Guide to Insulated Precast Foundation: Precast Foundation Walls vs. Poured Walls
Get to know the difference of an insulated precast foundation and a poured basement before starting the construction process with your modular home contractor.
Construction Time Insulated Precast Foundation Walls vs. Poured Basement Walls
Installation of the insulated precast foundation walls and poured basement walls can be completed quickly – often in just a day or two and are not as susceptible to weather delays. Precast foundation walls are poured in a factory setting, assuring the quality of cement mix (no extra water is added on site, which can weaken the concrete).
psi of Insulated Precast Foundation Walls vs. Poured Basement Walls
Insulated precast foundation walls are typically poured at a higher psi – around 5000. Poured basement walls are a lower 3500 psi. However, the poured wall is solid throughout rather than 24” on center, so it doesn’t need the stiffer mix necessarily.
Drainage System for Insulated Precast Foundation Walls vs. Poured Basement Walls
Pea gravel footing of precast option allows for superior drainage. Rising water under the basement slab can flow to the footing tile through the crushed rock footing. On a poured wall system, water has to get around the concrete footing to reach the tile, which builds pressure, or flow into a secondary tile inside the footing to get out.
Certain soil types that are weaker (sandy, silt) are not ideal for insulated precast foundations.
Use of a insulated precast foundation system requires a little more coordination on the part of the general contractor, including scheduling rock delivery, flatwork, excavation and tile work. Precast foundation option reduces the chance for stress cracks in the wall system with controlled joints in the panels, but relies heavily on sealant to keep water out.
Warranty of Insulated Precast Foundation Walls vs. Poured Basement Walls
Precast options may come with a warranty. Superior Walls carries a 15 year limited warranty. Poured walls usually do not have a guarantee. Precast walls are pre insulated and ready for drywall. The concrete studs have holes to accommodate plumbing and electrical.
Cost of Insulated Precast Foundation Walls vs. Poured Basement Walls
Precast systems are relatively new in the residential field and homeowners, building officials, flatwork contractors, and builders alike are skeptical of them. Builders may charge more to build on a precast system because of the learning curve. There are a few minor extra steps that must be taken (mainly additional bracing and a delay in backfill) with the precast system that will increase the labor costs from the builder. Do your homework and choose a builder that has experience with the precast system installation, or you may pay for it.
In case you still have question about modular homes, you may contact Legendary Homes Inc in Jackson, Michigan. A representative will be happy to assist you. Meanwhile you can check our modular home price sheets by signing up to our blog
