Lean To Roof Wall Plate Detail

In this lean to roof the upper part of the common rafters is located on a wooden wall plate and also placed with corbel.

Lean to roof wall plate detail.

Downspout strap detail 1 4 dia. 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. Design lean to roof per your local building codes. The joist completes the strong triangle shape with the rafters.

The wall of one side is taken higher than the wall on the other side. Lean to roof is a free standing structure. When attaching ledger board to an existing wall install proper flashing when required. Space rafters either 16 o c.

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. A common problem area is the point where a gutter dies into an adjoining wall as the photo below illustrates. That lip is then set into a reglet or groove in this case cut into the mortar joint of the brick wall above.

A key part of my approach is using a special piece of flashing at this. A lean to roof just means it s attached to an existing structure. Detail for attachment to metal panel siding or fascia. This detail for cmu installation only.

The lower end is done the same way a skillion or shed roof is. The high end of the rafter sits on or attaches to a ledger plate attached to the existing wall. Use right size of rafters and headers. This corbel is made from stone brick or iron.

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. For shingles or 24 o c. 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 exterior of a house presents plenty of opportunity for leaks.

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. 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.