Fixing Uneven Roof Trusses

Roof sag sagging roof rafter repair site built rafter spreader mid span rafter ties smooth wavy roof.

Fixing uneven roof trusses.

Generally a roof truss is composed of triangular shapes for proper support of the roof. Now i can see the wall in roof mode and i know where to make the break in the truss. Repairing this is called scabbing. Determine the size of the roof truss to be repaired.

You can do this by measuring across the width of the truss. Trusses come in different lumber widths 2 by 6 or 2 by 8. Making the tops of your fascia boards the same angle as the roof allows you to easily place roofing material over them without creating bumps or ridges. A roof truss is a frame typically made of wood to carry the weight of the roof s exterior surface.

Well a decent framer can fix it if he ignores the ties sets the trusses square to a wall and then works the ends with the cuts. A 2 by 6 truss will measure 5 5 inches and a 2 by 8 truss will measure 7 5 inches. When damaged or altered this can effect structural integrity of th e roof system. With the inverted hinged truss in place a vertical wedge can be used to bend the sagged rafter upwards.

Obviously this is not a good situation as it can cause the entire roof to fail if not addressed. Localized damage to one or two trusses will typically not result in structural failure of the roof system but could cause the roof or ceiling to sag. At the chimney the homeowner designed an inverted truss to straighten the sagged rafters. Repairing a roof truss often requires replacing or reinforcing wood in its construction.

The bottom image illustrates proper horizontal storage with blocking placed at a suffficient height beneath the stack of trusses to minimize lateral bending and to lessen moisture gain from the ground. When a truss becomes damaged cut or modified there is a chance of a structural overload or that they will not perform properly. Overview from time to time an attic rafter will split along a knot typically after having a new roof installed because of the workers walking around on it. Rip the tops of the fascia boards to match the slope of your roof.

The important aspects of this repair is the length of the split as you will need to adequately cover it. The ho did the walls because that s easy didn t square up the walls and now expects the roof framer to fix it. I drew in a truss on the left going from the roof edge to over the bearing interior wall. These trusses are usually engineered by a structural engineering company to carry a specific roof load.

If a lot of trusses are damaged or one has been significantly modified or cut then consulting a engineer is wise. Roof trusses are engineered components. Then i drew another truss starting at the end of the first truss and going to the edge of the roof on the right.