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PSC’s

Home Tag PSC’s
FoundationWorks System

FoundationWorks System

Feb 25, 2023

Concrete Slabs and Runners Are Notorious for Failures

Solution?

Gravel Pad With FoundationWorks System vs Concrete Slab or Runners

The FoundationWorks system is designed and engineered for a gravel pad allowing for seismic absorption & lateral friction. Also, this system provides other benefits  like increasing the weight displacement. I will expand more about these awesome advantages below. However, they are why I prefer a gravel pad to a concrete slab.

Load Bearing Path Through 6″ Concrete Slab

Let me explain what a load bearing path means. A load bearing path from the home is on a 45-degree angle through a concrete slab so the effective footing area of a 6″ slab under each pier is approximately 18″ x 18″.  Meaning the entire slab does not provide additional footing or load bearing for the home (see any blocking diagrams in all factory set-up manuals). 

FoundationWorks PSC’s Provide Stronger Load Bearing Path

The load path for the FoundationWorks stanchions or PSC’s is about 12 degrees to grade with approximately 6.3 square feet of effective footing area per stanchion, which substantially increases the total footing area and weight displacement for the home compared to a typical setup on a concrete slab.

Building A Gravel Pad for FoundationWorks PSC’s

Earthquake Resistant Bracing System

FoundationWorks System is considered a E.R.B.S. Earthquake Resistant Bracing System.

  • Start with excavating and removing the organic layer of soil down to load bearing soil. Remember, it is all about pounds per square foot over the bearing soil. Therefore, the more effective footing area over the bearing soil the better (think logger boots vs. high heel shoes).

Think Logger Boots vs. High Heel Shoes

Consider A Typical 27′ x 66′ Manufactured Home

  • Assuming this jurisdiction considers bearing soil to have a value of 1500 pounds per square foot.  Then, the standard blocking (CMU block piers) will be supporting about 180 square feet of footing.
  • Adding the FoundationWorks system to the equation you get an additional 100 square feet of footing capacity from their installation. Thus, your pounds per square foot capacity for the home itself (dead load) on the home pad will be around 270 to 300 PSF. Finally, leaving you plenty of room for added snow load and live load (meaning you and your stuff).
  • At last doing the math. Your home will weigh about 80,000 pounds, so dividing by 280 square feet of footing is about 285 psf. (Total footing area – Blocking and FoundationWorks System).

 

Comparing Gravel Pad w/ FoundationWorks vs Concrete Slab

Concrete Slab

If a concrete slab cracks and settles, there is no adjustment or easy remedy to fix that.  Additionally, because the soil under a slab tends to be moist and significantly cooler than on top of the slab, and a jurisdiction most likely will not allow expansion joints in a foundation mono slab, there is a better than even chance that the slab will crack.  If you choose to do a slab, be sure to excavate to bearing soil and then install and compact structural fill with a crushed gravel cap (5/8″ minus) in not more than 6″ lifts with 95% compaction. Testing is simple.

A hand penetrometer can be used to determine compaction.  If the jurisdiction requires compaction certification, you can use a lab such as Geo-test Inc. to come out and shoot it.  if you end up filling more than 12″, the jurisdiction may want a compaction test by a lab.  The lab will want a “proctor” (test for moisture and density) of your fill material so just have a 5-gallon bucket of it available for them.  Sometimes, a gravel pit will have proctor info on hand for their material.

FoundationWorks Stanchions PSC’s On Compacted Gravel

The FoundationWorks stanchions  or PSC’s are adjustable.  The greatest reason for using this system is that most jurisdictions will require compaction testing. Therefore, building a road under your home makes the most sense.  Especially if you have witnessed like I have slab after slab failing because they lacked compaction under the slab. This costs homeowners thousands of dollars in future repair costs. Many times more that the home itself.

 

Factory Setup Manuals

The factory set up manual and the jurisdiction will require a 6-mil black poly vapor barrier over the slab and that somewhat negates the ability to roll on a creeper under the home.  A home set on a compacted gravel pad also is required to have the same poly vapor barrier over the pad.  Under the home is never a fun place to be but I would say that crawling on visqueen over a concrete slab or crawling on poly over a compacted gravel pad is similar on the fun meter.

