I have an interesting 'situation' with one of my clients, and wondering if anyone one here has some experience of underfloor heating in screed.
The job is a new build outbuilding/office in a garden, only about 22sqm.
The client sourced and purchased underfloor heating cable to install in the screed during the build (the supplier did the calcuations and specced a suitable product) and I was asked in to test and connect up.
The tests were all fine and the heating was connected up temporarily earlier this week, but has proved completely unable to produce any real heat on the surface of the floor at all - the most that can be detected is minimal warmth in some areas, and a lack of cold in the rest. The clients (not calibrated!) thermometer registers about 15C when left on the floor.
Now I've looked at all the paperwork, the supplier specified a 2100W cable, equating to just over 96W/sqm. This is installed as required, with insulation below and 70mm screed on top.
Given that most mats (which are only installed in 5-10mm adhesive/compound) seem to run at 150-200sqm, it looks to me as if the cable is just not up to the job of primary room heating, which is what the client wanted.
Having said that, I have little experience with under floor heating, so anyone out there have a more educated opinion?
The original supplier are going to come and 'inspect' the job, but it now appears that 99% of their work is wet, so have they just got their calculations wrong?
The job is a new build outbuilding/office in a garden, only about 22sqm.
The client sourced and purchased underfloor heating cable to install in the screed during the build (the supplier did the calcuations and specced a suitable product) and I was asked in to test and connect up.
The tests were all fine and the heating was connected up temporarily earlier this week, but has proved completely unable to produce any real heat on the surface of the floor at all - the most that can be detected is minimal warmth in some areas, and a lack of cold in the rest. The clients (not calibrated!) thermometer registers about 15C when left on the floor.
Now I've looked at all the paperwork, the supplier specified a 2100W cable, equating to just over 96W/sqm. This is installed as required, with insulation below and 70mm screed on top.
Given that most mats (which are only installed in 5-10mm adhesive/compound) seem to run at 150-200sqm, it looks to me as if the cable is just not up to the job of primary room heating, which is what the client wanted.
Having said that, I have little experience with under floor heating, so anyone out there have a more educated opinion?
The original supplier are going to come and 'inspect' the job, but it now appears that 99% of their work is wet, so have they just got their calculations wrong?