i know we've been over this somewhere but i can't find the results i want? I have just got back from hols & have to start a job tomorrow.I have a Tramex CME Expert what is a safe reading to lay marmoleum on.I took readings 2 to 3 weeks ago they were 4.5% max i told them to get the air circulating with some heat. I know this will be lower now,what's good too go?I am meeting the surveyor at 8am he does not want a surface DPM unless we have readings above recomendation.
Thanks Spacey But the Tramex doesn't read in RH it reads as a % with 6.9% as saturation.Thanks again for your input thou. Tony
Sorry mate but spacey is right its %rh or it doesn't count You can get the digi hygro boxes for about £100 or so that will do the job spot on you'll get a 'rough reading' from the saturation % but for a 100% accurate 'in court' reading its gotta be RH%
I take on board all you are both saying but someone must use a Tramex & know what the safe percentage reading is.
Only an rh% reading from a hydro box conforms to BS standards for measuring moister ! Ask Matt about tramex readings !
3-3.5% for an old slab. But a hygrometer is the correct way. Tramex might be worth a call. The guys at Harrogate told me if its a new slab 75%, if its an old slab needs to be lower. I wouldn't use this way, always a hygrometer box. This was for the tramex meter that I brought from Floorskills- hydro floor kit. Can't think what meter that is.
One from this range cre8tive Cmexpert 2 or MRH3 in www.tradediscountshop.co.uk I've asked Andrew Rynhart from Tramex to log in and answer your questions
Thanks Mario, Someone from Tramex was meant to get back to me yesterday but no call. We have received our parcel, thanks.
There is no true conversion from MC to RH. They are two completely different readings. RH = the amount of moisture leaving the concrete MC = the amount of moisture by weight in the concrete. As a general rule , 3-3.5 % is around 75% rh but is not a true guide as every floor is different. The tramex will also read RH depending on which one you are using. However this is a 72hr test to meet BS Standards. The tramex reading in MC is only good to tell you where to set up a RH test while you live in the U.K.
Hi All, firs of all TonyA, apologies if we were to call you and did not. Please send me your contact detail and I will call you when you are free. We have been running a seminar with the National Flood School and a number of us have been out of the office. When it comes to acceptable moisture content readings we go by the British Standards or by Flooring Manufacturers specifications. The British standards says that the ERH must be below 75% and most of the flooring manufacturers who specify the Tramex CME test say that the slab must be below 4% for engineered and vinyl or below 3% for solid wood. We feel that the most failsafe test is a combination of mapping with the Tramex CME and ERH readings. As Cre8tive flooring mentioned, the British standards are meant for new slabs which are drying, if it is an old slab the ERH should be below about 65% or else there is a possibility that moisture is still being introduced into the slab. A completely dry concrete slab in the UK will read between 2% and 2.5% on the Tramex Concrete meter. Here is a short video we made describing the different tests. http://www.youtube.com/watch?v=beFo3fupwVU