Pit-Set (Home Set Down Into Ground)

In some jurisdiction, your home will be pit set with the top of pad about 18″ below the surrounding grade to prevent frost intrusion (heaving).  Concrete slabs have a propensity for wicking moisture from the ground beneath the slab that can accumulate on top of the slab and under the vapor barrier – sometimes causing puddling.  While, gravel pads dissipate or shed water and are tied into outside drainage.

PSC stanchions have enough vertical load capacity to hold the entire home even if the intermittent CMU block piers all cracked and failed during an earthquake.

Superior Earthquake Resistance

Cracked Mobile Home Slab

Slabs commonly crack due to builders placing them on uncompact soils costing thousands $$$ in repairs.

Fact, seismic energy (earthquake) impacts rigid structures following the structural supporting and framing members of the home. I liken it to electricity traveling through a wire.  Thus, strapping a home to a solid concrete slab with tie-downs is extremely rigid.  Therefore, there is very little energy absorption or flexibility.

The FoundationWorks Differences

Best of all, The FoundationWorks stanchions have a positive connection to the frame (bolted clamp) and fastened independently. Especially too with their attached (bolted) reinforced footings allowing some movement and individual energy absorption during an earthquake.  Also, the 16 FoundationWorks stanchions required for this home have enough vertical load capacity to hold the entire home. Surprisingly, even if the intermittent CMU block piers all crack and fail during an earthquake you will be safe.

Where To Buy?

You can purchase the FoundationWorks System from MH SERVICE & SUPPLY, LLC. Either call 360-419-9909 or go to https://mhserviceandsupply.com/earthquake-resistant-bracing-systems-e-r-b-s/

Exterior House Skirting

Exterior House Skirting

Jul 1, 2019

Exterior House Skirting for Pit Set Homes

If you are wanting to pit set your manufactured home  you need an exterior house skirting product like DURASKIRT™. Besides, being an exterior product make certain they can be back-filled. Additionally, this makes the product more valuable especially if you plan to pit set your home.

DURASKIRT™ exterior house engineered skirting

DURASKIRT™ concrete skirting panels for mobile homes is a wonderful product. Great for pit set homes.

So, what is pit setting a mobile home or trailer house?

Pit setting is when you excavate the soils burying the blocking height into the ground. Likewise, this method is preferred so that decks or walkways to enter your home have an easier access. Too, as we grow older less steps or ramps are more desirable.

Therefore, finding an exterior house skirting with the ability to pit set it is vital. This takes some reading of the fine print, so I recommend taking your time. Moreover, when you do find a skirting product for back-filling it’s time for planning.

Planning Pit Setting Your Manufactured Home Using Exterior House Skirting?

Now that you understand what pit setting is, you need to understand the components. Also, the functions of each component of your manufactured homes’ foundation. More still, there are four major components that make for a very secure manufactured home.

Components for Preventing Earthquake or Heavy Wind Damage

  • The Floor Fame: Your manufactured home comes with a flooring system that is secured to a steel structure. This structure is engineered to support the home and occupants and receive
    Earthquake Resistant Bracing System

    Primary Support Collumns or PSC’s: E.R.B.S. Earthquake Resistant Bracing System.

  • Solid Blocking: Cement or concrete blocks are the best support for manufactured homes. They provide great support when following the manufacturers specifications.
  • Tie-downs or Earthquake Bracing: I recommend going with a real engineered E.R.B.S. Earthquake Resistant Bracing System for mobile homes like PSC’s. In the industry we refer to them as Big Foot or Magnums.
  • Individual Concrete Panel Skirting: The best exterior house skirting for resisting damages from earthquakes is a concrete panel skirting system. This allows for maximum movement without damaging the home or skirting. More so, the flexibility of having individual panels and a system like PSC’s is the best.

 

For this reason, I recommend DURASKIRT™ concrete panel skirting. In addition, this system also works for pit setting your home. Finally, it is a great exterior house skirting.

Related Articles:

Stands To Hold Your Home Up

What Is Earthquake Tie-downs for Mobile Homes?

Q. How do you fix a hole in concrete mobile home skirting?

DURASKIRT™ – How Does it Hold Up Under Freezing & Thawing?

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  • Home
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  • Why DURASKIRT™?
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    • “Hidden-Vent”
    • Photos
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