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Unless his "concealed space" meets the requirements below, then protect beyond the 20x20 space until you get to full height walls. 8.15.1.1 to 8.15.1.2.18.4 (2010 edition of NFPA 13). There may be something about the tiles being required in the IBC or IFC, but NFPA just says to do what I listed above. Travis Mack MFP Design, LLC
Concealed fastener systems can accommodate lower slopes, but they also generally require steps at the ends of sheets. As well as consideration of slope, the length of run and the intensity of rainfall will determine if a given profile can carry the volume. Follow the manufacturer's recommendations.
allowable unsprinklered concealed spaces. 8.15.23.2 Where the space above a drop ceiling is sprinklered, the sprinkler system shall conform to the rules of. 11.1.2 and Section 12.3. 8.15.23.3* Where there is a noncombustible space above a. noncombustible or limited-combustible drop ceiling that is. sprinklered because it is open to an adjacent ...
for example, 2007 nfpa 13, section 8.15.1.2.2 says concealed spaces of noncombustible and limited-combustible construction with limited access and not permitting occupancy or storage of combustibles shall not require sprinkler protection. the space shall be considered a concealed space even with small openings such as those used as return air ...
Structural. For starters, I have referenced this prior thread Link. Existing design criteria: 1) Ex. 21WF62 A36 Steel Beam. 2) Beam is 18'-0" long simple span with standard shear connections to supporting girders. 3) Beam is non-composite and carries a 4" thick concrete slab. 4) Design loads are DL=25psf (superimposed) & LL=200psf (industrial use)
1) The column should be as initially plumb-able as with a typical base plate detail. 2) The column orientation should be able to be field adjusted later in the erection program to suit floor construction etc. 3) The column should be sufficiently moment connected to the slab to satisfy OSHA requirements.
1st, start with the premise that all areas of a building must be provided with sprinkler protection. Then, you can go to the exemptions that allow sprinklers to be omitted. One of these is non-combustible concealed spaces. Because your ceilings aren't 100% coverage of the room, the space above the ceiling is no longer concealed.
You could pour the new footing under the existing footing. You would need to design the new footing for its own bearing stress plus the bearing stress from the existing footing.
If so, it then sends you to NFPA 13 which recognizes areas below a raised floor as a concealed space, and requires suppression if there are combustibles. If the cables are plenum rated, many authorities will not call the cables combustible, although in truth they are, and not require suppression below the floor.
276. GB. ASME VIII Div 1, UG-99 allows painting before hydro except for items in lethal service (well it does in the version I have). However it does point out that paint could mask leaks which would otherwise be visible. No client I have ever worked with has accepted external or internal painting or coating prior to hydrotest.