## What size do collar ties need to be?

Collar Tie Alternatives By now you know that a collar ties is a wood member with a nominal size no less than 1 inch x 4 inch, spaced no more than 4 feet on center, and located within the upper one-third area of the attic space.

### How are collar ties measured?

Measure the vertical distance from the top of a ceiling joist to the ridge of the roof and divide the result by 3 to determine the height of the collar ties. For example, if the height of the ridge is 96 inches, the ties install 32 inches below the ridge, or 64 inches from the top of the ceiling joists.

What is the minimum size material used for collar ties?

Collar Ties: When rafters are used, collar ties not less than 2×4 (38×89) are permitted to be assumed to provide intermediate support to reduce rafter spans [OBC 9.23. 13.7.]. be used in conjunction with appropriately sized ceiling joists. Ridge beams shall have a minimum bearing of 1 1/2” (89mm) [OBC 9.23.

How many rafters do I need for a 20 foot span?

As per general rules and guideline, for 10 -12 foot span, generally you need 2″×6″ size of rafter, for 15 -16 foot span, you need 2″×8″ rafter, for 18 – 20 foot span, you need 2″×10″ rafter & for 24 foot span, you need 2″×6″ size of rafter placed at 16″ apart from centre.

## How far can a 2×12 rafter span without support?

Max. Live Load 20 lbs/ft2 (956 N/m2)

Maximum Span (ft – in)
Nominal Size (inches) Rafter Spacing, Center to Center, OC (inches) Lumber Grade
2 x 12 12 28′ – 3”
16 24′ – 5”
24 20′

### What size bearing do I need for a beam?

According to the 2012 IRC codes any beam, joist, or header shall never have a bearing of less than 1 1/2″. Anything 5′ and above we always at least double cripple. On longer spans the beam may require much more bearing space as indicated by this table. Beams of more than one ply must be fastened together with either nails or bolts.

What size nail do you use for a beam?

On longer spans the beam may require much more bearing space as indicated by this table. Beams of more than one ply must be fastened together with either nails or bolts. The 2012 IRC code calls for a minimum of a 32″ O.C. staggered pattern with at least a 3″x.120″ nail.

What size should a collar tie be?

By now you know that a collar ties is a wood member with a nominal size no less than 1 inch x 4 inch, spaced no more than 4 feet on center, and located within the upper one-third area of the attic space. What if you did not want to install collar ties in the attic area?

## Will a 4×10 post work as a ridge beam?

In case you’re still wondering, your original question about the 4×10, yes, it will work as a ridge beam, but don’t forget the post connectors…like Simpson’s ACE post caps.