garage trusses
garage trusses
(OP)
i have 9'7" celling in the garage, where i need to install a hoist,
i need to cut 2 or 3 trusses ,is this possible i would like some advise , there must be a way to support 3 trusses
i need to cut 2 or 3 trusses ,is this possible i would like some advise , there must be a way to support 3 trusses





RE: garage trusses
RE: garage trusses
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: garage trusses
RE: garage trusses
1) there is going to be no load what so ever pulling down on the trusses
2) I just want to cut a section out may be 5x10 section, so that when I lift a vehicle up with a 2 poster car lift , the roof of the car goes into the celing of my garage ( as i do not have the height)
the trusses are at 2 ft on centers with a span of 22 ft in length
there are verticle suppports to which I can give measurements
the lenght on the garge is 24 ft approx
So I will need to cut away at least 5 trusses at the main cord
Is this possible by supporting from the ground with metal vertical beams/ Jack supporters so without constructing whole new trusses which would mean tearing the roof off and starting fresh?
RE: garage trusses
RE: garage trusses
It is possible - but probably rather labor intensive and may be a bit expensive
Get an engineer well versed in wood truss design
RE: garage trusses
the centre is 2ft
RE: garage trusses
Garth Dreger PE
AZ Phoenix area
RE: garage trusses
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: garage trusses
I have pictures of the exact thing you are proposing. I had a client who cut out the bottom chord of some trusses so he could fit his car lifts in. However, I was not there to investigate the possibility of adding a car lift, I was there to replace the roof because the roof collapsed after he made the modification without consulting an engineer. Luckily nobody was hurt in the incident.
Again, what you are proposing is extremely dangerous. Hire a structural engineer and you will be able to sleep at night.
RE: garage trusses
RE: garage trusses
I agree with woodman on this one. There are nearly a limitless number of different truss types that you could sister to your existing trusses. Scissor, cathedral, scissor with horizontal tie,... The difficult part would be getting these trusses in place before you cut the bottoms of your existing trusses.
RE: garage trusses
I would not cut off any trusess until I have a support for it
the many cord is 24 ft with verticle angled support at 8 ft I have involved a roofing company that claim they have modified roofs such as mine
if I can get drawing as to where and what angle a support is needed then place the support in it's place I would cut one by one out creating my opening I need if I was to give the correct measurments of all the cords is there a possibilty that some one could provide me with the details I need to support my roof ?
RE: garage trusses
Don't get a roofing contractor to make structural modifications to roof trusses!! Let me repeat that...Don't get a roofing contractor to make structural modifications to roof trusses!! In most states that is beyond the license scope of a roofing contractor and therefore illegal.
What you want to do is convert existing trusses to a "tray" ceiling configuration. That's easy to do when the structure is built, but not so easy to do as an in place modification.
For all of those who have said it before in this thread, I'll say it again...GET A STRUCTURAL ENGINEER INVOLVED!!
RE: garage trusses
RE: garage trusses
i have 5 truses that need to be cut 5ftx10ft
5ft length of the main cord the cords are 2ft apart so 5 of the will give me 10ft.
RE: garage trusses
You've been advised by people who have many years of experience with this. We've seen what happens when someone does what you are proposing without adequate preparation, analysis, and safeguards. The result is not pretty and can be catastrophic, resulting in injury or death.
Get some local help with this from a structural engineer or truss engineer before you kill yourself or someone else.
RE: garage trusses