binders ?

[dirtydeeds]

this might be a pond issue as to description

and i would highly value a north american opinion

to me a binder is fixed above and perpendicular to ceiling joists (in the roof space)

it is essentially a single stiffener to the joists (instead of installing a number of blocks) between each joist

my question comes about because i have an architect (who's design says) that that you can strut purlins off a binder

i dont agree. end of

because normal size ceiling joists (stiffened or not) cannot support half the roof load imposed (through a purlin strut)

at this stage in the tendering process, i'm not willing to pay a structural engineer's fee, just to confirm the "bloody obvious" and piss the architect off as well

i want this job because it is complicated

but IT MUST BE RIGHT, and i wont put my name to a bad constrution

its got three blind valleys (off split pitch roofs) off the back of the building (thank goodness they are right angles)

AND

a dual pitch (with sprockets) IE 3 pitches off the front of the building

and i guess to end this

if this architect likes complicted roofs, i want him to call me back for more jobs

 

[Rob Z]

Hi Tom

From what you are describing, I think the word we use for this is  a strongback , which typically is a 2x4 nailed flat on top of the ceiling joists, with a 2x6 nailed to the side of that 2x4 (so that the 2x6 is standing at right angles to the 2x4).  THe strongback runs across the ceiling joist at right angles.

Thinking back to all the old houses we have worked in, I don't recall seeing any of the roof framing being tied into the strongbacks.  I agree with you that this should not be done on your job, but I don't have the engineering experience to back up my opiniion.

Let me find a link for you , at a site where you can get some good framing advice.

 

[Rob Z]

Hi Tom

Here is a good forum to get some answers to your questions...these guys are all framers in the US and Canada.

http://forums.jlconline.com/forums/forumdisplay.php?f=11

 

[dirtydeeds]

thank rob, ill join and have a word or two