Truss framing layout 2

[dgkhan]

I postedt on truss framing forum too but usually I do not get any response by the time I need it. So sorry for double dipping. I have attached a proposed lay out of pre-engineered roof trusses. Plan and tried to draw a 3d. Can you please guide waht mistakes I am doing here?

 

[dgkhan]

second picture

 

[dgkhan]

it is 60 feet x 58 feet

 

[rowingengineer]

dgkhan,
I am a structural hard head and what the truss guys do most days of the week make me wonder, so my comments are based on structures not truss manufacturers logic.

If i was to look at the page as you have posted i would call the top N, right E, bottom W and left W. looking at the NW area, you need to take into consideration that the truss cords are not in a good orientation for the battens to attach or the wall to attach. I would be tempted to put in another hip girder and a few more jacks. maybe move the girder from the far w to closer to the center.

Arguing with an engineer is like wrestling with a pig in mud. After a while you realize that them like it

 

[BAretired]

I don't think there is much wrong with what you have done. It would be more in keeping with local practice to maintain a distance of 8' from wall to Girder Truss as shown on the attached plan.

Intermediate trusses simply follow the line of the ceiling and the line of the roof.

The tricky part is figuring out the shape of each individual truss. I find that most suppliers in my area do not do it properly. They determine each truss configuration according to the most economical layout for that truss, without regard to adjacent trusses. This is wrong!!!

The technician designing the roof system should override the computer default for any particular truss in favor of a configuration compatible with adjacent trusses, particularly with respect to bracing of web members.

BA

 

[rowingengineer]

BA, did you mean to attach a plan?

Arguing with an engineer is like wrestling with a pig in mud. After a while you realize that them like it

 

[BAretired]

Sorry, yes I thought I had attached a plan. I attach it now.

BA

 

[dgkhan]

rowingengineer
I tried but could not get u. Can u please mark up on my drawing, what u r proposing. OR any sketch will be helpful

 

[rowingengineer]

dgkhan,
Please see attached, the proposed truss layout is only a possible, would spend more time developing it if you were to go this way. as suggested by others talk to the local guys. they know best.

Arguing with an engineer is like wrestling with a pig in mud. After a while you realize that them like it

 

[dgkhan]

Thank you ROW and BA

 

[hungnguyen712]

If you take the plan to a truss company they may change your plan from using ridge beams to G.T.
And when doing layouts definitely beaware of slope changes as rowingengineer pointed out.

 

[dgkhan]

I have a situation on this roof. One side is at property line so if roof doesnot over hang, water and snow will flow over walls. Any solutions other than moving wall into the property. (We can make foundations in adjacent property)

 

[BAretired]

Is the property line at the exterior face of one wall? Which wall? Is the property owned by a neighbor or by the municipality? What is the minimal dimension from the property line by municipal regulations?

In my area, regulations do not permit a building to be so close to a property line.


BA

 

[dgkhan]

It is parking right now for commercial plaza. North wall.
We are cutting down at south side 5 feet for future road widening so city will not mind if neighbours are ok

 

[BAretired]

I think it is a matter of law, not engineering. You would need to get approval from the municipality and written agreement from the neighbor, an agreement which would have to be binding on subsequent owners.

BA

 

[dgkhan]

Thanks BA
"binding on subsequent owners." this was good one.