Roof truss
Roof truss
(OP)
Hi:
I am working on an old apartment building with roof slope of 12:12 (varies in some area). The roof is approximately 28' by 60'. The architect is preparing the plans at this time and I do not have the exact layout yet. The roof has several hip/valley/ridge lines and the floor joist run perpendicular to the roof rafters. I need to replace the roof rafters with the roof trusses if possible. Is there any "attic space" style truss that can meet our roof layout. Attached is a preliminary cross section of one of the roof area and the roof trusses are shown in magenta color (yellow color is existing members).
Thanks
I am working on an old apartment building with roof slope of 12:12 (varies in some area). The roof is approximately 28' by 60'. The architect is preparing the plans at this time and I do not have the exact layout yet. The roof has several hip/valley/ridge lines and the floor joist run perpendicular to the roof rafters. I need to replace the roof rafters with the roof trusses if possible. Is there any "attic space" style truss that can meet our roof layout. Attached is a preliminary cross section of one of the roof area and the roof trusses are shown in magenta color (yellow color is existing members).
Thanks






RE: Roof truss
BA
RE: Roof truss
RE: Roof truss
RE: Roof truss
RE: Roof truss
Michael.
"Science adjusts its views based on what's observed. Faith is the denial of observation so that belief can be preserved." ~ Tim Minchin
RE: Roof truss
The best thing you can do here, if you do not want to stick frame the areas where the floor joists are perpendicular to the rafters, is to raise the structure height by a foot or so in that area (you may not have to if you change the pitch of the trusses), and put the trusses on top of the existing floor framing. You will have to tear off the existing roof structure to do that. When the trusses are designed, you will also want to keep the bearing points of the new trusses as close to the original bearing points as possible to avoid changes to the stories below.
Mike McCann
MMC Engineering
RE: Roof truss
RE: Roof truss