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A client purchased an existing pre-engineered metal building. The walls and roof have about 4" vinyl-backed fiberglass insulation, which is typical in the metal building industry. The client has what we thought were roof leaks, but there appears to be a more serious and widespread problem with...

From past, painful experience.... Be careful to investigate how the plywood will be attached to the metal studs. We built a partition wall with 1/2" plywood on each side of metal studs. The screws kept stripping out of the metal before the plywood would draw tight to the studs, resulting in...

The wire mesh is continuous through the cracks. It is a slab on grage (SOG). No corrosion is involved. The slab was poured in Mid-July (ambient temperature approximately 90 deg F.) The cracks were not noticed until mid-October (ambient temperature at mid-60's). There has been some forklift...

We poured a 6" thick concrete slab, reinforced with 6x6-W2.0xW2.0 wire mesh. The contraction joints were sawn at 15' x 20' centers. (Let's leave the debate over proper joint spacing for another day!) I now have some very narrow cracks running in the middle of the 20' bays. The cracks are...

This is WAY off subjet, but... We fold a lot of blueprints and technical cut-sheets for incorporation into 3-ring binders. This means the documents get 3 holes punched in the margins. Some years back, I saw some instructions on the best way to fold large print media (24"x36" and...

A wise old engineer advised me to do this when I started out 18 years ago... Get a big three-ring binder, and anytime you run across some useful information, put it in there. Items such as magazine articles, calculations from other engineers, formulas, etc. You'll be surprised how often you'll...

I have a book "Designing Floor Slabs On Grade" that does a good job of explaining things. I was hoping to find a similar publication regarding suspended slabs. I'm especially interested in trying to use some composite decking to eliminate shoring. I'm not sure that ACI 318 addresses...

I have to design a retrofit suspended floor slab on the second floor of a 5-story warehouse. The floor is to support a live load of 150 psf, along with a forklift load of 4.0 kip per wheel on a 40" wheel center (8.0 kip per axle). The existing columns bays are spaced 10'-8" x 25'...

Thanks for the information. I never intended to make my own crane beam, I just needed some additional sources for the beam. Sounds like there is a bit of a supplier monopoly on this! The Whiting Crane book is a good resource. I have one as well. Thanks again.

I'm extending an existing 7-1/2 ton monorail beam. The beam is a "patented" welded plate beam spanning 28' between supports. The existing beam measures 18.75" tall, with a 5/8"x10" wide top flange, a 7/8" x 3 1/4" wide bottom flange, and a 5/16" thick web...