A lean to roof just means it s attached to an existing structure.
Lean to roof wall plate detail.
The lower end is done the same way a skillion or shed roof is.
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.
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.
Design lean to roof per your local building codes.
Detail for attachment to metal panel siding or fascia.
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.
The wall of one side is taken higher than the wall on the other side.
When attaching ledger board to an existing wall install proper flashing when required.
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.
A common problem area is the point where a gutter dies into an adjoining wall as the photo below illustrates.
Notch a birdsmouth where it sits on the low wall and extend it past the wall for the eaves.
X 5 8 bolt brass alum.
Lean to roof is a free standing structure.
Downspout strap detail 1 4 dia.
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.
This corbel is made from stone brick or iron.
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.
Space rafters either 16 o c.
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.
A key part of my approach is using a special piece of flashing at this.
That lip is then set into a reglet or groove in this case cut into the mortar joint of the brick wall above.
For shingles or 24 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.
To install the roof wall flashing above the builder bent the top edge of the flashing into a 90 degree lip about 2 cm in width.
The joist completes the strong triangle shape with the rafters.
