High To Low Roof Party Wall Detail

An area separation wall can be used in townhouses up to four stories 44 tall and with all common floor ceiling heightsa.
High to low roof party wall detail. With double wall construction the separation begins at the floor joists and runs all the way to a roof parapet. Another approach is to build a cupola or ventilated doghouse in the middle of the low slope roof an approach championed by joe lstiburek. It must either be continuous from the foundation to the underside of the protected roof sheathing or continue through the roof to form a parapet. Two totally separate walls are built side by side with a few inches of airspace.
Using roxul safe 45 with our rockwool batt insulation creates a high density party wall system that improves sound dampening and fire performance. If the upper edge of a low slope shed roof intersects a vertical wall the most logical approach in my opinion is to detail the roof as an unvented roof. The area separation wall is designed to allow for collapse of the. Do not use the area separation wall system where exposure to constant dampness and or water may occur.
It also reduces the time labor and material costs usually associated with adding a double layer of gypsum over the wall studs.