How To Build A Dormer On A Shed Roof

Recessed dormer set into the roof a recessed dormer i like to call it a sugar scoop maximizes the height of the dormer face while minimizing the projection of the dormer roof above the main roof plane.

How to build a dormer on a shed roof.

Make a simple rafter jig if the slope of your dormer roof is the same as your old roof hold a scrap of plywood against the old roof boards and draw a level line on it. Flush dormers tend to look boxy and flatter roof pitches make them appear even boxier. Using this outline as a guide use a drill to create a pilot hole at each of the 4 corners that you have marked being certain to drill straight down through the ceiling. Making shed dormers work a shed dormer can be the best way to add space to a one and a half story house but you have to get the details right if you want the dormer to be an asset.

Remove the shingles and the sheathing board from the area of the roof where the dormer will constructed. After determining the size of shed dormers you would like remove the shingles and use a measuring tape to draw the layout of the dormer on the roof with chalk. Roll the tarp up so you will be prepared in the event of rain. Use measuring tape to determine the exact size.

After creating a fine layout create holes with the help of drill and make four corners. The dormer s roof slope should be at least 4 in 12. In the center of the dormer we installed a double rafter with a wall below sheathed on both sides with 1 2 inch plywood. The center wall and cheek walls act as buttress walls to resist thrust from the front roof and to eliminate the need for a structural ridge.

Frame a classic shed dormer if you start with a full scale layout on the subfloor and plan the finished details the framing should go smoothly. Build a shed dormer step 1 remove the ceiling drywall and insulation from an area 1 foot higher and 2 feet wider than the area where the dormer will go. Mark the inside edges of the dormer s sidewalls in chalk. Along the level line and using a square to draw a perpendicular line up to the roof edge of the board.

Affix the tarp to the roof screwing a 2 by 4 5 08 by 10 16 cm over it. Cut through the drywall with a utility knife and pull it away from the rafters. Make a rafter cutting jig by measuring 12 in.