How do I use a damp proof membrane under self levelling compound in a garage?

williamgriffin

Kinkajou said:

Thanks, Gastines3, FreeBear, and gwynlas!  Well, I called a damp proofing guy in, he had a look said if it was him he would put in a screed at least 2 inches high and concrete outside.  Said he'd provide a quote but didn't come back to me.  So, as money's too tight to mention round here, I replaced the leaking door with a cheap UPVc one. Freebear, you're right, some of the water was blown from the old door that couldn't close.  I mixed some concrete, removed the moss, and built up around the side of the garage at the outside with the concrete, and filled in some deep holes.  Inside I put flashing around the walls also laid my first self leveled floor using Setcrete Deep Base.  Not bad for an amateur, it rained a few times & garage stayed dry- happy days. BUT - last night's torrential rain shows there are still some leaks, it seemed to seep through from the outside and over the top of the flashing onto the floor inside. Very frustrating!. But not half as bad as it was previously.  There is a huge puddle outside on the road corresponding to where it's coming from, so on the next couple of dry days, I'll be outside again with more concrete.🙄. Just wanted to update. Thanks if you've read this far!😀

Is there any method to this madness or are you making it up as you go along?

Kinkajou

williamgriffin said:

Is there any method to this madness or are you making it up as you go along?

Hi williamgriffin,
I did state that I am an amateur on a limited budget. So, yes, making it up as I go along. Hence my posting on moneysavingexpert.  I've taken steps to make my shabby garage look better and be more functional. So far it looks miles better than before with a smooth non-dusty concrete floor, clutter-free, and painted walls.  
Thank you for your comment that my efforts are madness. Not a very constructive comment and - if it was intended to make me feel bad, then you've succeeded. 

Kinkajou

531063 said:

If you spread talc powder on the floor you will see if water is running in through a trail in talc, give you idea of which direction to look in

Thank you for your help. I was in there when it was raining and could see where the water ingress was. The talc is a good idea.😀