Choose the right truss shape
Every roof shape has its own geometry, load path and cost. Use the table to compare the common ones, then open the matching calculator.
| Type | Best for | Complexity | Calculator |
|---|---|---|---|
| Gable | Houses, garages, porches | Low | Gable calculator |
| Hip | Windy regions, even eaves | High | Hip calculator |
| Gambrel | Barns, lofts, workshops | Medium | Gambrel calculator |
| Mono / lean-to | Additions, sheds, modern homes | Low | Mono calculator |
| King post | Short spans, timber frames | Low | King post calculator |
| Garage / barn | Wide-span outbuildings | Medium | Garage calculator |
| Steel | Commercial, long spans | Medium | Steel calculator |
Other shapes
Scissor trusses have a sloped bottom chord for vaulted ceilings. Attic trusses leave an open room in the middle. Cathedral and butterfly shapes are available in the main calculator’s Roof Type list.
Not sure whether you need trusses at all?
Read truss vs rafter, then check the dimensions and load guide.