My Garage, Repair Or Replace

sheds need ventilation, or else they sweat bad.
you need a good dehumid' as before. you had no where else for bikes, so improve what you have.
If it was mine, i would remove the roof and lay on rigid insulation boards, lay on marine ply and through fix into rafters.
Then glue a rubber membrane over the top, one side at a time.
To the walls, I would vapor control/felt all round, overlapping horizontal joints. Then fix 50x25 treated laths through the felt, into the vertical members that exist, then reclad the shed with horizontal treated shiplap.
Then fit gutters, inside, fit insulation boards between vertical timbers, and overcad with 12mm ply if required.
The doors could do with the same treatment.
If you use cedar classing for the outside, you wont need to look after it. Its full of natural oils and resins.
The rubber roof will last 50 years, and requires no real skills to lay.
Did I say you need a big dehumidifier? :Woot: 2p an hour to run (will only run occasionally if its well insulated).

with regard to the slab, its fine, ideally, your cladding/laths want to run down below the top edge of it, ie so water cant run across slab. (sorry, floor slab).
eitherway, nothing should touch the soil or ground (concrete apart).

Now, If you really want to go to town, lay some visqueen on your floor, dress it 100mm up your walls.
Lay 50x50mm laths on the floor, 450mm apart then lay 450mm wide insulation, 45mm thick between.
Counter lay 22mm chip board flooring on top, and screw and glue this to the 50mm laths.

Floor paint, or lay lino over the wood.

It will be warmer than your house, and a small heater will see it toasty warm for those tinkering cold evenings.

 

Just roll on some decent felt

 

18mm minimum for a shed roof.
9mm has way too much movement.

 

Dont bother with replacing, repairing or treating the wood.
It's a natural product it fixes itself... Pmsl

 

I repeat, it's a shed.

 

cant remember what its called goggle steel roof products, not expensive.you probably could put it on boards underneath, i didn't comes cut to length screw it on to joists easy peasy, trust me i am no builder. yip it's noisy, but not half as noisy as me if i find the bike sitting in a pool of water.

 

Man cave...retreat from women folk?

 

OT - May want to watch that. Mate lost his bikes (tools, lawn mower etc) from his shed that he declared a garage when he was on holiday. Mr Insurance refused to pay once the assessor visited.

 

Happy days. Good luck with the rebuild.

 

The dependant factor is the spacing of the rafters on a pitched roof and whatever the final surface is, plus the snow load.

If the roof is tiled/slated, then the plywood really does nothing other than support the moisture barrier and adds to the security........9mm ply isn't easy to get through.

I agree if it was for a flat roof and potential snow load, but again dependant on the roof joist spacing.

Of course, any plywood sheathing adds to strength, by preventing the structure from going out of square. It can actually mean that diagonal bracing between studs (and rafters) isn't necessary.

 

Why not just build something solid?

 

Too wide for felting on 9mm; probably too wide for tiling.........just about OK if using fake slate if the batten size is 50mm x 40mm minimum (and 9mm ply).

If felting, unless you add some intermediate rafters and ceiling ties, you will need 18mm ply, as ACT said.

 

I didn't 'start again' because I wanted the building in the same place as the existing one, so I had to add to the existing one and then strip and revise it to suit the new bit.