Underlayment for Laminate Floor (moisture barrier)

[bobby5000]

Hi all,

I have a bungalow with concrete subfloors. They've recently been primed and leveled using latex screed. There is no DPM in the floor, the house was built in the early 60s. Previous tests before self leveling showed humidity levels higher than ideal.

My question is: for a Laminate floor, would an underlay system with built in moisture barrier be sufficient to address the issue of rising moisture?

I gather that these barriers still allow moisture through, but slow the rate down. Is this correct? So I don't need to worry about moisture building up underneath the underlay, or making its way to the sides and up the walls instead?

For some reason, my floor levels are a bit above the DPC and there is typically a small gap between the sub base and wall around the edges where a skirting board would be located.

Would be grateful for advice.
Many thanks

 

[dazlight]

It would be worth using a liquid Dpm on the sub floor. Like uzin PE404 or ardex DPM1c

a good underlay we use is Timbermate excel

 

[bobby5000]

It would be worth using a liquid Dpm on the sub floor. Like uzin PE404 or ardex DPM1c

a good underlay we use is Timbermate excel

Hi mate,

Would that type of DPM be a 100% barrier? In which case, is it likely to force moisture out to the walls?

Also, do you think an underlay with moisture barrier is insufficient then? Trying to keep costs down if I can help it.

 

[dazlight]

Keep coats down just use the underlay.

but a moisture suppressant lets moisture through slow so controls it.