The ridge beams has to be upgraded to physically carry the load of the roof or collar ties have to be installed. But, if you want to vault the ceiling, you have two options. If you have ceiling joists, they’re a very efficient method of resisting this force. This thrust has to be resisted or your walls could collapse. This means, as weight builds up on the roof, the roof pushes the walls outwards. Because they are slopped, they actually end up putting a thrust onto the walls. How does a roof work? Generally, it takes the downwards loads on the roof and pushes it to the walls below. Most of the time, if the ceiling joists run the same direction as the rafters, you wouldn’t need to install both collar ties and ceiling joists for reasons we’ll discuss below. Then the ceiling joists are the yellow pieces while the collar ties are rendered in green. This are the pieces that support the roof sheathing and shingles directly. The purple pieces are rafters that run from the ridge beam to the walls. Working from the top down, the orange beam is known as the ridge beam. Parts of a Roofīefore we get into details, we thought we’d define some terms when it comes to roof structure. However, there is one concept that is deceptively simple and also very easy to get wrong. We don’t usually recommend people worry too hard about the structure of their roof. There can structural pieces running side to side, up and down, or on some weird diagonal. One of the hardest things to design on a house is the roof.
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