Low Pitch Roof Framing

Add the length of the overhang beyond this mark and.

Low pitch roof framing.

For a low slope residential roof there are two main options. A 2 4 wall with a 2 6 rafter can be notched for a 4 seat. Measure the outline of. 1 cover the entire surface with a self adhesive flashing membrane such as grace ice water shield there are many equivalent products.

How to frame a single slope roof step 1. When design constraints necessitate a 1 4 in 12 design slope be used the framing members should be cambered or investigated for ponding. At the low end of the valley the subfascias of the two roofs are mitered with a block filling in the roof framing. Use a framing square to help lay out the notch based on the slope of the roof.

Self adhesive flashing membrane under the shingles prevents leakage on low slope roofs. These new flat roof skylights are fitted in a pvc curb and topped with one of two covers. In older buildings the usual method is to install fiberglass batts or cellulose on top of the leaky ceiling with a gap of a few inches or sometimes a few feet between the top of the insulation and the roof sheathing. Position the square at the end of the rafter board with the tongue on your left and facing away from you.

As a general rule roofs that have a high human occupancy rate should be framed with rafters every 16 structures such as sheds or barns can be frames with rafters every 24 again make sure to consult local codes. Mark truss locations on the front and back wall caps of the structure. Standing water is a primary source of roof cover discoloration and deterioration that may result in framing member damage and contribute to premature failure of the structural system on low slope roofs. If your project had a rafter length of 8 or less a safe and strong method is to use 2x8 framed 16 on center.

Just like any other roofing system low slope roof designs will have several effects on the overall construction of the building including the interior volume the style and design of the house the drainage system and the material used for covering. For our 4 x8 lean to example using a 2 4 rafter the depth of the birdsmouth is limited by the 1 3 depth of the rafter rule. There are lots of ways to insulate a low slope roof and most of them are wrong. To transition the eaves the horizontal fascia extends to the last rafter tail and a vertical return finishes the transition.

Then apply standard asphalt shingles over the membrane. Get on a ladder with a tape measure. Erect one truss in. The membrane will outlast the shingles and seal around all nail penetrations.

Measure form the top of this line down the board to determine the line length or length of the rafter less the ridge. Updated on april 8 2016. Use prefabricated mono trusses for the easiest and best framing on a single slope roof. A low slope roof design typically has a pitch of between 2 12 and 4 12.