Wet Shed!

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16 Dec 2021
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Hopefully the right place for this?! Recently purchased a property with a medley of sheds, summerhouses and greenhouses on it!

The shed our sellers romantically described as “the gym” is better described as a swimming pool. Source of the problem seems to be the DPM which was apparently put down by someone who clearly wasn't thinking about what they were doing! It does little more than more expedite the rate at which water gets into the shed. See the photos for the issue.

Short of taking down the shed and then putting it back up again, what ideas does anyone have to get the shed water tight.

Here’s the idea’s I’ve toyed with so far--- to my mind getting less feasible the further down the list.

-Tear out the floor (most of the plywood floor has disintegrated anyway) and remove the bearers/joists (which are incidentally still in surprisingly good order). Put down a new DPM and either try and feed that up the internal or external wall. Them dump a whole load of concrete on top.
-Same as above but try to re-fit the joists instead of a concrete floor.
-Somehow Tank the exterior of the shed? – not sure how feasible this is or the longevity of this.
-Somehow lift/wedge the shed and feed a new larger BDM underneath… keeping in mind its it’s a hefty beast!

I’m sure there must be a better way so throwing it out to the more practical minded folk out there. (sorry about the photos, rarely home during the daylight hours this time of year).


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is that the flooring visible on the outside or the timber its on ??
 
Use a car jack and lift the shed if you can onto concrete blocks at a reasonable span pattern.

Raising the floor onto stool supports will reduce the ground contact whilst also allowing air to flow freely under it.

Then just wop on some 18mm osb and you are back in business.
 
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as blueloo say off the ground by at least an inch for airflow and water off the roof kept away from the base off the shed
as a temporary measure, a bit off thick roofing felt tucked into the groove underneath/behind the txg shiplap cladding at a 45% angle will stop water that falls down getting underneath and throw away any rain running down the outer face
 
Thanks for the wisdom, some good ideas. Going to try and jack the blighter up and get it off the ground and go from there. some good tips on youtube as to getting this lifted without too much risk of damage. Will see how I get on in the spring!
 
Thanks for the wisdom on here & youtube. With the aid of some wedges and a car jack managed to get the shed off the ground and fed some of those plastic grids (ecogrids) underneath, just in the nick of time given the state of some of the timbers! Seems to be drying out nicely ready for a new floor.
Cheers.
 

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