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Where I started with this question was a Portland Cement Association web page advising against hard troweling air entrained concrete: https://www.cement.org/learn/concrete-technology/concrete-construction/finishing-air-entrained-concrete As well as the American Society of Concrete Contractors...

If you have a BRAB slab on grade design that is poured monolithically with some of the grade beam exposed on the exterior and the slab exposed on the interior, do you use air-entrained concrete or not? My thought is not to because patching an exterior spall is less of a problem than...

I misspoke on the webs. I was thinking of the internal webs due to the fact that you mentioned where the modified block internal webs will not line up with the typical block webs and create voids that the grout can run through. As I watch them take this wall apart, I am seeing that the...

Your description is correct. There is a row of CMU that has a continuous brick course sized notch where the brick course runs. From product information that I have found, that CMU block will have 2 webs instead of 1 as a normal block would have. I have typically pumped grout up into CMU cells...

I am reinforcing and an 13' tall unreinforced CMU wall built in the early 60's. The wall was 8" CMU with a flemish course of brick that tied the brick veneer to the wall making the effective depth of the wall 12". We have removed the brick veneer and I have to reinforce the block. I am...

Please see the attached picture and let me know if you recognize the deck profile. This is a roof deck on an approximately 60 year old bulding with foam insulation on top. The deck depth is 1 1/2", center to center of the ribs is 6 1/2", bottom of flute width is 1/2". It looks similar to an...

I have drawings of a building from 1968 that show a girder with designation 24BL55. It is a wide flange beam. The other beams on the project have designations such as 16WF40 which I can find. AISC design guide 15 doesn't show this designation either that I can find. Does anyone have any...

The project is southern central US.

The job isn't in my area, so I'm not sure who to call to get accurate pricing info. I don't want to use LVL or I-joists because it is and industrial facility in a high humidty room. So, I though pressure treated timber was the safer bet.

I have a renovation that will use members about 20" long holding up roof loads. I have 3x12 timber as the joists. Does anyone know if using comparable glulam members is more or less expensive? The project is in the southern US.

My worry about putting a new hanger where the existing hanger is is that new fasteners would go into existing holes and you could not rely on the connection. My idea is to mount wood between the joists with screws and then mount a new hanger into the new wood over the existing connection.

See the attached photo. It's a pretty generic hanger, although the closer grouping of the bottom 4 nails my give a clue if I could find some info from back then. My concern is that even if I find a similar gage and configuration, the strengths will not be the same just due to advances in...

Does anyone know where I can get historical information for wood to wood face mount hangers? The hangers I am looking at were installed in the late 60's.

Thanks for the information. Looking at the drawings, I find reinforcing called out for the concrete, but the wall just has a label that calls out haydite block. No mention of reinforcing or grout. It appears that he was confident that the builder knew how to build a haydite wall.

I have a simple design of a safety rail being mounted on a roof next to a piece of equipment. The posts of the rail penetrate the roof and will be mounted to the inside face of the masonry bearing wall below. The moment on the rail post will be taken by a masonry anchor at the bottom of the...

I am doing some light structural modifications to steel supporting a roof in a terrarium. Very high humidity. The existing steel is showing surface rust. Nothing that is drastically degrading the steel. I am going to have them clean the visible rust and paint all of the members. Does anyone...

Thanks for the help. That material gives a value of about 75 pcf. I looked at a modern system of an air entrained concrete that gives 50 pcf. The 75 value is much better than 110.

I have a building from the early 60's that has steel joist with metal form deck covered in a light weight concrete used for roof slope with the consistency of masonry grout. In looking at the available capacity of the joist, the current system seems to be overloading the joist capacity. I...

Thanks for the information. I will post a message tomorrow to let you know what I actually found.

I am going there tomorrow. I am trying to get an idea of what to expect when I get there.