CONVENTIONAL ROOF SYSTEMS                 Conventional roof systems are being more widely used with log homes; therefore, this section will offer brief information concerning conventional roof system installation.  Refer back to the section on Premier Roof Systems.                 The basic differences in conventional and Premier Roof Systems should be noted.  The Premier Roof System framing consists of 3x12 ridge beams and valley rafters and 4x8 main rafters and collar ties with 2x6 tongue & groove decking on top.  Overhead wiring is run on top of the 2x6 decking.  The bottom side of the 2x6 decking (V-groove side) functions as the interior ceiling, and all rafters are exposed.  A vapor barrier and vented roof insulation panels are installed as the next layers on top of the decking.  The final layer on topof the insulation is 7/16-inch OSB.  Felt (optional) and finished roofing are then supplied by the owner.  The exterior roof overhang areas are left exposed and are not enclosed.                 Conventional roof systems are framed by either stick-building with 2x rafters or by using pre-manufactured roof trusses or a combination thereof.  Collar ties made from optional 4x8 material may be used with the 2x framing and left exposed to view from within the home, giving a cathedral ceiling look.  If a flat ceiling is desired upstairs, simply use the standard 2x collar ties.  All other framing is not exposed to view.  Once the roof is framed, the exterior sheathing, 7/16-inch OSB, is applied using plywood clips to prevent sagging between rafters.  Felt and finished roofing are the last two layers.  Soffits may be built with rough sawn plywood (with ventilation) to enclose the roof overhang areas.  Other soffit material could be tongue & groove pine or cedar deckings; vinyl; exterior wood paneling.  The entire perimeter of the roof system should be covered with 1x fascia to hide the framing.  Wiring is run from underneath (inside the house), through the trusses or rafters.  Insulation is also applied from underneath after the rough-in electrical inspection is performed.  It can either be blown in or regular batt insulation may be installed.  The covering for the ceiling (sheetrock, 1x tongue &groove, etc.) is attached to the bottom of  the rafter collars or trusses.  If optional 4x8 collars were used, they will be left exposed for a cathedral ceiling look.                 Another difference between conventional roof systems and the Premier Roof System is cost.  Conventional systems are considerably less expensive from the standpoint of both materials and labor, and, with conventional roofs, the home is “in the dry” faster as well.  Both roof systems offered by Tennessee Log Homes have their merits.

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