Roof Truss Strength

Finally the truss calculator will compute the best dimensional method to connect the pieces of the truss with steel joints and a bridge.

Roof truss strength.

I d go to your local truss manufacturer and give him all the info i listed above and have him run it through his truss calculator. A miter saw or motorized chop saw will come in real handy here. Truss spans can reach 60 feet. Roof trusses support a roof s weight by transferring the weight load downward and outward to the building s bearing walls.

Such trusses are not hard to make. A roof truss simply put is a wooden frame that supports the roof of a built structure like a shed. The same thing is true for the bridge of the truss. The webbing effect of the truss members creates outstanding structural strength even though smaller lumber is used.

Trusses are made up of four main parts. The only difficult part is cutting precise angles on the ends of the members so they will fit together tightly. The straight lengths of wood known as members that roof trusses built with are connected with intersections that distribute the weight evenly down the length of each member. The more complex the truss framework is the greater quantity of these joints will be required.

Roof truss span tables alpine engineered products 15 top chord 2x4 2x6 2x6 2x4 2x6 2x6 2x4 2x6 2x6 2x4 2x6 2x6 bottom chord 2x4 2x4 2x6 2x4 2x4 2x6 2x4 2x4 2x6 2x4 2x4 2x6 2 12 24 24 33 27 27 37 31 31 43 33 33 46 2 5 12 29 29 39 33 33 45 37 38 52 39 40 55 3 12 34 34 46 37 39 53 40 44 60 43 46 64 3 5 12 39 39 53 41 44 61 44 50 65 47 52 70. It ll take him about 5 seconds and you ll know for sure. These steel joints are needed to support the overall truss. A roof truss is a triangular wood structure that is engineered to hold up much of the weight of the rest of the roof.

According to the american wood council the maximum span for rafters is about 30 feet and that s with a relatively low load of 20lbs per square foot. The bottom horizontal of the triangular truss form which corresponds to the joists in stick framed roofs is known as the lower cord. Trusses are designed based on 1 top and bottom chord size 2 size of web members 3 size of connectors at each chord 4 species of wood 5 pitch of roof. Excellent strength and span.

Long ago engineers learned they could add greatly to the strength of a roof by inserting compression members within the frames. They do this by means of top chords which are sloping members that extend from the peak of the roof to the top of the exterior walls at the eaves. These pieces are known as upper cords and there are two of them in each truss. Since they transmit weight from the roof to the exterior walls none of the interior walls needs to be load bearing.