How far apart should deck bracing be?
Ideal deck post spacing is 8 feet or less. The distance between deck support posts depends on the type of wood species used and the size of the joist and beam. There is no minimum span, and maximum spans can reach up to 15′.
Do decks need diagonal bracing?
We recommend installing diagonal knee braces to help support decks that are over 10′ high. Decks with an above grade pier footing type should have bracing installed to prevent the post base from acting as a pivot. Bracing comes in many forms but is always used to prevent racking and increase the frames stiffness.
What is deck sway bracing?
All decks using horizontal decking should have a diagonal sway brace to prevent racking. You may install a metal “T” brace, which is a long metal strip diagonally across the top of the joists, or install a diagonal deck board across the bottom of the deck frame. Decks using diagonal decking do not require sway bracing.
What is lateral bracing?
Stabilizing a wall beam or structural system against lateral forces by means of diagonal or cross bracing either horizontally by roof or floor construction or vertically by pilasters, columns or cross walls.
How do I stabilize my deck swaying?
To stiffen the deck, go underneath and install a row of 2×8 blocks down the center, perpendicular to the joists. Stagger them with enough room to nail or screw them in place through the end grain, then fasten the treated 2x4s to the underside of the joists so they run from corner to corner, forming an X.
What causes a deck to sway?
When people exit your house and walk onto your deck, it creates a parallel movement, causing that noticeable, sideways sway. Over time, environmental factors like strong winds can also cause the deck to push against the walls and sway, furthering the risk of collapse.
Why is lateral bracing important?
Lateral bracing serves to break the top chord into smaller sections, giving it more strength. It does this by keeping the top chord from twisting or bending.
What is the purpose of the lateral bracing system?
Lateral bracing systems are often used to provide lateral stiffness to buildings. These may span one or several bays, single or several stories high (Fig. 1).
What kind of bracing should I put on my Deck?
Burying your posts is another technique that will increase lateral resistance and protect your deck from racking. We recommend installing diagonal knee braces to help support decks that are over 10′ high. Decks with an above grade pier footing type should have bracing installed to prevent the post base from acting as a pivot.
Why are deck ledgers supposed to be braced?
LATERAL BRACING OF DECK TO HOUSE Deck ledgers are engineered to resist “shear” forces, essentially keeping the deck from falling vertically. However, decks are also supposed to be braced to resist lateral forces trying to pull the deck away from the house. Code requirements on lateral bracing are not yet enforced in many areas.
What causes a lateral load on a deck?
Lateral loads can result from earthquakes or from people moving around on your deck. In severe cases, these loads can result in the ledger board being ripped from the house wall and collapsing.
Where to place knee braces on a deck?
For instance 4×4’s can be installed at 45 degree angles parallel to the beam as Y or knee braces connecting the beam to the sides of the structural posts. Always use bolts rather than nails to insure a strong connection. The taller the structural posts the longer and more substantial the braces should be.