Shed floor rotted
- Thread starter Jsf721
- Start date
jkeyser14
Well-known member
You'll pretty much only find 3/4" marine plywood at most home improvement stores.
mike93lx
ALLIANCE MEMBER
My local HD carries 15/32 and 23/32. I'd do the thicker and make sure to run fasteners rated for PT.
How wet is it under the sheathing? Getting some airflow will help
Shiftless
Well-known member
You'll need 6 sheets, right? That will run you over $400 right?
You could have a concrete floor if you poured a bit over one cubic yard of mud.
Think about it…
You could have a concrete floor if you poured a bit over one cubic yard of mud.
Think about it…
How to get air flow ?
mike93lx
ALLIANCE MEMBER
Pics of the shed would help.
Is the framing sitting on the ground?
Whats causing the floor to rot?
mike93lx
ALLIANCE MEMBER
6 sheets for a 9x13? 4 will do it, at $55ish each. Add one if you want larger pieces and more waste is ok
Shiftless
Well-known member
You might be right depending on how the framing underneath is run. You’re definatley right about there being significant waste no mater what. PT plywood here costs more than $55
I’m not home but found these on my phone.
The shed was built on a stone gravel base.
The floor lasted 3-4 years. It’s regular plywood
. I did not know what to look for when it was built and a plastic tile covered it.
mike93lx
ALLIANCE MEMBER
For airflow, you'd have to lift the whole thing up and get it up on blocks. If I was doing that work, I'd be pouring a floor and placing it back down on it.
Even getting the new ply under the walls will be a challenge
Even getting the new ply under the walls will be a challenge
its got electric going to it so i am not sure how jacking it up would go?
mike93lx
ALLIANCE MEMBER
Disconnect it and then extend the wiring with a junction box.
I think slapping plywood down is a bandaid, at best
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Bunsen Honeydew
Well-known member
Oof. If appears to be set directly on shaded damp ground, with no air circulation underneath. That is trapping dampness underneath. There is always moisture in the earth. Regular plywood does not deal well with dampness. Then, you have additionally trapped that moisture in the wood with your floor mats so it can never dry out.
I'd be very surprised if your floor and lower wall framing was not rotting also.
Oh, that wood decking outside is not helping the cause, either. It has to be directing/trapping rain water under your shed also.
I'd be very surprised if your floor and lower wall framing was not rotting also.
Oh, that wood decking outside is not helping the cause, either. It has to be directing/trapping rain water under your shed also.
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Probably easy enough to cut the wire inside the shed near where it enters the shed, Jack it up, install the 4 x 6s and then install a junction box inside the shed where a reconnection could be made.
My Harbor Freight floor Jack has been known to lift more things than cars.
Bunsen Honeydew
Well-known member
Looking closer, I'd be willing to guess that your floor is, even worse, osb rather than plywood -- not that either would have a chance of survival with that construction.
Fav Onefour
Well-known member
Looks like significant rotting in the door framing already.
I'm still trying to figure out why the door was mounted with that orientation? I cant tell if the accelerated rotting is from ground contact or the backward mounting.
I'm going to take a stab, is that shed also insulated?
Honestly, you have two optional routes for repair. Go with the shortcut and slap another floor inside. You might get another few years before the shed really starts to fail. Save money and do simple exterior ply if you go that route.
If you want the shed to last, tear out some interior OSB to see what you have before doing anything else. After taking a look at the lower walls, come back with pictures. It's not fair to give advice without knowing some of the details about the walls and level of rotting.
Thanks for the replys. You guys gave me great ideas. I will unload the shed this weekend and explare the damage and the feasibility of the other suggested options. Jacking it p and getting it off the ground, Concrete pour and decking.
Thanks for the excellent suggestions, and not just answering my question that just showed my lack of knowledge on the subject !
Thanks for the excellent suggestions, and not just answering my question that just showed my lack of knowledge on the subject
!The downside with concrete pad is from your pic it looks like that spot is damp pretty regularely. That can lead to the slab holding moisture and higher humidity inside the shed. Having it elevated with air flow underneath it is the equal solution. In either case you'd probably also want to some how elevate the ground it's on also so that you can slope away from it to keep any sitting water and dampness to a minimum.
theoldwizard1
Well-known member
The "marine" plywood sold at most "big box" stores is a scam ! Real BS1088 is INCREDIBLY EXPENSIVE ! It uses exotic hardwood plies and "weather and boil proof" glue. The plies are thinner so there are more of them, which actually means you can use thinner plywood.
Also, all real marine grade plywood is sold in metric thicknesses.
Shed floor. Just use 3/4" PT plywood.
theoldwizard1
Well-known member
If there is light and air movement underneath, you probably will NOT get a varmint making a home there !
65ranchero
Well-known member
I had a shed at my other house that my buddy and I installed. Shed was pretty much on the ground with PT 4x4 buried halfway into the ground to get it level.
Talked me into " marine ply" for the floor, the whole thing rotted out in a few years.
Next shed was on a gravel base with a preassembled structure trucked to the site sitting on 4x4 above ground.
There to this day
Talked me into " marine ply" for the floor, the whole thing rotted out in a few years.
Next shed was on a gravel base with a preassembled structure trucked to the site sitting on 4x4 above ground.
There to this day
couch67
Well-known member
heres what I did to my old shed. Lifted, and put a new floor in. Extra height for air movement, and mesh to keep varmints out.
www.garagejournal.com
My Seasonal Shed Restoration
The Yellow Shed Revival Its been a year since I put up a new 12x16 storage shed, and it has really come in handy. Also on the list was to do something with the original shed on the property. Its 8x12, standard framing, with a wood floor. It was an old shed when we moved here 22 years ago, so...
www.garagejournal.com
Lorydr
Well-known member
The shed that came with my property has 3 different levels of floor due to rot and such. The walls...well whoever built it was only counting on half of the screws to land on a stud. Someday it will be replaced.