liquid dpm coverage? advice please

JayHS · 1 Jan 2013

Hi there.

looking at using liquid dpm, and trying to work out what coverage one would get from a concrete base, looking on the www i found this info below

"DryBase Liquid-Applied DPM (previously known as DryBase Vapour Membrane)

Package Content:

■1 X 5 litre container if Dry Base

Coverage: Each 5 litre pack will cover up to 4.5m2 depending on the substrate surface texture. "

is this right, as I would have thought a 5ltr would cover a far larger area. or does this go on like thick paint? or just how thin a coat can be put down.

some vids i have seen looks like water they are rollerin on the floor. sorry for a silly question! just trying to get a better understanding for the ammount i will need to buy.

total area i am doing is 60m2

dazlight · 1 Jan 2013

Is the concrete old or new?
Does it have a damp proof membrane under it?
Is it rough or smooth?
What is floor covering going down?

nickjb · 2 Jan 2013

The stuff I used went on very thick. It made a sort of rubber layer. 4.5m2 for 5l would be 1mm thick which sounds about right. It was proper waterproof afterwards, I used it to line some wooden planters. What are you trying to achieve? There might be a better product/option.

JayHS · 2 Jan 2013

Hey Guys n Gals.. ( do any Gals post on here? ) just a thought

anyways

Daz, Hi bud! the conservatory is now 12 months old.. with DPM sheeting, and the floor is bone dry. other than the odd wet footprint from the outside wet

the older areas I have no idea.. (other than original 1947- 55) hence asking about the Liq dpm, better to be safe than sorry

not sure yet as to the surface finish? as it has laminate over the old orginal house footprint, but i thiink it is smooth.. with a number of chanels n groves for CH pipework in the past and cemented over again.. and i recon it will be very poor surface in general.. but who knows

I am looking at fitting my Amtico flooring, i shall be helping.. but i am getting an expert in to do the work

but the idea is this, as far as i can work out as I have not yet spoken to my mate Steve and what we would need, or what he needs as it were

but this is the plan

Old n New concrete = liquid dpm it all
screed over with self level slopppp - 3mm - 18mm
Amtico PH and HT floor adhiseive in the appropriate areas
then lay the vinyl then simply roll my kids all over the floor to help the floor vinyl stick, and hope the kids don't get stuck to the floor

JayHS · 2 Jan 2013

oh but thanks guys..

you have answered me question relating to how thick a liquid dpm should or might be.
the uTub vids were very misleading

i will read the instructions on the bottle or brand when i get some and follow that.
but its always nice to have answers

dazlight · 2 Jan 2013

Jay some dpm's can't go over floors with no existing dpm. Best to check before you buy some.

JayHS · 2 Jan 2013

oh ok.. hey dude

i just thought, when i said ( or typed, as it were ) the new conservatory has dpm!! ( one huge dpm sheet of black plastic ) it is some 75mm under the polystyrene insulation that is under some 30 - 70mm of cement on top of that? which makes the final finished surface of the current floor.

Just wondering if that makes any difference

dazlight · 2 Jan 2013

[quote
the older areas I have no idea.. (other than original 1947- 55) hence asking about the Liq dpm, better to be safe than :[/quote]

Here mate if the older floor is before 1965 chanes are no dpm.

JayHS · 2 Jan 2013

hey dude

yes i know i was going to us a liquid dpm for the older part of the house

but what about the new area conservatory with the dpm 100mm below the surface of the floor?

should i just treat it all as "No dpm" and cover the entire floor as such with a liquid dpm then.

dazlight · 2 Jan 2013

On that side I'd use laybond rapid dpm which is water based and cheaper. It does 40m2 2 coats and dries in a hour.

JayHS · 2 Jan 2013

Seet

ok cheers i will look into getting some.
just got off the phone from my mate who is looking at doing the work.
wont do it till the cold n wet weather is passed, so a couple of months i guess
plenty of time to look around for some great deals on ebay i thinks

HH1 · 3 Jan 2013

Hi, have not used the product you specify but:-
The liquid dpm coverage could be a lot less depending upon surface texture, and they are not kidding, if it’s rough it will take a lot more to cover.
Usually, products need at least two coats.
On setting, it resembles a thick paint, almost a flexible rubber coating. (wickes liquid dpm)
Others are thinner and less flexible (zinnser)
Generally the coating needs further mechanical protection but this is taken care of by your screed.

Another product you could consider would by one of the epoxy, self levelling compounds, designed specifically to act as a dpm. Its more expensive though.
Both products to be doubly sure perhaps.

diynot

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liquid dpm coverage? advice please

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