2019. 5. 23. · Rule of thumb is that carriage bolts are for joinery, lag bolts are for extra strength. Carriage bolts require nuts. Lag bolts are like screws, on steroids. In your situation, use carriage bolts and washers. i'm familiar and have used both in the past, i just dont really want to use lag screws if i can avoid it.

Lag bolts help with sheer strength, which is normally what why you need them on decks. You're also better off with nails instead of screws for 

Special "Treehouse Screws" (also known as: 'Garnier Limb', 'Treehouse Attachment Bolt TAB' or 'Tree Fastener') are used to keep wooden beams at a distance so that the tree can continue to grow undisturbed. Normal wood screws from the DIY store are not suitable for fastening a treehouse, as they are not designed for the high load.

C DECK BEAM PER DETAIL 1/S09 D DECK POST PER DETAIL 2/S09 F DECK LEDGER FASTENING PER DETAILS NOTCH IN POST FOR BEAM (2) 1/2" DIAMETER THROUGH-BOLTS WITH WASHERS 6X6 MINIMUM POST SIZE. DECKING TYPE AND NOMINAL SIZE The tip of the lag screw shall fully extend beyond the inside face of the band joist.

In a ledger board application, a ½” x 4” lag bolt was tested to provide 180 lbs support of allowable shear load per screw. Be sure to know what you are connecting to. Standard bolt patterns are

The average price for Lag Bolts ranges from $10 to $200. What are the shipping options for Lag Bolts? All Lag Bolts can be shipped to you at home. What is the best-rated product in Lag Bolts? The best-rated product in Lag Bolts is the 1/4 in. x 3 in. Zinc Coated Powerlag Hex Drive Washer Head Lag Screw (500 per Pail).

Lag screws or bolts shall be staggered from the top to the bottom along the horizontal run of the deck ledger in accordance with Figure R507. · Maximum 5 inches.

Deck Support Beams How to Size a Deck Beam A beam is a solid structural member that is supported by posts and footings that accepts and transfers the load from joists. Once you know the distance between support posts and the length of the joists that will be supported you can determine the required size by checking our beam-sizing chart.

The most common method is to install ½” lag bolts with washers or carriage bolts with washers. You will usually need the length of the bolt to be at least 4”- 6 

Special Ledger Screws Because of the tedious process involved in drilling several pilot holes in the wood to use lag screws, there are a few 

Check to be sure the lags or bolts are fastened into solid house framing, not just plywood sheathing. If your ledger is attached with just nails or decking screws, install half-inch-diameter lag screws or carriage bolts, spaced 16 to 24 inches apart. If the ledger is badly split or cracked, replace it. 2. Cracked Concrete Piers