T1-11 as small subfloor?

[BetterDays]

Due to a patio project that did not include a step, I am now going to build a small raised platform inside of the garage. I am planning to frame 16" OC since this will be between two doors (one to the outside, one to the house).

I have extra T1-11 that I am thinking of doubling up to use as the subfloor and then will cover it with indoor/outdoor carpet

I think it will be strong enough (especially doubled up), but wanted to see if anyone here has done or has feedback.

Why would I do this?
I have it in the shed and no other plywood
No truck to get plywood.

Thanks in advance!

Sent from my Pixel 3 using The Garage Journal mobile app

 

[NUTTSGT]

Not sure I would us it with the grooves in it Kevin. I would thing it would create a weak spot. What's the thickness ?

 

[BetterDays]

Not sure on thickness. Pretty thin, hence the doubling. Was used as siding on the shed build

Was thinking the back side is smooth...

Either way, groove issue would be minimal due to carpeting over it.

Sent from my Pixel 3 using The Garage Journal mobile app

 

[metlmunchr]

T1-11 is 5/8 thick so as long as you run the grooves perpendicular to the joists, then even a single thickness should be pretty stiff. Doubling it should make it very solid.

 

[BetterDays]

I think mine is less than 1/2", so maybe 3/8"?

Sent from my Pixel 3 using The Garage Journal mobile app

 

[bad_idea]

I would buy a sheet of plywood. The box stores will cut it down for a small fee.

 

[lakeroadster]

T1-11 is 5/8 thick so as long as you run the grooves perpendicular to the joists, then even a single thickness should be pretty stiff. Doubling it should make it very solid.

T1-11 comes in various thicknesses. I used 3/8" in our shop.

 

[NUTTSGT]

If it's 3/8" thick and OSB, it's probably the E-Z panel stuff and not true T1-11.

 

[tarmy]

My stuff is 5/8...

OP...glue and screw it to the framing...doubled like you said...should be plenty strong.

 

[The Cobbler]

it will be fine I'm sure. stagger the groves so they're not on top of each other . glue them together , even use 3 layers.

 

[lakeroadster]

If it's 3/8" thick and OSB, it's probably the E-Z panel stuff and not true T1-11.

True T1-11:

T1-11 plywood sheets are available in 48-by-96-inch or 48-by-120-inch sheets. Sheet thickness is either 3/8, 5/8 or 3/4 inch.

https://www.hunker.com/13402009/t1-11-plywood-specifications​

But you bring up a good point. If the OP has the EZ-Panel stuff, which is more like OSB than Plywood, I sure wouldn't use it for flooring an outdoor shed.

 

[BetterDays]

Thanks everyone! I appreciate the feedback

Sent from my Pixel 3 using The Garage Journal mobile app