How Do I Join Two Roof Joists Together

Join rafters at the top or peak either to each other or to a centre ridge board.

How do i join two roof joists together. To do this you will use gusset plates on either side of the rafters. It is stamped into the wood at the factory with a hydrolic press. Depending on how the load is applied it may be necessary to connect the two joists together with a filler block. Use pieces of lumber that are the same width as the rafter beams themselves and align them on either side of the rafter beams.

The term sistering joists is the practice of overlapping two joists by a certain distance across a beam to create an extended joist. Sistering joists is commonly used when adding onto an existing deck or repairing a deck. When a load is applied to one side of a double joist by another joist or header for example then the double joist must be connected together so both joist members are effective in supporting the load. Put the joists end to end get a section of joist to span the gap each side bolts through washers on tighten up and you ve got one long joist braced with two sections where the two sections meet.

A gang nail is basically a thin piece of metal stamped out so that many metal tangs stick out into the wood about a 1 2 or so. This is unusual in new deck construction and would only be necessary for very long spans that exceed the length of your longest boards. The traditional method of joining is framing nails 10d or 12d which are long steel spikes hammered through one piece of wood into another. I would go for something like that.

You can install a flitch beam which is two joists bolted together with piece of steel in between and then support and cut joists then fit hangers on to the new beam giving you flush ceilins answered 9th oct 2011 like 0. The truss companies use a gang nail to splice wood together pictured at left. Slap some pva in the side pice s. Use m8 110mm coach bolts measure down 30mm from the top and bottom of the joists and drill through both the timbers and bolt together space the bolts out 600mm all the way along from one end to the other should be strong enough for a tap dancing elephant.

Sistering or joining joists. Join rafters on the ends to wall caps the top boards on the outside walls which actually bear the weight of the roof.