Mor-Flexx Caulking for Filling Hairline or Structural Cracks in Stucco Walls, Mor-Flexx With stucco Sand for Best Results.
I have seen some folks buy the tile grout caulking as it also has sand to try and blend in caulking to their stucco walls. However, that sand is called silica, much too delicate to notice any difference when trying to match the majority of stucco textures or finishes.
Mor-Flexx is the best as it first appeared at the professional plastering yards, where we professionals shop, as we are held to a higher standard for longevity and quality.
These days, I have seen this Mor-Flexx at all the big chain stores such as Home Depot and Lowes and many quality hardware stores. Why? It’s the real deal.
It’s able to flex when the stucco walls move. Newsflash folks, all homes flex.
Perhaps this is where they got the cool and clever name?
Should you caulk cracks on stucco walls? Absolutely, and as soon as you notice them.
Should you caulk the cracks on the inner corners of your chimney where it meets the wall?
Yes. It’s one of the most important areas you want to keep the rain out of.
Why? That is an excellent question. Glad you asked.
The rain will now flood these cracks. In colder climates this cases spalling, spalling means the rain freezes, expands and cracks the stucco much faster. Allowing water to calculate and do its damage.
It’s like putting a beer in the freezer except at a more expensive loss.
Even without freezing temperatures, the same situation occurs with time.
he wood then rots, the bugs come for an easy meal, the rest is elementary in wood rot and termite damage.
Caulking or fixing large stucco structural cracking on stucco walls where hairline cracks appeared; should be caulked when they occur.
Should you be alarmed? No. Concerned? Naturally, the longer you do nothing, the more degraded the membrane and wood could get from the rainwater.
As a rule, the rainwater will absorb into these cracks soaking the substrate or wood frame, expanding the wood.
This creates more significant gaps each season, catching more rainwater.
This rainwater starts the decay process. The wood rots attract termites that are always looking for a free meal, then possibly after ten years, you have a fortune worth of wood rotted damage that you have to remove the stucco to repair then reinstall the stucco. Don’t let that happen.
Simply because you didn’t realize that cracking in stucco walls in critical areas such as chimneys does some big-time damage. So spend the 7 to 10 bucks for a tube of quality caulking and keep inevitable cracks filled.
FYI we have hundreds of always free videos that will explain whatever you are pondering to learn.
I have 40 years in the stucco trade, and, with the help of my sons and daughters, we have been making these stucco-leaning videos for over ten years.
This means you can depend on us for sound advice with all your exterior stucco and interior plastering needs.
Caulk your stucco cracks when they occur, especially where chimneys meet the home.
Cracks in stucco ignored can tear the membrane protecting the wood siding.
I used Mor-Flexx as it has stucco sand, is really easy to use, and is water-soluble.
Note: most caulking are engineered to fill gaps at 3/8 deep and or width; what happens if you add more or the cracks are so large it sucks in a lot of the caulking inward?
Nothing, so don’t panic. Merely add more when it’s dried.
Our tip to our faithful subscribers, https://www.sashco.com/products/mor-flexx/
I also explain how to fill huge gaps in stucco walls with a couple of cans of “expanding foam” this foam, when used properly, will seek out all hollow areas and fill them, preventing future rainwater intrusion.
Then when this foam is set, shave off the excess expanded foam and match the stucco finish with any caulking that has stucco sand in it.
The Sika-Flek 1A caulkings I’ve used in the past videos for lathing are the absolute best for lath as it’s a construction adhesive sealant.
However not suitable for crack repairs that are on any textured stucco wall.
Big Tip: Wear gloves as “expanding foam and polyurethane caulking’s” are a nightmare to get off your skin, plus no doubt not good for getting on your skin in the first place.
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