FRTW plywood needed or not?

[syarn]

https://picasaweb.google.com/svyarnall/PlywoodInBathroomWallTypeIIB?feat=directlink

is the plywood shown in the weblink above have to be FRTW or not?

it is the proposed substrate backing for wainscot wall tile in a bathroom of a type IIB, assembly A-2 restaurant, 2393 sf, single story, no sprinklers.

 

[RLGA]

Why are they using Type IIB construction for a 2,393 sf building?

 

[syarn]

rlga

pardon me.

this is a change of use tenant space alteration in a strip shopping center existing shell.

during prelim code check estimated the overall existing shell bldg to be 17,115 sf.

bldg is here:

http://maps.google.com/maps?q=40.055861,-76.39973&num=1&t=h&sll=40.05289,-76.396797&sspn=0.006295,0.006295&hl=en&ie=UTF8&ll=40.055689,-76.398325&spn=0.006882,0.013036&z=17

@ the green arrow....near the red A icon.

 

[RLGA]

Okay, makes sense. I assume the A-2 is separated from the rest of the structure by fire barriers in accordance with Chapter 5; otherwise, a sprinkler system would be required.

But, to get to your specific point, I would state that FRTW plywood would be required per Item #1.1 of Section 603.1 (2006 IBC)

 

[syarn]

yes the old blockbuster space is being sub-divided with a new fire barrier into a five guys & saladworks restaurants.

thx u.

 

[RLGA]

Just to add, as a construction specifier, I would never suggest to my clients using plywood as a substrate for ceramic tile in a commercial setting--I believe it will perform worse than water-resistant gypsum board. Besides, I don't think it complies with Section 2509.2 as a base for tile in toilet compartments, anyway.

 

[Gene Boecker]

I have to agree with Ron about the substrate. They'll probably need plywood or some type of blocking for the grab bars in the accessible stall but Section 1210.2 would stop the usage of plywood unless the mortar has a waterproof sealer integral to it. The joints are NOT nonabsorbent unless treated. The mortar will eventually wick moisture back to the substrate.

 

[syarn]

gene

thx.

10-4.

good news is the markings from the photo are suppose to be FRTW stamp.....

 

[peach]

FRTW is one thing.. required for concealed blocking.. well and backing; but why would you have wood as a backing for ceramic tile.. should be dur-rock or equivalent. FRT wood still is no good for moisture.

 

[Gene Boecker]

Peach, you are so right!

Even if the hair stylist is numb from the waist down, they still check the temperature with their hands before starting (unless of course the customer is a complete jerk, in which case the water is ice cold).

Full disclosure: my wife is a stylist. She used to own a salon on Sanibel before we moved back up north.

 

[syarn]

peach

yes the moisture issue per 2509.2 was brought to GC's attention...thx u.