Results 1 to 5 of 5
Thread: ISO Class III...??? (or I)
-
07-14-2018, 01:09 PM #1
ISO Class III...??? (or I)
hello again...
In my travels this week, I inspected a building that had:
Steel Roof Trusses
Metal Stud Exterior Walls, sheetrocked on the inside; & sided w/ T1-11 wood panels on the exterior (at least I believe they were metal studs...looked like 2X6 nominal...maybe cold-formed load bearing exterior wall metal studs?)
The building was constructed in the 1990's (according to the insured).
Is this an ISO Class III (light non-combustible)...???...or is it ISO Class I simply because it's frame construction?
(reason I'm asking is...I've never come across steel roof trusses on a frame building)
thanx,
MF
Similar Threads:
-
07-14-2018, 03:02 PM #2
Re: ISO Class III...??? (or I)
My first question is - Why are you asking the ISO Classification? For what purpose?
After that, you did not give enough information - here are some links which may either help or confuse the matter (based on what is written as what is Class I and Class III):
http://www.upfro.com/Inspectors/ISO%...on%20Class.htm (note that Class I says "light-gauge metal)
https://www.guc.com/Data/Sites/1/med...efinitions.pdf
https://www.irmi.com/docs/default-so...n.pdf?sfvrsn=6
http://www.amrisc.com/Amrisc%20pdfs/...scriptions.pdf
https://www.sorm.state.tx.us/wp-cont...sification.pdf (may be the best help as it provides a relationship to the building code types of construction)
I would start be finding out what type of construction the building is, then use the last one above to relate that to the ISO Classification.
However, as a home inspector, if you are a home inspector, why are your identifying ISO Class/Type of Construction?
Last edited by Jerry Peck; 07-14-2018 at 05:14 PM. Reason: "(based on what is written as what is Class I and Class II)" ... should have been "Class I and Class III"
-
07-17-2018, 10:33 AM #3
Re: ISO Class III...??? (or I)
ISO 1 - Frame Construction (Wood walls & Roof, foundation construction does not matter) Masonry Veneer or accents still count as ISO 1.
ISO 2 - Joisted Masonry - Free standing Masonry shell with wood floors and joists, flammable roof. (If structure burns, masonry walls remain)
ISO 3 - Light noncombustible - Structure does not add to fire (fuel) load of building but does not resist fire well. Light steel construction.
ISO 4 - Masonry Noncombustible - Free standing masonry walls with noncombustible floors and roof.
ISO 5 - Modified Fire Resistive - Walls between fire divisions in structure have 1-hour fire rating. Noncombustible structure.
ISO 6 - Fire Resistive - Walls between fire divisions have 2-hour fire rating, otherwise noncombustible structure.
Peak Inspection Services | Over 34 Years of Contractor Experience!
Residential Inspections | Commercial Inspections
Office: 908-750-6789 | www.peakinspectionservices.com
-
07-17-2018, 02:39 PM #4
Re: ISO Class III...??? (or I)
-
07-17-2018, 06:23 PM #5
Re: ISO Class III...??? (or I)
I used to do commercial risk management & loss control inspections back in the day and what I posted above (although it can get more detailed based on hourly fire resistance ratings) is what every insurance company I dealt with used to determine ISO class.
https://www.assetworks.com/wp-conten...ifications.pdf
https://www.sorm.state.tx.us/wp-cont...sification.pdf
By the way, I never came across any insurance company that included "light-gauge metal" to qualify a structure to be in the ISO 1 classification.
Peak Inspection Services | Over 34 Years of Contractor Experience!
Residential Inspections | Commercial Inspections
Office: 908-750-6789 | www.peakinspectionservices.com
Bookmarks