1 x 4 or 5 between joists as subfloor

[pitterpat]

Hey guys, Happy Holidays,

Have any of you guys seen a subfloor which is 1" x 4" or 5" between the joists? Below is a pic, it is my neighbor's subfloor. It is a bathroom and we have to have it finished by Monday. There was old-style tile in this bathroom, old-style meaning mud set with lathe, just like mine was.

I told him to use 3/4" plywood and to set the plywood with the grain running perpendicular to the 1 x 5's. And since we're using Ditra over the top of the of the plywood he could screw into the joists, from this JB thread from 2009. http://www.johnbridge.com/vbulletin/...p/t-71384.html

He will have plenty of height for tile because at the doorway is a 3/4 - 7/8" subfloor board going into the bedroom with the finished floor in the bedroom of about 3/4 inch.
First time I'm ever seen not having squeeze to make the the bathroom floor match the bedroom.....usually have to figure out how not to make the bathroom floor higher than the adjacent room.

I guess I'm just checking here to feel confident about what I told him and the funky subfloor there. Thanks!

[tilemanct]

You could have mudded it quicker than going the plywood route. You could have set the height wherever you needed it to be. That floor was a "gift" to a tile setter!!

[pitterpat]

Originally Posted by tilemanct

You could have mudded it quicker than going the plywood route. You could have set the height wherever you needed it to be. That floor was a "gift" to a tile setter!!

I'd still be mudding and it is close to zero here in Indy.


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[Tool Guy - Kg]

Hi, Pat! Merry Christmas and Happy New Year!

I see a fair number of floors like that in Southeastern Wisconsin that were installed to support a layer of mud. Your plan to run 3/4” perpendicular to the joists is perfectly fine. I’d plan the plywood configuration ahead of time to minimize any extra seams.

[Davy]

Nothing funky about it, just the way it was done back then. Hopefully none of the 1x6's are higher than the joists. I would lay a straight edge across the tops of the joists to see if they are inline. I know it can be tough mudding anything in the cold but one of the good things about mud is that it doesn't follow the framing. Your plywood will follow the framing so I'd check it first.

Yep, run the plywood perpendicular to the joists, not the 1x6's.