The walls have since been insulated and drywalled. But the floor is the same; plywood!
How to insulate my plywood shed floor?




I'm turning my 130 square foot tool shed into a small livable room and the floor is plywood on floor joists. It is on a hill, so the back is very close to the ground (too low to get under to insulate from the outside). I'd love some suggestions on how to insulate the floor from the inside. I have about 4 inches before the door won't close! Thanks to all ideas.
Best,
Magi


This pic shows the pitch of the yard under the shed. Even the front is only about 12 inches, then it gets lower from there back.


Related Discussions
Vinyl plank flooring vs pergo (laminate)

I currently have stinky dirty carpeting in my living room and I want to replace it with a durable flooring that can stand up to dogs and kids.
How to remove popcorn ceiling that has been painted?

Does having a paint over a popcorn ceiling change how I'd remove the popcorn ceiling?
Vinyl plank wood-look floor versus engineered hardwood

We are building a new home and trying to decide between engineered hardwood or vinyl plank wood-look flooring. We have two kids and are wanting durability but want it... See more
What is under there?!

Can someone tell me what to expect and prepare and tell me just to go for it!? So we bought our first "new" house and from the deed I found in the creepy basement I k... See more
Transitioning hardwood floor to tile floor-is there a better way?

We recently installed hardwood floors. The installers used a wide trim between rooms. I think it cheapens the look of the hardwood. Is there another, better looking ... See more
Flooring choices for mobile home

Have a 30 year old mobile home that we will keep for 2-3 more years before selling. Not sure I want to invest $5-6,000 for laminate throughout. What about vinyl in la... See more
Looking for discontinued laminate flooring. Wilsonart American Oak

Wilsonart American Oak Standards Classics W3000029. I could use enough to do a 9 x 12 room. Thanks
It’s difficult to imagine without a photo but simply using a wall to wall carpet (I’d use indoor/outdoor) would provide some insulation. The key is to use very good padding, even a double layer (one solid, one more open weave) of padding would provide a decent insulation. I’m curious though, could you not use a spray foam insulation on the exterior under the floor? Or even take up the plywood, lay insulation and put the plywood back in place.
There are insulation panels that you can buy. They are about an inch thick, but I don’t know what the ‘R’ value would be. Additionally, you would need to put another floor over the top of the insulation. Another possibility would be to pull up the plywood flooring and put in regular batt insulation. Since you are dealing with a small space the job wouldn’t be too bad.
Hi Magi, You can remove the plywood and use standard floor insulation batts. If this isn't an option, you can make a small hole in the plywood between the floor joists and use slow expanding spray foam. The foam expands to fill the space and there are many DIY kits and instructional videos on how to do this.
If you've got 4" of height clearance, I would consider creating another floor on top of the existing one. You can purchase foamboard insulation panels to insulate. 2" foamboard has an R10 insulating value. 1 1/2" foamboard is R7.5. The advantage of foamboard is that if you cut it to fit as tightly as you can, you can caulk it and it becomes it's own vapour barrier also. It is also impervious to moisture. Cheers.
Hi! We just did this to a deck turned sunroom. I’ll try to explain this the best I can.
We removed all the top decking boards.
The we rigged 4X8 treated plywood from the top and underneath, I went under and screwed the plywood into the floor joists. (2X8’s)
the I ran 1X1 strips the circumference of each opening and used caulk and screws.
Then I used block batting and laid it each cavity.
Then we put 3/4 untreated plywood down as a subfloor.
If this doesn’t make sense, I’ll help you in more detail if you need me to.
o will say this, it is not complicated but some steps are a two person job.