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Underfloor Heating

In excess of a million m2 of this product has been laid over the last 9 years with outstanding results and we have not had a single failure with Cathedral Flooring when it has been fitted to our specification over Underfloor Heating. Cathedral Flooring has been subjected to extensive testing which has been carried out in conjunction with two of the UK's largest Underfloor Heating Companies.


When installed over under floor heating Cathedral flooring must be fully bonded to a suitable substrate:

There are various methods of installing Cathedral Floors over under floor heating systems to take into account the type of heat source, expected operating temperatures and type of floor covering build up.

When installed over under floor heating Cathedral flooring must be fully bonded to a suitable substrate because: it works as a lateral tie to bond the individual boards together and in the case of floating floors reduces rotational movement at board joints to decrease movement and undulation when walked on.

The substrate ensures a greater area of bond to a sub floor by joining the boards together. The risk of separation from the screed is far greater for individual boards bonded to the screed. By bonding the boards to a sheet substrate and bonding the substrate down the risk of release is massively reduced by the larger overall contact area. In many cases where floors release from the screed it is found that the adhesive has not failed but the screed has separated from itself. Trying to take up individual boards to relay is very difficult. Normally as the problem boards are taken up other boards are loosened and you find yourself chasing your tail. The chance of a board 1200 x 2400 releasing is very slim but if it did the floor would still serve as a mass diaphragm-floating floor.

The substrate helps to disburse heat more evenly onto the floorboards and elevates hotspots, eliminates the possibility of convected air between joints which could lead to floor failure over time and acts to support header/butt joints of floorboards laid over joist, so there is no need to cut boards back to joist for support of header joints.

The substrate in length should be laid with staggered joints at 90º to the length of the Cathedral plank for the best lateral stability. This may however be impractical over joists.
The following options include relative calculations of output and energy efficiency.

Carpets and under floor heating
The maximum tog value of a carpet to be laid over under floor heating is 2.5 tog (0.25 w/m2k).
In a timber floor system R = 0.00 includes a layer of 18 mm chipboard and then the
2.5 tog carpet is allowed as an overlay.
The total resistance of the carpet at 2.5 tog and the chipboard at 1.05 tog is 3.55 tog (0.355 w/m2k).




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