Thermal resistance

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).

Wooden floors are the better choice!

A 39 mm wood floor thickness = 0.2294W/m2k. = 2.29 tog
saving the resistance of 1.26 tog compare with the carpet.
We have other installation options below that improve resistance saving to as low as 1.29 tog, increasing your energy efficiency.


Cathedral Oak Planks
21 mm, 15 + 6

Option A:

6mm plywood bonded to screed with polyurethane adhesive.
Cathedral 21 mm plank fully bonded to the plywood with D3 moisture resistant PVA.
PVA is also required along the top of the tongues.
Total resistance = 0.1588 W/m2k. 1.58 tog

Option B:

9mm plywood bonded to screed with polyurethane adhesive.
Cathedral 21 mm plank fully bonded to the plywood with D3 moisture resistant PVA.
PVA is also required along the top of the tongues.
Total resistance = 0.1764W/m2k. 1.76 tog

Option C:

12mm plywood bonded to screed with polyurethane adhesive.
Cathedral 21 mm plank fully bonded to the plywood with D3 moisture resistant PVA.
PVA is also required along the top of the tongues.
Total resistance = 0.1941 W/m2k. 1.94 tog

Option D:

15mm plywood bonded to screed with polyurethane adhesive.
Cathedral 21 mm plank fully bonded to the plywood with D3 moisture resistant PVA.
PVA is also required along the top of the tongues.
Total resistance = 0.2117 W/m2k. 2.11 tog

Option E:

18mm plywood or chipboard bonded to screed with polyurethane adhesive.
Cathedral 21 mm plank fully bonded to the plywood or chipboard with D3 moisture resistant PVA. PVA is also required along the top of the tongues.
Total resistance = 0.2294W/m2k. 2.29 tog

Option F:

Fitting over UFH in batten or joisted floor
Choose your substrate, 12mm plywood, 18 mm chipboard etc.
The substrate and the Cathedral plank in length should be laid at 90º to the joist. The substrate should be laid with staggered joints. Screw the substrate to the batten / joist making sure that all joints are structurally supported and then fully bond the Cathedral floor to the substrate using PVA to bond wood to wood and Polyurethane to bond wood to Fermacell. Do not use liquid batten system. PVA is also required along the top of the tongues.

Option G:

Fitted over floated system UFH
The substrate should be laid with staggered joints floated 90º to the desired direction of the Cathedral flooring. Float the substrate over the UFH and then fully bond the Cathedral floor to the substrate using PVA to bond wood to wood and Polyurethane to bond wood to Fermacell. Do not use liquid batten system.


Cathedral Oak Planks
16 mm, 10 + 6

Option A:

6mm plywood bonded to screed with polyurethane adhesive.
Cathedral 16 mm plank fully bonded to the plywood with D3 moisture resistant PVA.
PVA is also required along the top of the tongues.
Total resistance = 0.1294 W/m2k. 1.29 tog

Option B:

9mm plywood bonded to screed with polyurethane adhesive.
Cathedral 16 mm plank fully bonded to the plywood with D3 moisture resistant PVA.
PVA is also required along the top of the tongues.
Total resistance = 0.1471 W/m2k. 1.47 tog

Option C:

12mm plywood bonded to screed with polyurethane adhesive.
Cathedral 16 mm plank fully bonded to the plywood with D3 moisture resistant PVA.
PVA is also required along the top of the tongues.
Total resistance = 0.1674 W/m2k. 1.65 tog

Option D:

15mm plywood bonded to screed with polyurethane adhesive.
Cathedral 16 mm plank fully bonded to the plywood with D3 moisture resistant PVA.
PVA is also required along the top of the tongues.
Total resistance = 0.1824 W/m2k. 1.82 tog

Option E:

18mm plywood or chipboard bonded to screed with polyurethane adhesive.
Cathedral 16 mm plank fully bonded to the plywood or chipboard with D3 moisture resistant PVA. PVA is also required along the top of the tongues.
Total resistance = 0.2000 W/m2k. 2.0 tog

Option F:

Fitting over UFH in batten or joisted floor
Choose your substrate, 12mm plywood, 18 mm chipboard etc.
The substrate and the Cathedral plank in length should be laid at 90º to the joist. The substrate should be laid with staggered joints. Screw the substrate to the batten / joist making sure that all joints are structurally supported and then fully bond the Cathedral floor to the substrate using PVA to bond wood to wood and Polyurethane to bond wood to Fermacell. Do not use liquid batten system. PVA is also required along the top of the tongues.

Option G:

Fitted over floated system UFH
The substrate should be laid with staggered joints floated 90º to the desired direction of the Cathedral flooring. Float the substrate over the UFH and then fully bond the Cathedral floor to the substrate using PVA to bond wood to wood and Polyurethane to bond wood to Fermacell. Do not use liquid batten system.


Vicarage Oak Planks
16 mm, 12 + 4

Option A:

6mm plywood bonded to screed with polyurethane adhesive.
Vicarage 16 mm plank fully bonded to the plywood with D3 moisture resistant PVA.
PVA is also required along the top of the tongues.
Total resistance = 0.1294 W/m2k. 1.29 tog

Option B:

9mm plywood bonded to screed with polyurethane adhesive.
Vicarage 16 mm plank fully bonded to the plywood with D3 moisture resistant PVA.
PVA is also required along the top of the tongues.
Total resistance = 0.1471 W/m2k. 1.47 tog

Option C:

12mm plywood bonded to screed with polyurethane adhesive.
Vicarage 16 mm plank fully bonded to the plywood with D3 moisture resistant PVA.
PVA is also required along the top of the tongues.
Total resistance = 0.1674 W/m2k. 1.65 tog

Option D:

15mm plywood bonded to screed with polyurethane adhesive.
Vicarage 16 mm plank fully bonded to the plywood with D3 moisture resistant PVA.
PVA is also required along the top of the tongues.
Total resistance = 0.1824 W/m2k. 1.82 tog

Option E:

18mm plywood or chipboard bonded to screed with polyurethane adhesive.
Vicarage 16 mm plank fully bonded to the plywood or chipboard with D3 moisture resistant PVA. PVA is also required along the top of the tongues.
Total resistance = 0.2000 W/m2k. 2.0 tog

Option F:

Fitting over UFH in batten or joisted floor

Choose your substrate, 12mm plywood, 18 mm chipboard etc.
The substrate and the Vicarage plank in length should be laid at 90º to the joist. The substrate should be laid with staggered joints. Screw the substrate to the batten / joist making sure that all joints are structurally supported and then fully bond the Vicarage floor to the substrate using PVA to bond wood to wood and Polyurethane to bond wood to Fermacell. Do not use liquid batten system. PVA is also required along the top of the tongues.

Option G:

Fitted over floated system UFH
The substrate should be laid with staggered joints floated 90º to the desired direction of the Vicarage flooring. Float the substrate over the UFH and then fully bond the Vicarage floor to the substrate using PVA to bond wood to wood and Polyurethane to bond wood to Fermacell. Do not use liquid batten system.

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