Dynamic insulation
Air control layer
The maximum depressurisation for a dynamically insulated building is normally limited to 10 Pa in order to avoid doors slamming shut or difficulty in opening doors.

Dynamic insulation

Section Title: Air control layer
Table Section Text: The maximum depressurisation for a dynamically insulated building is normally limited to 10 Pa in order to avoid doors slamming shut or difficulty in opening doors.

Material	Density (kg/m3)	Permeability (m2/hPa)	Component	Permeance(m3/m2hPa)	Pressure Drop1 (Pa)

Plasterboard	1.06x10-5	12 mm sheet	8.81x10-4	1140

Thermal block	850	1.6x10-5	100 mm block	1.6x10-4	526

Fibreboard	1.34x10-3	12 mm sheet	0.116	8.6

“Pumalite”	870	0.036	100 mm block	0.36	2.8

Cellulose / wet blown	47	0.283	200 mm	1.50	0.67

Cellulose / dry blown	65	0.25	150 mm	1.67	0.60

Sheep's wool	28	1.8	140 mm	13.0	0.08

Sentence(s)

Fibreboard has an air permeability of 1.34x10−3 (m²/hPa).

final_sentence: Fibreboard has an air permeability of 1.34x10−3 (m²/hPa).