Section 03 of 04
Fifty pascals, and whether the house holds
The only whole-building fabric measurement there is. A calibrated fan takes the envelope to a stated pressure and the flow needed to hold it becomes the result — followed by the question of what happens to ventilation once the building is tight.
PLATE 1Fifty pascals is high enough to swamp wind and stack effects and low enough to leave the fabric undisturbed.
Start here
Fifty pascals, and whether the house holds
The blower-door test pressurises the whole building and measures the flow needed to hold it, which is the only whole-building fabric measurement there is.
Everything in this section
Fifty pascals, and whether the house holds
The blower-door test pressurises the whole building and measures the flow needed to hold it, which is the only whole-building fabric measurement there is.
Where the air actually goes
Service penetrations, loft hatches and the gap behind a dry lining account for most of it, and none of them are on a drawing.
Tight, and then ventilated on purpose
Air-tightness without designed ventilation moves the problem rather than solving it.
The other sections
Every guide, listed →
Section 03 of 04
Fifty pascals, and whether the house holds
The only whole-building fabric measurement there is. A calibrated fan takes the envelope to a stated pressure and the flow needed to hold it becomes the result — followed by the question of what happens to ventilation once the building is tight.
PLATE 1Fifty pascals is high enough to swamp wind and stack effects and low enough to leave the fabric undisturbed.
Start here
Fifty pascals, and whether the house holds
The blower-door test pressurises the whole building and measures the flow needed to hold it, which is the only whole-building fabric measurement there is.
Everything in this section
Fifty pascals, and whether the house holds
The blower-door test pressurises the whole building and measures the flow needed to hold it, which is the only whole-building fabric measurement there is.
Where the air actually goes
Service penetrations, loft hatches and the gap behind a dry lining account for most of it, and none of them are on a drawing.
Tight, and then ventilated on purpose
Air-tightness without designed ventilation moves the problem rather than solving it.
The other sections