapped moisture then eats away on your home’s walls like a cancer.  Without proper drainage to give the water a place to go, it’s a recipe for disaster.

It’s really that simple.  I inspect homes on a weekly basis with fake stone siding and have never seen an install that was correct. Not one. It’s on starter homes, large mansions, and everything in between.  And if you have this faux stone on your house, it is very likely just a matter of time before you have a failure as well. And it’s not an easy–or cheap–fix.

Failed Manufactured Stone
Leaking Manufactured Stone

Real World Failure of Manufactured Stone Siding.

I was called out to this house after the owners had discovered that their dream that home had turned into a nightmare.  Beth and Sam (names have been changed for obvious reasons) had started to paint their front foyer, and Beth said she could smell something musty. Sam started to poke around the wall at the front door and noticed a bit of damage around the base of that wall. He dug a bit deeper into the situation and started to find moisture damage around the base of the door on the inside around the drywall.

Sam’s first cut into the drywall was only about 2 feet off the floor. “I wasn’t sure where the water was getting in,” he said. “I thought it was rain blowing in around the base of the door. I called a buddy of mine who is sort-of a contractor and had him take a look at the water damage. He told me to caulk around the door and close it back up. I didn’t know exactly what to do, but I knew that wasn’t the right thing to do.”

Thank goodness Sam didn’t listen his friend. You can see from the image below that while the water stains don’t look terrible here, things just below the surface were very wet. Even after a few weeks of being opened up to fresh air and having a fan blow on them, the wet wood around the door and floor was scanning around 90% relative moisture. That is completely saturated, more or less. (Hover over the blinking hot-spots to read the captions on the images.) 

Moisture Damage Around Front Door

The moisture meter was reading anywhere from 20-90% on a relative scale around the front door.  Typically anything above 12% is bad to see with this meter, so 90% gets you in “Oh S$#*!” territory.


Here you can see the dark staining from the leaking manufactured stone around the studs of the front door.

After seeing the damage along the base of the walls on each side of the front door, Sam and Beth decided they had better keep cutting until they found the end of the water damage.  Little did they know how deep that rabbit hole was going to get.

“Once I reached the top of the front door I knew we were in deep trouble. This was way more than just a leaking door.”  Sam said.

Beth chimed in, “The wood around the top of the door was like mulch. With every little bit we pulled out my heart sank a little more. The insulation in the wall was like a wet towel fresh out of the washing machine, dripping with water…  I ended up just getting the shop vac and sucking out my wall. Can you believe that?  I shop vac’d MY WALL out of my 12 year old home.

Rotten Front Door Leaking Manufactured Stone

The front wall above the door was also reading ~90% relative moisture.  The amazing part is this had been opened up and drying for a few weeks before I ever saw it.  Every time it rained they could see water wicking in.


The top of the door had also rotted out.  This is something to look for on your home.  If you notice water dripping from the top casing of your doors or windows,  and you have manufactured stone above it, that is a very bad sign.

More Damage from Failed Manufactured Stone Siding

The water damage near the front door was all the way around.  From top to bottom, it was rotten.  You can see from the pictures below the wood rot was not just at the base of the door. What this tells you is that the problem is coming from above, and the moisture is running down the wall.  This seems to be the trend with leaking manufactured stone siding. The large open walls do OK for the most part.  It is around the doors, windows, and the base of walls that I see the most problems.  Like everything thing in life, the devil is in the details.  And I have yet to see a home with manufactured stone that has those details correct.

The whole wall can’t be rotten, can it? Well…

Beth and Sam kept cutting out drywall.  Trash bag after trash bag, they packed the front wall of their house out to the curb until they reached the bottom of the large window above the front door.

“This is where the wood got really wet, soft, and moldy.  We could tell this was definitely a spot where the water was getting in.”

They were correct.  This is one of the spots that the failure was stemming from.  The “installer” (and I use that term lightly) did not attempt to flash anything around the door or window.  They butted the manufactured stone next to the vinyl frame. It was doomed to fail from day one.  These fine people and their dream home never had a fighting chance.

Leaking Faux Stone

You can see how black the wood is streaming down from the corners of the window.  You could put your finger through it.  When an install of manufactured stone is botched like this, its common to see the bottom corners of windows be the worst spot.


The left side is same as the right.  Extremely rotten from the failed faux stone.

Let’s call the guy who screwed up in the first place

“Once I saw how bad things were, I called my builder and asked him for guidance,” said Sam. “He told me to call the call guy who installed it, as he had never seen anything like this before. So I did. I didn’t let on to what was happening, I simply asked if they were doing anything different with installation methods now versus 12 years ago.” said Sam.

“Nope.  Still doing the same way we always have,” the installer said.  “We’re up to several hundred houses a year now.  Manufactured stone is very popular, and we’re busy as ever!”

“After I hung up with him I couldn’t help but be sad for the thousands of people who very likely have the same problem as I do, but just don’t know it yet.”

“I started doing my own research on what had gone wrong and came across your ACMV Problems Series.”  Sam said (referencing my 3 part series linked at the top of this post).

After reading that, it made perfect sense to me what the problem is.  So I reached out to you for some help, and here we are.  Stuck, not knowing where to go from here.”

Should my home inspector catch this?

All of this brings us to today.  Sam and Beth are in deep doo-doo, with a very expensive problem to deal with.  I asked them if they had gotten a home inspection before they closed on their new home, and they said no. (This is not surprising; lots of people don’t get a home inspection on new construction- they think it’s a waste of money.)  Not that it would have mattered much this time. No one was reporting on botched manufactured stone installs 12 years ago–we just didn’t know it was going to be the monster of a problem that is it now.

In fact, there are lots of home inspectors currently who still don’t know anything about these issues, and don’t report them to their home buyers. I get a couple calls a month from people who find my blog and are wanting answers about why their guy “didn’t say anything about all this.

I don’t know.  You will have to ask your inspector about that.  The boilerplate answer I hear in the home inspection world is that problems like this one are beyond home inspection items, as they’re not visible on the surface (technically a home inspection is a non-invasive look at the house).  You see, a lot of home inspectors hide behind that excuse to keep the heat off of them, and keep their job quick and easy.  Personally, I think that is chicken-$#!@ and doesn’t do anyone any good.  Issues with manufactured stone are widespread, and the sooner everyone involved learns about and deals with the problem at hand, the better off we’ll all be.

As for now, Beth and Sam are exploring options on what happens next.  I hope to stay in the loop and bring you a happier story of restoration and repair when that time comes.  Stay tuned for an update!

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