Framing A Room On A Tar Roof Detail

While some skylight manufacturers include flashing in their products sometimes roofing professionals have to create it or purchase it separately.

Framing a room on a tar roof detail.

Figure 2 2 roof framing terms. At inside vertical corners tom cuts and overlaps the epdm then uses rubber adhesive to glue it down tightly. To transition the eaves the horizontal fascia extends to the last rafter tail and a vertical return finishes the transition. And the line length measurement from the roof peak to the building wall is the hypotenuse.

The run or half the building span is the base of the triangle. The framing of a basic gable roof is based on a right angle triangle and the various roof framing components fit the triangle. However before concentrating on roof framing a brief discussion of diaphragms and shear walls is presented because they are two of the key elements in the framing of load bearing wall systems in most residential and light commercial construction. While tar and gravel roofing or built up roofing systems have many positive aspects if you live in an area or the roof is in a location where it will receive strong sun exposure hot tar roofs will likely damage the roof s membrane if it is left uncovered or unevenly covered by the gravel.

Open valleys have metal flashing to protect this critical area of the roof. You can do this with a foam layer that exactly fits your roof. Determine which framing method you will use to frame the room. The rise or height of the roof at its peak is the altitude of the triangle.

When you should not choose a tar gravel roof. To keep the vertical sections from peeling off the walls tom screws on metal brackets called termination stops then cuts off the excess above the brackets. When framing a flat roof you will need to create a slight incline. The edge of the roof has thin metal flashing that helps water drip off the roof without damaging the home or causing a leak.

Sheathing blocking is added along the valley and the sheathing pieced in for both roof planes. If the unit of rise in inches is 3 then the cut is the unit of rise and the unit of run 12 inches or 3 12. 1 8 pitch is given so 24 x 1 8 equals 3 or unit of rise in inches. It uses more wood than the advanced framing method and has less space between the studs for insulation.

The blocks come in several sizes but this guide will assume you are using a 16 3 4 inch wide concrete slab. Building framing begins with the roof framing structure. The conventional framing method uses 2 by 4 studs on 16 inch 40 64 cm centers. One of the most crucial step in building a flat concrete roof is to figure out the size of the concrete block you will need.

For very small roof jobs you can achieve the same effect by taking 2x4s and converting them into long wedges that you can then nail to the joists. At the low end of the valley the subfascias of the two roofs are mitered with a block filling in the roof framing. The steel joists will provide a strong foundation for the flat concrete.