Fixing Flat Roof Joists To Wall Plate

Start at one end of the wall so that the first joist is flush with the walls which run parallel to the joists.

Fixing flat roof joists to wall plate.

Set out the ceiling joists onto the wall plates the ceiling joists are installed before the rafters as they will stop the roof spreading and also give something for you to lay planks across to stand on when building the roof. Same size timber as your joists preferably i d look at fitting a 6x2 or whatever size joists are being used timber to the wall using m12 threaded bars around 200mm long drilled through the timber and wall using a 14mm drill bit at 600mm centers. Fixing joists to an existing wall. Mark the installation location for each joist along the wall plate.

To repair a roof joist you will need to either replace the entire joist or use a spliced in piece of wood. Where trussed rafter roofs are not subject to uplift a minimum of two 4 5mm x 100mm galvanized round wire nails skew nailed one on each side of the trussed rafter or truss clips fixed in accordance with the manufacturer s instructions are acceptable. Mark off a joist every 16 inches along the length of the wall with the last joist lining up against the opposite verge wall. Keep in mind that the joist extends through the wall.

We include photographs of collapsing wood framed roofs and photo sequences. Roof sag or roof collapse forces. To fix the joists and rafters down on to the wall plates they should be toe or skew nailed to the top plate like below. Fixing joists to wall plate with face fix joist hanger face fixed and face fixed wrap over hangers can also have the flanges through which the fixing holes are drilled either showing either side of the hanger or concealed where they are bent over to be only visible when there is no joist in the hanger.

Install steel joist hangers at each mark. Where a new flat roof abuts an existing external wall the joists can be hung on metal joist hangers which are fixed to a horizontal timber plate wall bolted to the wall. A cavity closer should be provided to the top of the walls to prevent fire spread and to stop damp air entering the roof space. Clean the hole out thoroughly of all dust and debris either with a pump or hoover.

Step 2 measure roof joist. To replace the joist you need to measure the entire length.