Damp meters - TilersForums.com

[peckers]

Can anyone suggest a meter that can test sand cement screeded floors and also anhydrated floors as well?

Do they do one that will test both?
if not are there two seperate ones that peeps can suggest that wont break the bank?
what do you use for testing prior to tiling?

 

[DHTiling]

Standard or digital..?

 

[DHTiling]

Hair hygrometers are really good for gypsum screeds.

 

[peckers]

Standard or digital..?

I dont mind either as long as there accurate does anyone have a link that i could visit to have a look at these either standard or digital?
thanks..

 

[DHTiling]

How Does a Hair Hygrometer Work? | eHow.com


[ame=http://www.amazon.co.uk/Adorini-hair-hygrometer/dp/B000OY6AW4]Adorini hair hygrometer: Amazon.co.uk: Kitchen & Home[/ame]

but the kits re better.

Hygrometer

 

[peckers]

Thanks for the links dave, have had a look and im confused.com which do you use, or do you pull your hair out and stick them to plastic. i would be bold soon if i used this method

 

[DHTiling]

How to Set a Hygrometer | eHow.com

 

[Ajax123]

the correct test method based on BS8204 for testing moisture in either screed type is to use a simple analogue floor "hair hygrometer"

There is not an electronic meter which will accurately measure the moisture in an anhydrite screed full stop. the reason being that we look at such low moisture contents and the sulphate slats interfere with the electronic resistance reading so you can only ever get an indication from these meters.

Here is a link for the type of thing you should be looking at for anhydrite. They are about £85 plus postage last time I bought one.

broken link removed

If using a cement based adhesive you should aim for 75% or below and use an epoxy primer. Better still aim for below 85% rh and use a gypsum based tile adhesive with acrylic primer.