Pitched Internally Fitted

The system complies with the most stringent of standards – from baseline building regulations through to Passivhaus.

The system is suitable for most internal finishing options, including lime plaster, clay plaster or plaster board finish. All components for the system are available from NBT.

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System Image

Cross Section of System

  1. Existing tiles/slates
  2. Existing non-breathable felt
  3. New treated timber battens (min. 45mm height), fixed to existing rafters to create ventilation area
  4. NBT system glue (to seal battens to rafters and woodfibre boards to battens
  5. NBT ISOLIAR. Option A: fixed to the battens. Option B: fixed to the rafter.
  6. NBT PAVAFLEX between battens. Option A: NBT DB 3.5 airtightness membrane can be installed after this layer
  7. NBT ISOLAIR OR PAVATHERM-COMBI
  8. a) NBT lime-based plaster system. b) NBT DB 3.5 airtightness membrane; service void and plasterboard

Product Downloads

System Performance

u-values
0.30 - 0.10
y-values
0.05 - 0.02
Airtightness
5 - 0.6 @50pa

Components and Accessories for Pitched Internally Fitted

1

Isolair

2

Pavaflex-375

3

Air Tight Membrane: DB 3.5

4

Pavatherm-Combi

5

Pavacoll

6

Pavatape: 75/150

7

Pavabase

8

VHT-R 4.8