What Is Tog Rating Carpet

A low rating is perfect for use with under floor heating while a high rating means the carpet and underlay already offer good insulation and therefore isn t suitable for under floor heating.

What is tog rating carpet. We recommend that the combined tog rating of carpet and underlay doesn t exceed 2 5. The tog of the carpet tells you how insulated it is generally the lower the tog the less insulation it provides so opt for a low tog carpet if you have underfloor heating. We provide the tog rating for all our carpets on the carpet ranges page. The shirley institute in manchester england developed the tog as an easy to follow alternative to the si unit of m 2 k w.

Tog means thermal overall grade. The higher a material s tog rating the more effective it will be at retaining heat and the better it will be as an insulating material. If using underlay with underfloor heating you won t need anything above a total rating of 2 5 tog. The tog is a measure of thermal insulance of a unit area also known as thermal resistance it is commonly used in the textile industry and often seen quoted on for example duvets and carpet underlay.

Therefore in the case of a flooring underlay the tog rating refers to the difference in temperature between the top and bottom layers. A tog rating indicates the effectiveness of a materials heat insulation. Carpet at 1 70 underlay at 1 40 1 70 1 40 1 0 2 10 tog suitable for floors 2 11 tog and. Wool carpets have a higher tog rating naturally than other fibers as do foam underlays over felts.

Underlays come with a tog rating the higher the tog the better the insulation. In more technical terms a tog equates to ten times the temperature difference measured in c between two surfaces of a given material when the flow of heat is equal to one watt per square meter. To determine a working approximation the tog rating of both carpet and underlay should be added together and 1 0 tog subtracted. Tog ratings all our wool wool blend and polypropylene carpets meet the requirements for underfloor heating with tog values well within the recommended tolerances.

Extensive research has shown that this calculation gives a more realistic value of the total tog value. Carpets with a lower tog rating are ideal for rooms with underfloor heating whereas higher tog ratings are better for typically colder areas. Both underlay and carpet carry a tog rating. Both the carpet and the underlay will have a separate tog rating and a combined rating over 2 0 isn t really suitable for underfloor heating.

Every home is different so ask our experts in store to help you understand exactly what it is you need. There are many factors that contribute to an individual carpets or underlays tog rating.