??

Can't think of anything easier for DIYer.

Adjust the floor framing size to fit overall dimensions; remember to consider joist spacing.

or... don't alter the dimension, inset the decking and place the sill plate as normally located.

 

Hi all.

I'm going to be building a 12x16 storage shed. I was planning on using T&G plywood for the floor, but realized it's actual size is approximately 47 1/2 x 95 7/8. (It varies from brand to brand.) If the framing for the floor is a full 12x16, then the 3 sheets of plywood are not going to cover the entire 12' width.

I know non T&G plywood requires spacing, but I didn't think the T&G did? 🤷‍♂️

When you are building a 12 by 16" that is the size after the sheeting is on the walls so the floor is 11'11" by 15'11"
So the plywood comes up 1/2" short under a wall, I will not tell anyone. It happens all the time.
Code says to have a gap between the but joins so 2 sheets make 16 ft so they will be 2 long for the 15' 11" floor.

 

You will need to leave some gap for expansion in the summer heat. For tongue and groove you would not press the joints together all that tightly.

This will take up some of the slack that would otherwise result in a gap under the exterior edge all the way around the perimeter and covered by the wall sole plate.

 

...realized it's actual size is approximately 47 1/2 x 95 7/8.

I've never seen a "4x8" sheet of anything that was 47 1/2" wide. T&G ply and OSB around here is about 47 7/8", not including the tongue.

Anyway, if that's really what's available to you, the simple solution is just reduce the width to 11' - 10 1/2" (out to out of the framing).

 

I've never seen a "4x8" sheet of anything that was 47 1/2" wide. T&G ply and OSB around here is about 47 7/8", not including the tongue.

Anyway, if that's really what's available to you, the simple solution is just reduce the width to 11' - 10 1/2" (out to out of the framing).

Advantech is 48 plus the tongue. Most plywood is 48" before the tongue is cut so 47 1/2 is the normal.

 

Well, color me surprised! I just looked, and the T&G OSB sold locally here is indeed only 47 1/2" wide, not including the tongue.

I guess you should think about reducing your width by an inch and a half.

 

The floor should always be smaller so the building is the correct size with the sheeting on it.

 

Thanks for the responses. I checked some different ones online and there are some that are just an 1/8" short. I was planning on getting my lumber from a local yard. I'll see what they have available. I agree a half inch just seems way too short.

I don't want to adjust things too much as I'm working from "plans" that has measurements for all the cuts. Not a big deal if I can remember to make the adjustments everywhere needed.

 

checked some different ones online and there are some that are just an 1/8" short.

Be careful with that; they may be including the tongue in those measurements.

 

Be aware that untreated T&G plywood will have a very limited life since it is sitting over earth. Same goes for your floor joists. Much better to use treated plywood, or use treated 5/4 x 6 decking, so the floor won't rot out in 2 or 3 years. If you are determined to use untreated wood, at least use a 6-mil visqueen vapor barrier on the earth.

 

Hi all.

I'm going to be building a 12x16 storage shed. I was planning on using T&G plywood for the floor, but realized it's actual size is approximately 47 1/2 x 95 7/8. (It varies from brand to brand.) If the framing for the floor is a full 12x16, then the 3 sheets of plywood are not going to cover the entire 12' width.

I know non T&G plywood requires spacing, but I didn't think the T&G did? 🤷‍♂️

I always use pressure treated plywood for shed floors.

 

I was planning on using this. Or whatever equivalent the lumber yard has.

https://www.lowes.com/pd/AdvanTech-Flooring-23-32-CAT-PS2-10-Tongue-and-Groove-OSB-Subfloor-Application-as-4-x-8/50126556

Is that sufficient?

 

I was always planning to use ground contact PT wood for the 6x6s and the floor frame/joists. Now, I'll be sure to use PT plywood for the floor as well.

Thanks for everyone's help and suggestions. I want this to be a solid shed that will last a long time.

I'm sure I'll have some more questions as I get ready to start building.

Thanks again.

 

Move up to 3/4" plywood as it won't have tongue and groove and with less the 3/4 you would have to put blocking under the join just to replace the T&G