Fixings used to connect the roof structure to the wall plate should be specified according to the roof construction and exposure of the site.
Wall plate in roof construction.
A second layer of dimensional lumber is always fastened to the top plates of the erected.
Rafters are beams that run from the peak of the roof to the top plate of the supporting walls.
Framing in construction is the fitting together of pieces to give a structure support and shape.
There are two basic methods of pitched roof construction.
Pitched roof construction.
2 a horizontal member such as a steel plate fixed to a masonry or concrete wall to carry the end of a beam or to attach a beam to other members.
They join at the peak of the roof by connecting to the opposing rafter or to a ridge beam that runs the length of the peak of the house or shed.
These are typically 1 2 m long with a cranked end and are fixed to the wall plate at 2 m centres.
As the mortar does not bond the wall plate to the wall steel straps are used to ensure that the roof structure remains secure.
When fixing the wall plates down onto the brickwork if the building is square rectangle measure from corner to corner diagonally.
One of the first stages of construction is fixing the wall plate.
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.
Wall plate 1 a horizontal member usually timber bolted or otherwise fixed to the top of a wall to which the roof framing is fixed.
The rafter is cut so it sits down onto the wall plate which is in turn fixed down onto the inside skin of a cavity wall.
Rafters are installed piece by piece during the construction of the roof.
The diagram above shows the components that go into making up a small gable roof.
When the measurement is equal the plates are square.
Its purpose is to allow easy fixing of all further timber at the wall.
Building a pitched roof traditional joinery method with gable walls.
Upper wall plate top plate or ceiling plate upper wall plate which is fastened along the top of the wall studs before the wall is lifted into position and on which the platform of the next story or the ceiling and roof assembly rest and are attached.
The ridge is a long board at the top that the rafters are nailed to.
A cut roof this is the traditional method of cutting the timber on site and building up the roof using rafters ridge boards joists and purlins etc the exact details being determined by the size of roof size of timbers etc.
This is simply a timber beam that is fixed to the top of all the walls typically by nailing through it directly into the brickwork below.
Another way when the roof is too large for that or there are not four corners is to use the 3 4 5 method shown here to make sure the corners are at a perfect 90.
Framing materials are usually wood engineered wood or structural steel the alternative to framed construction is generally called mass wall construction where horizontal layers of stacked materials such as log building masonry rammed earth adobe etc.
