need help with roof truss
tomslildeere
15 years ago
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rjoh878646
15 years agodavidandkasie
15 years agoRelated Discussions
Roof - Trusses or Stick frame?
Comments (12)I believe residential roof trusses represent a false economy for a roof with a ridge height over 8 ft because the potential value of that space for future use is many times greater than the initial savings. In renovations, existing trusses have prevented me from adding elevators, skylights, and cathedral ceilings so they have not only cost me design fees but made me acutely aware of how shortsighted it is to use them. So, I would say roof trusses make sense for developers or for a custom designed house with a roof slope lower than 6 in 12 or if the owner doesn't plan to own the house for very long. But it is hard to put a price on drywall cracks from truss uplift. I haven't found a reason to specify a roof truss in 40 years nor has anyone ever suggested that I do so....See MoreRoof truss problem
Comments (2)Codes do not allow trusses to be altered without the approval of an engineer. Whatever method you end up with to correct the problem, it will normally need to be designed and signed off by an architect/engineer and would require a building permit in most cases. That said, I would opt to simply replace the entire top chord of the truss with a new staight 2x4....(under an engineer's direction, of course). Not that big of a deal. It would involve removing and reinstalling the gusset plates, cutting the nails which secure the sheathing with a reciprocating saw, some temporary bracing, and a single straight 2x4 of adequate length....See MoreTrusses on my roof
Comments (10)Usually, the dips(if the dips are between the trusses) are caused by roof sheathing that is too thin. That allows the weight of the shingles to bow the sheathing. Example: Roof trusses are set on 24" centers(24" from the center of a truss to the center of the next truss). That is allowable by building codes. The sheathing is 1/2" (actual 15/32") plywood. That is also within most building codes. However, the 1/2" sheathing is not strong enough to hold the shingle weight without bowing between the trusses. It is not going to fail, but looks terrible. Solution is to remove all the shingles, tear off the thin sheathing, and replace with 5/8" thick sheathing....See MoreWant to vault ceiling - Need Truss modification help/ideas
Comments (3)You may not alter the bottom chord of the trusses or the roof will fail. It is possible for an engineer to redesign the trusses, but it would probably require enough framing and care in the connections that it would be more $ wise and easier to just top off the roof and stick build....See Moretomslildeere
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