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robgraham robgraham is offline
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Default Membrane for shed floor?

On 28 Nov, 19:22, Broadback wrote:
Harry Bloomfield wrote:
Broadback wrote :
Is it worthwhile installing a damp proof membrane when I build a
concrete base for a metal shed? The concrete base will be the actual
shed floor.


I would suggest yes, but you also need to consider how you intend
shedding the rain which might run down the outside walls and then track
into the shed along the concrete base.


Thanks for all the tips, a membrane it is then. The manufacturers
recommend sealing the base to shed with mastic to stop ingress of water
from the outside walls. Also the base will be about 10cm longer and
wider than the shed, I will also have gravel around the base as a way of
draining the water. It will be used mainly for storing garden machinery.


I've always avoided this problem by building a dense concrete block
wall a block or two high, pouring the concrete inside it (with dpm)
and then sitting the shed on the wall with a dpm and suitable drip
arrangements. A bit more work but it avoids the problems the OP is
finding and gives a floor that is guaranteed to be dry. It also saves
me the hassle of trying to arrange shuttering for the concrete pad.

Rob