Shed Dormers, Explained
Design/Build: Here are some guidelines for getting your shed dormers right.
Shed dormers are often horizontally proportioned and cover large portions of a roof to open up an attic for more usable space. Like other dormer types, they can either be an extension of the wall below or an object set in the roof. Of the two types of shed dormers, wall dormers break the eave and are typically more vertical in nature, even when they have ganged windows, while roof dormers come in all shapes and sizes. Roof dormers are often stretched across the width of the house, holding several ganged windows, but can also be small enough to hold an individual window, similar in scale to a gable dormer, but with a shed roof. Here are some guidelines for getting your shed dormers right.
A shed dormer can be an extension of the wall below or it can be bumped up from the roof plane. The most important consideration when deciding between a wall and roof dormer is the head height of the window in relation to the eave height of the house. For example, you may want a roof dormer, but to see out the window, you’ll need to bring the dormer forward to the edge of the building, where it could look oddly placed. In this case, a wall dormer may be a better option.
The first consideration when designing your dormers is the height of the windowsill and the use of the room inside the dormer. If the dormer holds an egress window for a bedroom, the height of the windowsill will be set by local building codes. While this varies, you typically do not want to set the sill higher than 30 in. above the floor. Once you have the height of the window set, you can see the implications on the elevation. You…