The joist completes the strong triangle shape with the rafters.
Lean to roof wall plate detail.
Lean to roof is a free standing structure.
Downspout strap detail 1 4 dia.
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.
For shingles or 24 o c.
Roof wall junctions can be classed as simple such as a standard horizontal apron flashing see a in figure 82 or complex such as where the previous apron flashing terminated within the.
When attaching ledger board to an existing wall install proper flashing when required.
The lower end is done the same way a skillion or shed roof is.
Detail for attachment to metal panel siding or fascia.
Unless you re careful step flashing can allow water from the roof to slip behind the gutter and get behind the siding and even the housewrap.
A key part of my approach is using a special piece of flashing at this.
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.
Use right size of rafters and headers.
The wall of one side is taken higher than the wall on the other side.
Space rafters either 16 o c.
In this lean to roof the upper part of the common rafters is located on a wooden wall plate and also placed with corbel.
A common problem area is the point where a gutter dies into an adjoining wall as the photo below illustrates.
This corbel is made from stone brick or iron.
A lean to roof just means it s attached to an existing structure.
Design lean to roof per your local building codes.
That lip is then set into a reglet or groove in this case cut into the mortar joint of the brick wall above.
The exterior of a house presents plenty of opportunity for leaks.
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.
The ceiling joists span from wall plate to wall plate and are sometimes bolted to the rafters to help stop the ridge dropping and the roof rafters spreading.
This detail for cmu installation only.
Good detailing of the roof wall junction for lean tos is important for the weathertightness of a building but this junction can present some challenges.
The high end of the rafter sits on or attaches to a ledger plate attached to the existing wall.
