Modifying Garage Roof Trusses

If you really want to modify the framing of your attic and roof then consult with a licensed professional structural engineer.

Modifying garage roof trusses. One use of trusses is for the support of a roof they are similar to roof rafters. My recommendation is really simple. I looked at couple of alternates and determined that we could work from within the garage attic modify the existing trusses so that the top part in the middle of the roof will be piggy backed on the flat part of the bonus room. Don t modify cut wood trusses.

Use a chalk line to draw a line along the floor parallel to the lower edge of the roof from one end of the attic to the other on both sides. If you live in a house with engineered manufactured trusses then don t mess with them. Position the 2 by 4 so that the mark you made is on its inside edge with the width of the board against the upper and lower cords on the outside of the mark toward the eaves. Home owners should avoid cutting or modifying their roof trusses.

The role of the horizontal beam is to tie the truss together and carry the load that would otherwise be sustained by the support and vertical timber also known as the king post. Step 1 measure the width of your roof trusses from inside to inside. These trusses are usually engineered by a structural engineering company to carry a specific roof load. Mark a line on each 2 by 4 at the top of the lower cord and the angled bottom of the upper cord.

You can modify the trusses but it s an enormous amount of work. Attic conversions are now possible by replacing the truss rafters with a shaped trusses or horizontal beams which in return create additional space. Measure in from the lower edge of the roof to a point 1 4 the width of the truss on either side of the attic. When a truss becomes damaged cut or modified there is a chance of a structural overload or that they will not perform properly.