One collar tie would be enough in your case.
Shed roof ridge beam.
In order to adhere to standardized building codes and ensure adequate runoff your shed s roof must have a pitch of at least 3 12 read as three in twelve.
The difference between them is that a ridge beam is a structural member that bears half of the live and dead loads of the rafters on either side of it but a ridge board is not structural.
The term pitch refers to the slope of the roof.
Building trusses on site is easily done for a shed.
Here s a picture of a gable style shed using a ridge beam.
Framing in a ridge beam in shed roof construction is not hard.
Determine your desired roof pitch.
For example if the slope is 4 in 12 and the run is 12 feet the ridge beam height m will be 4 feet.
Determining the ridge beam height.
You don t need a ridge beam but you do need a way to keep the walls from spreading.
However our instructions include making shed rafters with a ridge beam.
I always always build trusses.
A ridge beam runs the length of the shed roof connecting every pair of rafters.
Versa lam lvl size chart laminated beam span tables charts.
The rafters are angle cut at the ridge end and notched with a birdsmouth where it meets the top plate of the supporting wall.
Lawriter oac 4101 8 01 roof ceiling construction.
This can be accomplished with collar ties boards spanning the shed at ceiling height or with large gussets further up the rafter slope.
Shedme shed roof rafter span.
Structural ridge beam tricks of the trade span for residential framing glulam ridge beam span table elcho beams tables golagoon nz glulam beam span tables designing with roof rafter span tables.
A simple gable shed roof is often built using 2 4 or 2 6 lumber for the rafters and 2 4 for the collar ties.
Some shed rafters do not incorporate ridge beams either due to small size or lack of technical know how.
A proper beam would have a supporting post at each end.