House Plans Matching Fascias Using Roof Trusses
There are several factors to keep in mind when matching overhangs (fascias) on the job. In order to obtain an even fascia band when more than one roof pitch is used on your home, there are tricks involved. Roof trusses and conventional framing follow different rules, so in the following calculations, we will use roof trusses for the example.
Further, we will assume all match up situations incorporate a 2×4 top and bottom chord and that the overhang extensions equal 12 inches on all set ups. The top chord size is critical in matching fascias, so if a top chord size changes for any reason, adjustments must be made accordingly. We will not take the width of the fascia board into account for this example. As a rule “1x lumber” is used for fascia board and is 3/4 thick.
mortgage refinance Frank Lloyd Wright opened his own architectural firm in 1893 in the Chicago south suburbs healthcare area of Oak Park. Many of his employees went on to major architectural careers, including Barry Byrne, William Drummond, Marion Mahoney, and Walter Burley Griffin. Wright’s early twentieth century residential plans, which came to be known as the Prairie Style, represented a new approach to architecture which resists categorization. At a time when the typical American home was designed with rectangles upon rectangles, Wright’s homes were human-scaled and flowing reflecting ideal conditions for living rather than rigid boxes within boxes. Prairie style architecture was conceived as modern architecture for a democratic American society. Distinguishing features of the Prairie style include horizontal proportions with flat stucco or brick walls, often outlined by strips of wood in contrasting colors; abstract, geometrically ornamental windows; and gable or hip roofs with widely overhanging eaves.
commercial property The freedom of design possibilities in timber framing is popular with planners. The structural strength of the beams is such that interior bearing walls are not necessary, making larger rooms possible, and useful loft areas more probable. The adaptability to the addition of skylights, solar panels, decks and balconies allow the planners to be very creative while increasing the overall efficiency of the home.
The ‘plumb’ of the stick = the vertical offset distance between the top and bottom edges of the lumber used for the top chord. It will vary depending on your roof pitch (slope). The higher your pitch, the deeper the plumb cut.
Plumb + Lug = OWH
Drop – OWH – match point = lug
OWH = Plumb + Lug
Drop = Y/12 (when over hang = 12, Y = roof pitch). Otherwise Y /overhang distance = Pitch/12: where Y = the overhang drop.
For our example here we will use 6/12, 8/12, and 12/12 pitches.
Example calculations
Begin with the 6/12 scenario (lowest pitch).
Plumb (+) Lug (-) Drop = Match Point
3-15/16″ (+) 1/4″ (-) 6″ = (-) 1-13/16″ (*)
Now that we have the match point the other match ups will be worked backwards, with the lug becoming the unknown factor.
8/12 scenario
Plumb (-) Match Point (-) Drop = lug (*)
4-3/16 (-) -1-13/16″ (-) 8″ = 2″
12/12 scenario
Plumb (-) Match Point (-) Drop = lug
4-15/16 (-) -1-13/16″ (-) 12″ = 5-1/4″ (**)
Explanations;
* Used to determine the match point. (Note that the match point falls below the top plate in this example resulting in a negative number, therefore it is added to the plumb, rather than subtracted from it.
** This heel needs a wedge between the top and bottom chords for plating purposes, and so that the two members meet. The square of the stick (depth of a 2×4 horizontally) is only 3 ½. This leaves a gap between chord members. Your truss fabricator will determine the size of the wedge needed to transfer the loads through the adjoining members. In the meantime, you just need to be aware that top and bottom chords do not always meet You can be published without charge. You can to republish this article in your website or blog. Please provide links Active.
Posted by Carlos Sagastume on October 2, 2010. Filed under HUD Homes.
You can follow any responses to this entry through the RSS 2.0.
You can leave a response or trackback to this entry
Recent Comments