Flat Roof Framing Methods

Overhangs hips and dormers add greatly to the complexity of the framing.

Flat roof framing methods.

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. Some roofs actually slope in several directions ensuring optimal water runoff.

You can do this with a foam layer that exactly fits your roof. Standard stick framing or the newer truss framing. Adhesives may be useful in bonding the framing of the deck to the sub floor without creating holes. 2011 control of condensation in buildings is the document to view.

Of course flat roofs are not flat but have a very slight roof pitch of between 1 4 to 1 2 per foot. Flat roofs are always built at a slight incline at least 1 8 inch per foot. With platform frame construction shown below walls sit on top of subflooring. Platform and balloon frame construction.

The flat roof is an architectural device that is loved by designers for its ability to create simplistic linear forms. 2x framing wood joists timber framing laminated beams steel concrete or sips. This air is vented at either end of the roof to allow a continuous air flow. When framing a flat roof you will need to create a slight incline.

Which should be considered when investigating fixing methods. Flat roof framing is relatively straightforward. Framing a roof is the last step in framing new construction. Roof framing can be simple or complex depending on the roof.

Nearly all roofs are framed using one of two methods. Platform construction is much more common than balloon framing though balloon framing was employed in many two story houses before 1930. Depending on the span many different materials can frame a flat roof. This will help you create a flat roof framing plan.

In terms of rules on ventilation bs 5250. Stick truss roof framing. Put simply a warm flat roof has insulation of some kind packed into every available void and a cold flat roof allows air to circulate between the joists. While most home builders will outsource the construction of roofing trusses the rafter supports of the roof itself learning to frame a roof yourself is one of the true arts of carpentry and a basic primer is covered below.

Just enough slope to drain water but also flat enough to be a problem if not constructed properly.