I am trying to determine an STC rating between some apartment units that are on the upper floor with in an unvented attic. This is an existing condition where the demising walls go to the bottom of the ceiling of the unvented attic. The attic had blown in insulation above the ceiling that has...
I am in the process of hiring design professionals for overdue maintenance to about a 15,000 sqft office building that was built in 1980. After doing some investigation I realized that the ceiling plenum is being heated by two or three RTUs and then a large air handler brings in the heated air...
I am looking at the ANSI/AF&PA SDPWS - 2008 Table 4.3C
Does anyone know if you are allowed to substitute a screw with the same diameter and length for a cooler or wall board nail?
Has anyone used the combined section of a plywood or osb decking to the floor joist to limit deflection and increase the bending strength? If so what type of glue is recommended for this. Is this good practice?
Could anyone enlighten me with what may have caused this rubber membrane to get these air bubbles in it. The EPDM was used in an attempt to seal up a leak on a metal roof that had a galvalume finish. I am not sure what type of adhesive was was used to adhere it to the metal panel. Is the EPDM...
If I recall correctly I think we were allowed to add the gyp wallboard and the wood sheathing shear values together. Is that system still allowed. In the 2008 SDPWS I see that there is a table for wood over gyp and not sure what the reasoning behind this is. I will see if there is something...
I have been designing a structure to support a 10,000lb. vibrating conveyor that generates approximately 800lb. horizontal load and the frequency of the equipment is 9.5 Hz. The equipment sits approximately 20ft above the ground.
To keep the structure from resonating the frequency of the...
Need to create an opening in an existing 12" thick concrete wall that is above grade, and supported out of plane to the wall at the top and bottom and is about 18' tall with the opening sill at about 1' above the bottom. The opening will be 12' wide and 10'high and was putting a beam at the...
I am evaluating precast T planks for containing materials due to bulk storage, such as sand or salt and I am having a diffcult time determining how they make these work for overturning and sliding compared to typical cast in place retaining walls. Actually I am just making it for overturning...
Need some help in sizing the required area for explosion venting per NFPA national fire protection agency section 911. apparently the vent area is to be sized based on the room being designed for 100 psf outward pressure.
Does anyone know where I can find information or guidelines for designing a hollow concrete section. These could be beams with fixed ends, or slanted columns with the beams attached into them?
