Girders
Definition and meaning of Girders in real estate.
Girders are heavy horizontal structural beams that serve as the primary support for a building's floor joists and load-bearing walls. They span across wide openings and transfer the weight of the structure down to the foundation walls, columns, or piers.
In more detail
In residential construction, girders are typically made of heavy timber, steel, or engineered lumber such as laminated veneer lumber. Because they support a significant portion of a home's weight, any sag, crack, or settling in a girder can lead to sloping floors, cracked drywall, and sticking doors throughout the house.
Structural engineers calculate the required size and span of these beams based on local building codes and the weight they must carry. Home inspectors carefully evaluate girders in crawlspaces and basements for signs of moisture damage, wood-boring insect infestation, or structural deflection. Properly installed and maintained girders are critical to the long-term structural integrity of a building.
Key facts
| Category | Property Types & Construction |
|---|---|
| Common Materials | Steel, solid wood timber, or engineered wood |
| Location | Typically found in basements, crawlspaces, or lower levels |
| Watch out for | Sagging, cracking, wood rot, and termite damage |
During a home inspection of a colonial-style house, the inspector notices a wooden girder in the basement is sagging, prompting the buyer to request that the seller install adjustable steel jacks to level the beam.
Frequently asked questions
What is the difference between a girder and a joist?
A girder is the primary, larger load-bearing beam, while joists are smaller parallel boards that rest on top of or connect to the girder to support the floor deck.
Can a homeowner cut or notch a structural girder?
No, structural girders should never be cut, drilled, or notched without the direct guidance of a licensed structural engineer, as doing so can compromise the safety of the entire home.