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Number for UL rating
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Re: Number for UL rating By  jdrobysh

Posts: 0

5/22/2009 8:08:00 PM

Powderhound - As far as I know you have to be a member to access the info on the web, or a Government Office. Now if you were an AHJ you could get the discs for free...

Check with your friendly neighborhood Building Department and ask if they have them. Most will gladly share if they do.

I''m not in my office or I would look it up for you.


   

Re: Number for UL rating By  RLGA

Posts: 0

5/22/2009 10:02:00 PM

You don''t need special access. Here''s the link:

http://database.ul.com/cgi-bin/XYV/template/LISEXT/1FRAME/index.html

On the right-hand side there is a dropdown field called "Specific Searches." Select "Fire-resistance-rated Systems and Products."

On the new page under the title "Fire-Resistance-Rated Systems and Products," click on the link "Fire-resistance Ratings."

In order to narrow your search, in the box on the left-hand side, click on the link "Numbering information for Fire-resistance Design." This will open a new page that has a table with the letters and number ranges. Since you''re looking for a wall, scroll down to "Wall and Partition" located in the left column. You''ll notice that U, V, and W are the letters. The asterisk for the W means that it is reserved and no numbers are assigned to that letter, therefore, all assemblies will either be a U or V.

In the row for "Wall and Partition," move across until you find the construction closest to your assembly. In your case, "Wood Stud, Gypsum Board, Lath &/or Plaster" would be the choice (If you go to the top of that column, you''ll see that the number range is 300 to 399). Click on the link within that box and it will open a new page with all the wall assemblies for that type of construction.

To filter the list further, click on the "Refine Your Search Link" and you can enter additional filter criteria. For "Keyword" you can enter "stucco" and for "Fire Resistive Hourly Rating" select "1". That will filter the list down to 3 assemblies--find which one suits your condition.

If the exterior wall is more than 5 feet from the lot line, then the fire-resistance rating is only required for a fire exposure from the interior. If the lot line is 5 feet or less from the exterior wall, then the wall needs to have a rating based on exposure from both sides.

There are other sources for determining fire-resistive construction. The nonproprietary assemblies of GA-600 can be used. Also, you can use the calculated method of Section 721.6 for wood assemblies.

If you use the calculated method, the studs will give you 20 minutes (Table 721.6.2(2)), the gypsum board--must be type X--will give you 25 minutes (Table 721.6.2(1)), and you need to add insulation to give you the remaining 15 minutes (Table 721.6.2(5)). This will give you 60 minutes for an interior fire exposure.

For exposure on the exterior side, it''s a little trickier. You get 20 minutes for the studs, 10 minutes for the plywood, 15 minutes for the insulation, and (here''s the tricky part) 20 minutes for 3/4-inch stucco using Table 721.2.1.4(2) for a total of 65 minutes. The reason that this is tricky is because the table with the assigned time for stucco is provided in the concrete assemblies section and not the wood assemblies. But, when you compare Table 721.2.1.4(2) with Table 721.6.2(1), the assigned times for all the materials they have in common are equal--why the stucco materials were not included in the wood assemblies, I don''t know. I have successfully received approval from AHJs to use the assigned times for stucco materials with wood assemblies.


   

Re: Number for UL rating By  jdrobysh

Posts: 0

5/23/2009 9:38:00 AM

RLGA -

Well done! Thanks for the link... it''ll come in handy when I''m not in the office.


   

Re: Number for UL rating By  Powderhound

Posts: 0

5/23/2009 10:31:00 AM

Thanks RLGA,

I did get a wall assembly that could work. I did it the hard way before I got your response I went through about 40 different wall assemblies. I did not see the refine search option at the bottom; oops live and learn.

The building department is requesting this information from me.

The reason I need this I have a detached concrete block garage that is 3"-3" from a one family house that is on the same property. The code calls for (Section R302) "The exterior walls with a fire separation distance less than 3 feet shall have not less than a one-hour fire resistive rating with exposure from both sides". What does "exposure from both sides mean"?

I did notice on the wall assembly that I found (design no. U356) that it says "exposed to fire on interior face only", why on the interior and not the exterior. When they ask for a one-hour fire resistive rating are they concerned with flame spread. In the U356 report it indicates that you are permitted to use wood structural panel or lap siding on the exterior or vinyl siding.

