Measuring damp

[joelpeyton]

Whats the best tool to measure dampness in my concrete floor, I want to lay solid wood on top

 

[Petest67]

One of these

http://www.f-ball.co.uk/product_detail.asp?product=Digital Hygrometer&catID=damp

Test with a handheld meter first to get an indication (tramex / protimeter) then use boxes. You can use a protimeter hygromaster with sleeves that are inset into holes in the concrete but the only recognised test to BS is the hyrometer box.

If in doubt always apply a liquid DPM, its costly but far cheaper than having to replace the floor.

 

[WoodYouLike]

If the floor is really wet (not sure which method you use, but based on our method: too wet is over 4.5% moist) a liquid DPM won't help.

 

[joelpeyton]

Thanks for replies.

Which method is this?

(not sure which method you use, but based on our method: too wet is over 4.5% moist)

Update:

Just tested the floor with a damp tester, nothing fancy, just a cheapy but the needle went off the scale.

I am thinking this is going to be too wet for a liquid dpm.

Whats the next step?

Floor up, new dpm, new slab and screed?