Carriage Bolt Double Floor Joist

B bolted together with not less than diam. They may be used in the construction of docks swing sets and decks as well as other surfaces where a smooth finish is needed. Twice as strong as low strength steel bolts these bolts are suitable for fastening most machinery and equipment.

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Is m16 too big though for a 50 100 joist.

Carriage bolt double floor joist.

Generally newer home floor joists are made from 2x8s or new engineered i beams older homes however may have 2x6s instead. My main question though is regarding the size of coach bolts to use. While it is a good idea to replace rotted material with 2x8s it may require some notching to fit between the sub floor and ledger board. They are good for wood to wood connections when the head may not be accessible for tightening.

A carriage bolt has a square shoulder under a rounded head which resists turning when the nut is tightened or removed. A nailed together with a double row of nails not less than 3 1 2 in length spaced not more than 18 apart in each row with the end nails located 4 6 from the end of each piece. So we have to go somewhere to find 14 bolts. Carriage bolts may be substituted where through bolts are specified provided carriage bolt washers with square holes are installed at the bolt head.

Anyways we bought the longest carriage bolts we could 12 however they are about an inch short. I have read people recommending m8 10 and 12 and have read that using bolts too big might weaken the joist. So a 2 foot extension will be 4 feet sistered to the existing joist with appropriate fasteners 3 nails in a w pattern every 12 inches or carriage bolts in a tandem pattern every 16 inches depending on the local codes. The section being inserted and sistered should be twice as long as the cantilever.

Carriage bolts have a smooth rounded head for a finished look. Bolts should be tightened six to 12 months after construction due to drying and wood shrinkage. Sorry for the long intro. The square neck keeps these bolts from turning when tightening a nut.

The double brick is very thick and the joist is 3 instead of 2 plus a gap between the bricks and joist. I already have m16 bolts but i worry these might be too big for sistering 50 100mm. Bolts equipped with washers and spaced not more.