Carpet Less Than 1 5 Tog

As nzs 1385 specifies the following commercial tolerances for.

Carpet less than 1 5 tog.

This is not the case. As well as the tog rating of the carpet you must also consider the tog rating of the underlay. Tog values typical brintons 80 wool 20 nylon carpets have a tog value 1 4 and 2 3. The best carpets to use with underfloor heating are those with tog ratings of less than 1 5.

This theoretically means that shaw carpets in the 4 5 rating would be ideal for areas where there is going to be a lot of traffic like hallways and stairs whilst a rating of less than 2 5 is going to be better in an area that isn t used so. Please note that the insulating effect of underlay and carpet are to some extent cumulative. The combined value of the carpet and underlay should not exceed 2 5 tog and preferably less than 1 5 for heat pump systems. Figures between 0 80 and 1 50 tog have been quoted by manufacturers foam underlays generally have a lower tog rating than felts.

We would suggest a target tog should be 0 8 or less. The previous industry standard has been to advise that the carpet and underlay should not exceed a tog rating of 1 5. In conjunction with the underfloor heating manufacturers association the carpet foundation carried out a research project. 0 n narrow loom widths usually woven only are 0 69m 0 9m l 0m 2 0m.

This showed that a carpet underlay with a combined thermal resistance of less than 2 5 togs allows underfloor systems to operate efficiently. A lightweight 60 90 oz sponge underlay generally has a relatively low tog rating of 0 5 which makes this type of underlay most suitable for use with underfloor heating. We can offer the following information which has been taken from test reports in accordance with bs 4745 two plate test from bttg shirley. Suppliers however have stated that carpet must have a thermal resistance of no more than 1 5 1 7 tog.

Our 80 wool 20 nylon carpets have a tog value somewhere between 1 4 and 2 3. It makes sense to take care in choosing carpet and underlay that will work well with the underfloor heating. Underfloor heating is growing in popularity. If you are looking for an underlay for underfloor heating in combination with a carpet this is quite a specialist requirement.

However research conducted by bsria in bracknell and funded by the carpet foundation in conjunction with the underfloor heating manufacturers association uhma has proved conclusively that any carpet can be used with an underfloor heating system without impairing the performance of the system. Heat exchange between floor surface and carpet is further insulated by the type of underlay used.