Are we concerned with a fire spreading from one building to another if so how are we able to use wood siding, please explain.

On the wall assembly (U356) it doesn''t indicate building felt or house wrap. I usually indicate a Tyvek stucco house wrap. Not sure why it doesn''t indicate this.


   

Re: Number for UL rating By  RLGA

Posts: 0

5/23/2009 4:15:00 PM

Powderhound:

I appears you''re in the 2003 IRC. The 2006 IRC has increased this distance to 5 feet, which is similar to the IBC.

I''m not as familiar with the IRC as I am with the IBC, but in reading R302, it states that a 1-hour wall is required when the fire separation distance is less than 3 feet. This is based on location on the lot and not with buildings on the same property. I don''t think the requirement of R302 applies in this case (unless, of course, your residence and/or detached garage is less than 3 feet from the lot line).

R309 covers separation of garages from their associated residences. If your garage is constructed of concrete block, I think you have sufficient projection (not to mention the added protection of physical separation). The concern is to protect the occupants in the residence from the higher fire potential in the garage--not to protect the garage from potential fire exposure generated in the residence. The concrete block wall will proved at least a 1-hour fire-resistive rating if not more.

As for the "interior exposure," these assemblies are for buildings complying with the IBC when the exterior wall is required to have a fire-resistance rating based on fire separation distances in Table 602, which is from 0 to 30 feet. But, when the distance is 5 feet or less, then the exterior wall is required to a fire-resistance rating with exposure on both sides because of the concern of fire exposure from buildings on adjacent lots.


   

Re: Number for UL rating By  Powderhound

Posts: 0

5/23/2009 5:34:00 PM

Thanks RLGA,

I''m working in New York we have a revised version of IRC. What I''m using is the 2007 Residential Code of New York State.

The definition of Fire Separation is;

The distance measured from the building face to the closest interior lot line, to the centerline of a street, alley or public way, or to am imaginary line between two buildings on the property. The distance shall be measured at right angles from the lot line.

3''-0" from the garage to the imaginary line, and 3''-0" from the house to the imaginary line; for a total of 6''-0"

It does say "two buildings" not a dwelling and garage. In my opinion this applies to all scenarios, two houses on one property, or a house and garage on one property.


   

Re: Number for UL rating By  RLGA

Posts: 0

5/24/2009 2:20:00 PM

If I understand the NY IRC and your situation correctly, then the UL assembly you''ve selected won''t work because it is only listed for an interior exposure, and the requirement is for an assembly rated for exposure on both sides.


   

Re: Number for UL rating By  Powderhound

Posts: 0

5/24/2009 7:23:00 PM

This should not be this difficult. This is a situation occurs often. Why wouldn''t UL have a rating for this type of wall assembly; for both interior and exterior exposure.


   

Re: Number for UL rating By  jdrobysh

Posts: 0

5/26/2009 5:16:00 AM

Ph -

Keep looking, there are assemblies rated from both sides. You just haven''t found one yet.


   

Re: Number for UL rating By  Powderhound

Posts: 0

5/26/2009 3:33:00 PM

I got a response from UL for the wall assembly No. U356 and this will not work for an exterior application. UL informed me that they do not have a wall assembly for using stucco on the exterior, over wood structural panels over wood studs.

Now I''m very confused, any suggestions on test result from other agencies or company''s indicating this type of wall assembly. In my area for many years this has been common practice for a one hour exterior wall assembly.


   

Re: Number for UL rating By  jdrobysh

Posts: 0

5/26/2009 3:54:00 PM

Ph -

Try the HUD Guide to Archaic Assemblies. Should be in the Referenced Standards.

The masonry people may have something.


   

Re: Number for UL rating By  RLGA

Posts: 0

5/26/2009 7:59:00 PM

Surprisingly, the IRC doesn''t define how a fire-resistance-rated wall is determined like the IBC does in Section 703.2. ASTM E 119 is only mentioned three times in the IRC: for thermal barriers, through penetrations, and separation between units in two-family dwellings.

I suggest using the calculated method of Section 721 of the IBC. Since it is an acceptable method for projects under the IBC, I can not see how its use would not be permitted in your case, even though it is from a different code.


   

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2015 I-Codes