Pier and beam design was among the most popular foundation techniques until the 1960s when concrete technology improved its floating slab system. Many builders use slab-on-grade construction—especially in warmer regions. We’re going to find out why professionals Jordan Smith of @jordansmithbuilds and Kyle Stumpenhorst of @rrbuildings chose pier and beam over slab-on-grade for the All-in-LP Build in Bellville, Texas. But first, let’s delve into pier and beam foundation.
What is a pier and beam framing concept?
Pier and beam design features deep concrete footings to which piers are attached or, in some cases, piles drilled deep into the ground. Beams are connected to the top of the piers so they are above the ground. The floor joists then sit directly on the beams.
Pros and cons of pier and beam foundation
A number of different factors influence the type of foundation used in home construction—local building codes, frost lines, soil conditions, and whether the area has a tendency to flood.
Pier and beam foundations tend to be more expensive than traditional slab-on-grade foundations. Since slabs are dug just below the frost line, they are an affordable option for houses built in warmer regions and new residential construction. However, big repairs can be a headache as most plumbing pipes are buried in gravel or sand beneath the slab. Repair often means removing hardwood floors or carpet and jackhammering into the concrete to locate and replace pipes.
Pier and beam construction typically sits 20 inches from the ground and allows for a crawl space, which offers easy access to plumbing and HVAC. While slab foundations are often ranked better in areas that flood, pier and beam construction elevates the home for good protection.
Where is pier and beam construction used?
Pier and beam design can be a good option for areas of the country that have more clay soil, which expands and contracts and moves around a lot. A simple slab-on-grade foundation will move with the subsoil and can cause issues with the home, including cracked drywall; sticking doors and windows; and in extreme, but not uncommon cases, a cracked slab. A pier and beam foundation can be less affected by underlying soil conditions, and if the foundation does move over time repair is much less costly than with a concrete slab.
Based on soil conditions and the geotechnical report, Smith and Stumpenhorst felt a simple pier and beam foundation would be inadequate for the All-in-LP Build in Bellville, Texas. They decided to use helical piles to create a deep foundation that will be stable for decades to come.
"The Gulf Coast is renowned for foundational issues, and there are a myriad of foundation repair companies who stay busy repairing slab-on-grade foundations in this area. With this deep foundation, the future homeowners can rest easy knowing they won't have to worry about sticking doors or cracked drywall," explains Smith.
Advantages of helical pile and beam construction
What is the difference between pier, piles and helical piles?
The main advantage of helical pile and beam construction is the known load-bearing capacity of each pile. "If I put enough torque on this helical pile, I get more support. I put 5 900 foot-pounds of torque down and will get 70 000 pounds of capacity out of this design," says Smith of the Bellville project.
While the soil surface appears consistent, a pier in the construction system can unknowingly stand in soft soil or water table. Depths of helical piles are determined individually, which is similar to a soil sample taken at each pier. "One of our piles only went in seven feet before we hit our required torque and depth. We moved over fifteen feet and it took eighteen feet to hit our same load-bearing soil conditions," explains Smith.
How do you frame a pier and beam foundation for best load capacity?
After the helical piles were put down, Smith and his team attached plates to the LP® SolidStart® LVL. LP SolidStart LVL is a strong, straight and durable framing product made for superior performance. It can be used in place of traditional lumber for greater consistency and design flexibility. “This LVL gives us the most load capacity,” says Smith. “As this beam is loaded, the top side is coming into compression and the bottom side is being pulled into tension. The grain going in one direction gives us a stronger beam out of the laminated wood than what actual solid dimensional lumber can be.”
Since there is no need for a concrete flooring system, LP Legacy® Premium Sub-Flooring was installed on top of the I-joists using high performance adhesive to ensure a squeak-free floor for years to come. LP Legacy sub-flooring is an oriented strand board featuring Gorilla Glue Technology®. “It’s super-precise on how long the strands are as well as the orientation of the strand. Because the board is stiffer lengthwise, it’s important how OSB is installed because the strength axis makes a difference on how it’s put together,” explains Smith.
LP Legacy sub-flooring requires a 1/8-inch gap at every interface. “This gap is important,” says Smith. “It allows the board to expand and contract without giving us any type of lippage between the boards or trying to pull the nails out.”
The tongue and groove profile of LP Legacy sub-flooring allows Smith to quickly install the product because the gap is already calibrated to the right thickness.
As a leader in building solutions, LP Structural Solutions is consistently moving in the direction of greater resiliency. Each innovative building solution is viewed through that lens, as well as how it can help achieve LP's overall goal of Building a Better World™. But why this direction? What led LP to focus on resilience in construction? Craig Miles, Director of OSB Sales & Marketing, explores how past trends inform LP's work on modern building techniques today.Continue Reading
Coming off an unprecedented year, the busiest season for selling siding is almost underway! COVID-19 is still a significant consideration as you attempt to move forward with your siding business while taking learnings and challenges from the pandemic into consideration. We talked with Erik Perkins of Perkins Builder Brothers to get insight straight from the jobsite about COVID-19's impact, tips for prepping for a new season, and more. Read on to see how LP can support you with one of the most durable siding options out there as your business ramps up!
Recently, homes are trending toward smaller, more compact sizes. Using extra-tall, cathedral or vaulted ceilings can create the illusion of a larger living space. But how do you avoid installation problems when insulating a cathedral or vaulted ceiling? How do you avoid problems when insulating an open ceiling?
When it comes to installing sub-flooring, one concern rises to the top for many professionals: rain. No matter your geographical area, dealing with some amount of water in sub-floor panels during the installation process is inevitable. That's why it's important to know how to protect the sub-floor during construction and how to prevent water pooling on sub-floor panels.