Shed "reconstruction"

EDit

Hi all...looking for advice as there seems to differing opinions online.

The issue is that we have a shed in garden constructed from breeze blocks on a concrete floor and with a single sloped roof of corrugated plastic. Over the winter, we had terrible issues with condensation (it was effectively raining inside the shed) and lots of items were ruined by mould.

Looking online there seems to be a variety of options available but I don't know if I need to do all of them or if any are unnecessary, as follows:

1) increase ventilation by putting in air vents in walls (there are not vents at present) --> so the warmer air inside can get out

2) put some sort of insulation on the underside of roof --> so the underside of the roof is not cold and condensation will not form

3) take the walls down and construct a timber floor with vents underneath and then reconstruct the walls and roof --> apparently if you have no DPC (which we don't) the floor can be the main source of moisture and this cuts that off

Obviously, options 1 and 2 represent a significantly smaller job than if we need to do option 3 as well. So just wondered what people think of these options or if anyone has any other suggestions (and I want this done properly vs necessarily cheaper as its a false economy if we cut corners and end up with ruined items in shed every winter)

Thanks in advance

Calahonda52

is there a doc in the walls?
what do you mean by breeze blocks
If so then you can lay 1000 gauge plastic or radon barrier on the floor, with plenty overlap and joints taped and then pour a new concrete floor, lapping the dpc up the walls to beyond the wall dpc and taking care at corners, don't cut it, fold it as best u can
Ventilation is important and even more so as whats happening is that the sun is heating the shed through the plastic and warm air contains a lot more moisture
http://www.dpcalc.org
and then when it cools at night it condenses back out
put vents back and front so to aid ventilation, perhaps if u have elec there fit a bathroom fan with a humidity trigger on it



Insulating the plastic from underneath is not the way to go

EDit

Thanks for reply

Blocks used for build were pretty much like this http://www.online-building-supplies.co.uk/100mm-7n-solid-dense-concrete-breeze-block-42-p.asp
(Note that I did not build it, so I am going by what I can recall them using...size might have been different, but they were solid rather than having the hole in them)

Not sure what you mean by "doc" (excuse ignorance)

EDit

Ok maybe that was an autocorrect thing and you meant "is there DPC in the walls". If so, then I think not.

I should also mention that the back wall is part of a longer garden wall and one side wall is part of a boundary wall on which my neighbours shed is built off (his shed has been there since we bought this house over 10 years ago) I could ask him about whether his wall has DPC, but pretty sure that rest don't have it. Anyway, point is that we cannot actually take down all 4 walls...we could take down 2.

Thanks