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Note you would be required to install sprinklers below the stair treads as well, not just the landings if the stair is over 4' wide. R M Arsenault Engineering Inc. www.rmae.ca

The presupposition that a sprinkler or sprinklers installed under fixed obstructions exceeding 4' in width require that heat be collected to activate the sprinkler is not the intent of the requirement. Think of a sprinkler under a duct over 4' wide. Heat may not collect too well here either...

It also should be added that not only must one be proficient in NFPA 13, 14, 20, 22 etc., but good sprinkler design requires one to know how to read plans of other building systems including structural, architectural and mechanical and fully understand what you are seeing. R M Arsenault...

Haha. Always good for a Monday morning chuckle SK. I'd say at least 50% of the hyd. signs I see are filled out wrong. R M Arsenault Engineering Inc. www.rmae.ca

Agreed! As Hunter S. Thompson said 'If something is worth doing, its worth doing right'. R M Arsenault Engineering Inc. www.rmae.ca

Travis you know what the big problem regarding flow tests is? NFPA 13 does not have mandatory requirements regarding how or with what equipment a flow test is to be conducted. 23.2.1.2(2010)simply states 'The volume and pressure of a public water supply shall be determined from waterflow test...

Clearly the roof slope exceed 2:12 so the storage protection criteria is outside the scope of Chapter 12 and 14-20 regardless. See 12.1.2 of NPFA 13, 2010 and read they commentary in the handbook as to why this is. All the testing done that NFPA used to determine storage protection criteria...

Haha, my bad the guys editing NFPA 13 must have missed this. I guess your're free to keep calling them sprinkler heads.... Don't take things so seriously. R M Arsenault Engineering Inc. www.rmae.ca

I thought from the title of your post 'sprinkler head question', you were going to ask why you keep calling 'sprinklers', 'sprinkler heads'! NFPA 13 never once refers to a sprinkler as a sprinkler head. Sprinkler heads are for watering your golf course. Just a peeve of mine. Bugs me almost...

pipesnpumps, I don't mean to be a thorn in you side but just for clarity regarding your comment(s): "...storage rooms that will be mainly storing paper files, cardboard, etc.....A room dedicated to their storage is misc storage. The miscellaneous storage of Cl.III commodities is OH2, plain as...

I would say no you cannot locate the sprinklers only below the 'perforated ceiling' as a 'thin acoustic pad' laying on top of the 'preforated ceiling' would never be considered as the same as a continuious ceiling that NFPA 13 considers to collect the heat to activate the sprinklers. And you...

Really firepe? Glad you're not my AHJ. You don't have to go into storage rules for a closet. With your logic every occupancy would have to be protected to OH2. R M Arsenault Engineering Inc. www.rmae.ca

....My curiosity got the best of me. Further to my previous post, I ran a little example through Autosprink doing a 4 sprinkler calc. vs. a 5 sprinkler calc. The difference is more significant than I expected. R M Arsenault Engineering Inc...

Hmmmmmm. You're right about the pipe sizes likely having no effect in most cases but if an AHJ told me that I have to submit a five sprinkler calculation to prove the use of residential sprinklers that I might have spaced at 18' or even 20' (where the listing flow would trump the 0.10 density...

SKDESIGNER, You are only saying that the Georgia state fire marshal is correct in that when residential sprinklers are utilized as permitted in residential portions (and adjoining corridors) in NFPA 13, 2010 protected occupancies the minimum density must be 0.10 gpm/sq.ft? The marshal is going...

Recall nfpa 13 recommends nfpa 291 for hydrant flow testing. Nfpa 291 recommends that a flow test to be utilized for a sprinkler system should either be flowed to the design flow of the system or until the residual pressure drops 20%. Neither parameter was met in this case. I would reject...

This is an assembly occupancy so commercial. The main criteria for use of the room design method is the requirement to calculate the demand of a room that has a fire separation that is equal to the required water demand duration. An attic is a light hazard combustible concealed space. If the...

I agree. The hatches are my concern too. R M Arsenault Engineering Inc. www.rmae.ca

As a combustible attic space frequently governs the water demand requirements,the cost of water storage and pump capacity can be lessened by having the /architect contractor separate the attic into 30min. rated compartments with self-closing access hatches between compartments which would...

Agreed. Separate buildings as defined by the NBC absolutely requires zoning sprinkler and fire alarm zoning regardless. Always be cognizant of the standpoint of the fire fighter who is responding to a fire situation which is the main reason for zoning. If a sprinkler system has controlled a...