Hello!
Today it is evident that the existing roof trusses (just over 8m free span with about 1m between each) have not quite sustained the load over roughly 30 years.
(The ceiling has sagged 5-10cm).
Load from the roof - no idea. (but the previous owners have usually shoveled the roof once a year.)
The current plan is to support a number of trusses with a beam from a glulam (6.3m), placed across the trusses.
Should the ceiling (wood panel) be removed before the support beam is pressed into place? (or will the panel hold the pressure?)
I'm considering the sizing of this glulam beam. I want to retain as much ceiling height as possible under the beam.
The dimensions I've spontaneously considered are:
56x225x6300
56x270x6300
90x225x6300
90x270x6300
Is there any table/program that shows what load each dimension can handle?
(maybe these dimensions are too weak or will be vastly over-dimensioned.)
Today it is evident that the existing roof trusses (just over 8m free span with about 1m between each) have not quite sustained the load over roughly 30 years.
(The ceiling has sagged 5-10cm).
Load from the roof - no idea. (but the previous owners have usually shoveled the roof once a year.)
The current plan is to support a number of trusses with a beam from a glulam (6.3m), placed across the trusses.
Should the ceiling (wood panel) be removed before the support beam is pressed into place? (or will the panel hold the pressure?)
I'm considering the sizing of this glulam beam. I want to retain as much ceiling height as possible under the beam.
The dimensions I've spontaneously considered are:
56x225x6300
56x270x6300
90x225x6300
90x270x6300
Is there any table/program that shows what load each dimension can handle?
(maybe these dimensions are too weak or will be vastly over-dimensioned.)
I have been trying to understand how I could utilize this, but have failed. The big calculation on that page is what different things weigh (like snow load / insulation / sheet roofing, etc.) to give a beam as a result. My wish is to be able to compare the strength of different beam dimensions. It might be enough to calculate the bending resistance and compare? (I believe the formula for bending resistance is: W = (bh^2) / 6)
The next step is to figure out - what will the deflection be from, for example, a load of 2000kg cars.
The final step this round is to find out the weight of these beams.
Now maybe it has crystallized which 1-2 dimensions would work. (emotionally)
Since the trusses will remain unchanged and continue to support the roof, this beam will only help the trusses not to be compressed so much. But this beam will have over 6m between supports, which is quite a lot in itself.
The next step is to figure out - what will the deflection be from, for example, a load of 2000kg cars.
The final step this round is to find out the weight of these beams.
Now maybe it has crystallized which 1-2 dimensions would work. (emotionally)
Since the trusses will remain unchanged and continue to support the roof, this beam will only help the trusses not to be compressed so much. But this beam will have over 6m between supports, which is quite a lot in itself.
if it is a one-story you can prop it up, and then reinforce the roof trusses so they can handle the load?
It is an extension to a barn built as a garage/machine hall with a slightly too flat roof.B Boan said:
The image has slightly odd proportions (about 8.5m wide) - the left door is 2.5m and the right one is 2.7m wide.
Reinforcing about 6 trusses, when the distance between the inner and outer roof is small, is not easy.
(or I don't know how it can be done)
The entire building is about 10-11m deep - but after the garage section of 6.3m, there are partition walls, etc. that provide support.
how are the trusses constructed today? i.e., what type?A Albireo said:
I can't answer that off the top of my head - but if I remember correctly it's a truss W or WW with arms that are far too weak. (don't remember either - 195x45 or maybe 225x56) but the span is long between the supports.