Size of steel needed to support a small mono pitch roof

[Mkol]

Hi Guys, i have a small lean-to outbuilding that currently has a door and a window next to each other, i want to enlarge the opening and use it as a garage. this would mean removing a central block column that is helping to support the rafters.

Im trying to ascertain what size of steel to place across the opening. the load will only be a small mono pitch roof (4m x 4m) approx with clay tiles and the rafters are resting on a wall plate.
short of getting structural engineers on site for what is a pretty small job, can anyone point me in the right direction for calculating the size of steel needed to bridge the gap, the span will be approx 2.6m.

Im thinking i might be ok with something like 152 x 89 x 16.

 

[Bonni]

Structural work requires building regs and building regs will expect a copy of the structural engineers calculation to place on file.

 

[tony1851]

Im thinking i might be ok with something like 152 x 89 x 16.

For that span and loading, a 152 x 89 would be more than adequate.