These are the pairs of beams forming the roof, extending from the outside wall plates to the ridge. If there is a ridge beam, the tips of the rafters will often, but not always, be mortised into the ridge beam. If there is no ridge beam, the rafters will join each other in either a forked, lapped, or butted joint. If they are forked or lapped, they will be trunneled. Rafters are most often tapered over their length and their tails resting on the top plates are often mortised into the plates to prevent slipping.</br>


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