How To Tie Roof Rafters Together

Remove siding from the house where the new roof will attach to expose.

How to tie roof rafters together.

Connect a flat roof to a sloped or pitched roof with a ledger board. Rafter ties keep opposing rafters tied together to increase the strength of roof trusses. The truss companies use a gang nail to splice wood together pictured at left. If you are framing a cathedral ceiling there are a couple ways to deal with the need for rafter ties.

It is stamped into the wood at the factory with a hydrolic press. To scribe the roof angle on the ridge a length of stock is leveled over from the common rafters and a 2 by scrap is set against the sleepers. To do this you will use gusset plates on either side of the rafters. Wooden rafter ties cross the span between two opposing rafters mechanically tying the rafters together.

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. After the ridge is cut to the correct angle and length it s nailed into place. Using 16 penny nails secure the gusset plates to either side of the rafter beams. Drive 1 2 inch lag.

T w 2 x h h x run rise where w equals rafter load h equals height of ridge and h equals distance from ridge to center of tie illustration below. A collar tie is a length of lumber that attaches to each opposing rafter near the peak preventing your rafters from spreading apart. How to tie a additions roof to existing roof roof additions to existing roofs how to construct a roof from an exsisting shead how to change a roof line how to attach a deck roof to existing roof how to add a roof over porch attache porch roof on house attach shed roof to house adding a roof to screened in porch adding a roof to existing. Two types of rafter ties wood and metal are common to residential and light commercial construction.

Collar ties also take the stress off of your wall plate and rafter joint. Remove two shingles to each side of the new valleys until you reach the bottom. For additional support you can use ceiling joists which are lengths of lumber that run from the end of one rafter to another. Use pieces of lumber that are the same width as the rafter beams themselves and align them on either side of the rafter beams.

Here s a formula i use to determine tie force.