Garden Shed Floor Replacement

The floor in my shed is starting to rot. It’s a basic B&Q 6’ x 4’ with chipboard flooring. It sits on a concrete plinth.
Any ideas on the best way to replace it? Do I need to dismantle the shed? Thinking of replacing it with decking boards.

 

Is this the one, supplied with the floor bearers fixed (nailed?) to the underside of the floor, spanning between the 2 long sides, with the bottom members of the side panel framing sitting on the edge of the floor all around the perimeter and screwed through it into the bearers underneath?

 

@Scrungee, spot on. That’s the exact shed I have

 

So where is it rotting, Isolated areas or around the perimeter, and have the bearers uderneath and the framing sitting on it also started to rot, maybe even the bottom shiplap boards?

 

It’s rotting in two of the corners, also the bottom boards are showing signs. The framing it sits on looks fine, but I wouldn’t be surprised if the bearers were rotting also.

 

If you dismantle it for repairs now, you would probably lose the 2 roof boards when trying to remove unless you can get at all the nail heads, and you'd need to re-felt at the worst time of year (wet and cold).

I'd try repairing the corners, if a bottom board is being replaced that should enable a new piece of flooring to be slid into place from the outside after cutting out rotten board together with any fixing down screws passing through it and outer (rotten) bottom board.

It doesn't have to be removed all the way up to a bearer, simply slip a new piece of bearer halfway under the cut edge to support the existing floor and new infill piece. Then fix new outer board and replace any low level framing rotten/damaged during repair work and screw down to bearers.

Does that sound doable? @ricky101 is very practical and might well have a better solution.

 

Thanks for the response. If it stops raining here I’ll have a go at a temporary repair. My plan was to do it when the weather improved, probably spring. So I may do temporary to keep the weather out now and go for full dismantle in the spring. I want to beef the bearers and floor up anyway as it’s quite flimsy and I have a lot of stuff stored.

 

Um, Why do you have a wood floor if there's a perfectly good concrete pad there? Don't need two floors!

 

Good question . Probably because the shed came with the floor and I didn’t think
Would I need to secure the shed to the concrete plinth?

 

I'd stick with a wooden floor raised up above the concrete.
If you dont the shed floor will be peramantley damp or wet during wet weather.

Best if you make a new floor from treated timber bearers then screw your decking to it in the opposite direction.

If you measure it correctly and make it in advance I would think with a small shed like that you could probably just jack it up on blocks or bricks and slide the new floor under.
Might be a bit of a fiddle but worth the effort.

 

Another thought - If you're dismantling anyway, maybe build a new shed (using the old parts as well) to the perimeter of the concrete base? Bigger shed, already have the base...

 

Thanks @Loofah and @pete. I’m not sure my woodworking skills are up to making a shed. Although looking at the construction of the shed it doesn’t look complicated. I think I’m leaning toward jacking the shed up and replacing the floor that way. I think I need to leave it to when we have some better weather. That way I can get everything out of the shed and leave it out until finished.

 

I know how you feel - I have to build a new one and just want some warmer drier weather!