![]() If the roof is built in a timber country, the lattice truss, as described in Section 12, may be employed. For longer spans it may be cheaper to use a segmental arch truss, as shown in Figs. If wooden trusses are to be used the Howe Truss will generally prove the most economical for spans up to 90 feet. If the spacing of the trusses exceeds 16 feet it will be more economical to support the ceiling joists on the tie-beam of the trussed purlins. If the ceiling is to be "strapped" or "cross furred" the joists may be flush with the tie-beams. If framed between the tie beams the bottom of the joists should be kept 1/2 inch below the bottom of the beams, to allow for furring the latter, if the laths are to be applied directly to the joists. The ceiling joists will naturally extend from truss to truss, either resting on top of the tie-beams, as shown at B, Fig. The forms of construction above described are also applicable to deck roofs, and the same principles apply to them as to flat roofs. If it is necessary to use shallow trusses, the purlins may be placed over every other joint as in Fig. The purlins should be spaced from 8 to 12 feet apart, according to the width of the panels of the trusses. 114, the trusses may be spaced from 20 to 24 feet apart. By bracing the purlins as shown at A, Fig. The use of purlins also permits of smaller sizes for the rafters and the placing of the trusses further apart. The advantages of the latter method are, that the purlins being placed over the joints of the trusses, no transverse strain is produced in the top chord, and the roof is better tied to the walls in both directions. This method answers very well for wooden roofs of moderate span, but when the span is 60 feet or over it will be more economical to support the rafters on purlins, as shown in Fig. 113, the trusses being made of different heights, so as to give the desired pitch to the rafters. The more common method, probably, is to rest the ends of the rafters directly on the top chords of the trusses, as shown in Fig. In supporting the roof from the trusses either of two methods may be adopted. As a rule,where flat roofs are supported by trusses, the trusses are placed across the building in parallel lines, with their ends resting on or built into the side walls. For pitch and gravel ( composition) roofs the rise should not be less than § inch nor greater than § inch to the foot for tin or copper, standing seam steel roofing and canvas roofing a pitch of 1/2 inch to the foot is sufficient, but there is no objection to a steeper pitch, unless it be that the steeper pitch requires the greater amount of material, and hence weighs and costs more. By the term " flat roof" is here meant a roof in which the rise is not greater than 1 1/2 or 2 inches to the foot, the exact pitch being determined by the kind of roofing to be used. ![]() Instead, your contractor will connect the flat roof to your existing shingle roof and finish the flat area with a modified bituminous membrane.47. Keep in mind though, that roofs with slopes less than 9.5 degrees cannot support shingles. It’s minor, but a slope is needed for water to be able to drain from the roof. A flat roof can be easily connected to the slop of an existing shingle roof, offering a contemporary look to the new addition.Although a flat roof may appear flat, it does have a slight slope. ![]() This choice is an excellent, economical way to add onto a home. ![]() Many folks performing renovation projects on their homes nowadays are opting for flat roof construction. So long as you use special care in removing the shingles initially, you will greatly reduce the amount of labor and materials needed to perform the job successfully.Ĭan you connect a flat roof to a shingle roof? Then, sections of shingles are removed and the final pieces of metal roofing are installed before the flashing is put in place.The final step is to replace the shingles across the transition point. To protect against water intrusion, you’ll need to install transition flashing along the line where these two roofs connect. The point where the two meet is known as the transition. In short, yes, you can join a metal roof to a shingle roof. In fact, screws may add greater withdrawal strength to your roof but must be appropriately sized by a professional.Ĭan you tie a metal roof into a shingle roof? However, this does not mean that screws cannot be used. This includes installing hardwood floors, framing walls, attaching siding, and installing roofing. Nails are often the preferred choice for performing structural joining. Related Questions Nails or screws for roofing? ![]()
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