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Roof insulation

The roof is the largest area of heat loss in a house besides the facade. Without adequate insulation, about 30% of household heat is lost through the roof. That is why a good roof insulation is vitally important when it comes to saving money on your heating bills as well as supporting the environment.

Insulating the roof serves a simple purpose: as warm air tends to rise it makes sense to keep the produced heat within the building.

Nowadays, roof insulation criteria are ruled by legislation in order to actively contribute to an energy turnaround. The energy saving regulations (EnEV) define a set of parameters relevant for roof insulations. As buildings are individual, there are various methods available to guarantee optimal roof insulation.

Video roof insulation on a building site

Examples of use

Roof Construction D1, full rafter insulation - additional storage mass efficiency inside
Construction Thickness
1. Roof covering  
2. Roof lathing 4/5 40 mm
3. Counter lathing 5/8 50 mm
4. THERMOFLOC Roof sheathing roll  
5. Roof sheathing 24 mm
6. Rafters/THERMOFLOC Fibre * 140-300 mm *
7. THERMOFLOC Vapour barrier  
8. Lathing e=30,00-40,00 cm 50 mm
9. Gypsum wallboard 15 mm
*THERMOFLOC insulation thickness in mm = calculated U-value (W/m²K)
140 mm = 0,21 160 mm = 0,19 180 mm = 0,17 200 mm = 0,16 220 mm = 0,15 240 mm = 0,13 260 mm = 0,13 280 mm = 0,12 300 mm = 0,11
Roof Construction D3, full rafter insulation with balancing lathing and roof sheathing

Construction Thickness
1. Roof covering  
2. Roof lathing 4/5 40 mm
3. Counter lathing/Support lathing 5/8 50 mm
4. Roof sheathing  
5. Rafters/THERMOFLOC Fibre * 140-300 mm *
6. THERMOFLOC Vapour barrier  
7. Balancing lathing e=30-40 cm 24 mm
8. Gypsum wallboard 12,5 mm
* THERMOFLOC insulation thickness in mm = calculated U-value (W/m²K)
140 mm = 0,25 160 mm = 0,22 180 mm = 0,19 200 mm = 0,18 220 mm = 0,16 240 mm = 0,15 260 mm = 0,14 280 mm = 0,13 300 mm = 0,12
Roof Construction D4, full rafter insulation with OSB and soft fiberboard

Construction Thickness
1. Roof covering  
2. Roof lathing 4/5 40 mm
3. Counter lathing 5/8 50 mm
4. Bit. soft fibreboard 19 mm
5. Rafters/THERMOFLOC Fibre * 140-300 mm *
6. OSB/Plywood 12,5 mm
7. Gypsum walboard 12,5 mm
* THERMOFLOC insulation thickness in mm = calculated U-value (W/m²K)
140 mm = 0,22 160 mm = 0,20 180 mm = 0,18 200 mm = 0,16 220 mm = 0,15 240 mm = 0,14 260 mm = 0,13 280 mm = 0,12 300 mm = 0,11
Roof Construction with insulation above rafters D5, outside roof sheathing, vapor permeable roof sheathing, visible rafter inside
Construction Thickness
1. Roof covering  
2. Roof lathing 4/5 40 mm
3. Counter lathing 5/8 50 mm
4. THERMOFLOC Roof sheathing roll  
5. Roof sheathing 24 mm
6. Construction timber/THERMOFLOC Fibre * 140-300 mm *
7. THERMOFLOC Vapour barrier  
8. Fireproof sheathing 38 mm
9. Rafters visible  
* THERMOFLOC insulation thickness in mm = calculated U-value (W/m²K)
140 mm = 0,23 160 mm = 0,20 180 mm = 0,18 200 mm = 0,17 220 mm = 0,15 240 mm = 0,14 260 mm = 0,13 280 mm = 0,12 300 mm = 0,11
Roof Construction with insulation above rafters D6, with OSB and soft fibreboard
Construction Thickness
1. Roof covering  
2. Roof lathing 4/5 40 mm
3. Counter lathing 5/8 50 mm
4. Bit. soft fibreboard 19 mm
5. Rafter/THERMOFLOC Fibre * 140-300 mm *
6. OSB/Plywood 12,5 mm
7. Rafters visible  
* THERMOFLOC insulation thickness in mm = calculated U-value (W/m²K)
140 mm = 0,22 160 mm = 0,20 180 mm = 0,18 200 mm = 0,16 220 mm = 0,15 240 mm = 0,14 260 mm = 0,13 280 mm = 0,12 300 mm = 0,11
Roof Construction, Passive House D7
Construction Thickness
1. Roof covering  
2. Roof lathing 4/5 40 mm
3. Counter lathing 5/8 50 mm
4. Bit. soft fiberboard 35 mm
5. Double web T-beam/THERMOFLOC Fibre * * 140-400 mm *
6. OSB/Plywood 15 mm
7. Gypsum wallboard 12,5 mm
* THERMOFLOC insulation thickness in mm = calculated U-value (W/m²K)
140 mm = 0,22 180 mm = 0,18 220 mm = 0,15 260 mm = 0,13 300 mm = 0,11 340 mm = 0,10 400 mm = 0,09

 

THERMOBAG System
Insulation of existing structures. 

The THERMOFLOC THERMOBAG system provides a way to insulate existing roof areas clean and cost-effectively. The only requirement is suitable access to the partitions via the top storey of the building. The THERMOBAG consists of a vapor barrier on the room side (SD value approx. 10 m) beneath a vapor open (SD value < 0.04 m), water impermeable PP membrane on the outside for optimum protection of the thermal insulation.

Good to know...

The THERMOBAG system is not a replacement for a functioning sub-roof; rather it protects the installed insulation against weather-related moisture and airflow. It must be kept in mind, that due to the set size of the compartment space, there are limits as to the thickness of the insulation layer (maximum thicknesses up to 20 cm can be achieved).

THERMOBAG system – step by step:

  1. Put the THERMOBAG in the compartment space. Carefully and with the help of rods if required, position the empty THERMOBAGS into the optimum position.
  2. Cut the THERMOBAG to the respective compartment lengths, fold accordingly and seal on one side with staples. Now, the THERMOBAGS can be inflated with blown-in insulation until the
  3. compartment space is completely filled. Then, the bags are securely sealed with staples and adhesive tape. The rafter insulation is finished!