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From the supply yard side (the people that actually cut and deliver the I-joists), it is easier for the designer to specify the depth, loading, max on center spacing, and performance requirements and let them determine everything else. Sure, this seams vague, but there are many manufactures...

Wow, 60 sounds pretty large for construction. I did go through the SDI MOC2 and believe they use the larger of 50psf construction or weight of concrete + 20psf. This actually makes sense to me. RARMBJ, what do you mean by "construction related problems"? BTW, Thanks for responding!

I am trying to understand why the steel guys use 20psf for construction load while the concrete guys use 50psf. The IBC2006 references the ACI which ACI 6.1.5 references ACI R347 where it states in 2.2.1 "The formwork should be designed for a live load of not less than 50psf of horizontal...

Wouldn't this depend on the type of garage slab you have? If the slab is like mine in my home, with a grade beam and turned down rebar tied into the basement (retaining) wall, I could technially remove all the dirt under this slab and it would still support the weight of my vehicles. In this...

Kudos csd72! I've done the same and it works pretty well. Simpson could probably make you a connector for 25K, but why when you can design your own! Where did you find 7" wide LVL? The largest I'm aware of is 3 1/2" and is difficult to find.

I missed the exterior part. LVL and LSL must be weather resistant. Consider using a "boxed" condition where you route the stringers 1/2" for the treads and risers. Even then, a PT 2x12 SYP fails for a 14' span. You did not give a width, so it would be hard to say what really works. I would...

Consider using LSL stringers ilevel has literature for this application. http://www.ilevel.com/interior/i_TimberStrandLSL_stairstringer.aspx I've used Master Plank for this also, but with LVL. http://www.finnforestus.com/countries/default.asp?path=1774

Funny, In the South, most brick homes are designed using the wood members (usually LVL, LSL, or PSL) to support the brick lintel that is almost always a L6x4x5/16. The Northern Virgina market and North never allow wood to support the brick. I would prefer for the lintel to be designed to carry...

Yes, I have taken and passed both the Civil (structural afternoon) and also the Structural I.

cedent, Did you say you live in Georgia? I moved to Georgia having my PE from another state by taking the civil exam with the structural afternoon. When I applied for reciprocity for my GA license, it was denied since my experience was in structural and my test was in civil. The real kicker...

...and deflection would be greater.

Wow, this is confusing. Smokiibear, are you trying to add a steel plate to the bottom of the beam (flat) or to the side of the beam (Vertical)? I don't understand what you are talking about with the "center of the beam". If plate is in Vertical orientation, get a transformed moment of inertia...

Before giving advise about a problem that I don't have all the information to, I would recommend you either calling your lumberyard, TJ rep. in your area, or Simpson Strong-tie. TJ website: www.ilevel.com (they recently changed names, again...) Simpson website: www.strongtie.com The...

Ron, 1st subject: Yes, the ridge must have posts or solid bearing that transfers 1/4 the area of the roof the ridge beam is supporting at each end. The rafters must be attached to the ridge beam to account for the vertical (I prefer sloping hangers) and horizontal force (usually a strap tie...

Glulam may work structurally, but not in the time schedule for fabrication of the stairs. Built up plywood beams have been used for years according to people in the stair industry, but how are they designed? I'm starting to think they are using the overall stiffness of the completed stair to...

Section 802.3.1 in the 2006 IRC was rewritten and is easier to understand. My interpretation below... A structural ridge IS NOT required if the ceiling joists are parallel to the rafters, connected per table T802.5.1(9), and the adjustment factor from footnote "A" of Table R802.5.1(1) & (9) is...

I have a curved stair that is free standing (not connected to a wall) and was wondering how others designed the stringer. I know how to do this if I were using steel, but the requirements are to be wood. The proposal is to use 10 strips of 1/4" plywood (glued & nailed) to make the beam. I...

I think the code guys intended for the ridge beam to be structural (trib area = 1/2 the rafter span) when no collar ties are present, as in cathederal ceilings. The reasoning is there are no ceiling joists to take away the horizontal force that collects at the walls which roof trusses have with...