Passive House

Airtight Home

Employing an airtight home with the application of airtight membrane and tape is
imperative to achieving the Passive House standard.

Airtight Home | MBC Timber Frame


Creating an airtight home with the application of airtight membrane and tape is imperative to achieving the Passive House standard. Where there are any gaps, leaks or draughts in the building envelope, uncontrolled amounts of cold external air will infiltrate the building, resulting in masses of heated internal air being lost and hemorrhaging out of the building. This loss of heat invariably increases a buildings overall energy demand and significantly increases heating costs. The airtight system is a key element of the Passive House system, as it prevents condensation penetrating the structural timber frame; condensation which can lead to corrosion and decay.

An air tight home is achieved with the careful application of an internal airtight membrane sheeting, which overlaps at joints and junctions, and is sealed with airtight tape. Where elements puncture through the membrane, such as service pipes, ducting,  joists and electric cabling, or where there is an opening in the building structure, such as an external door or window,  extra care is given when applying the membrane and tape, ensuring the integrity of the airtight system. The airtightness of a passive house is tested using the Blower Door Test.

Harrison Timber Frame Wall Interior

Roof joists coming through airtight membrane and sealed with airtight tape around each individual roof joist

air tight

Airtight membrane carefully fitted at window openings and sealed at angles and corners with precision airtight tape application

As the Passive House building system is an intentionally airtight structure, and consequently a less ventilated structure, the need for a source of fresh air is apparent. While opening a window does provide a certain amount of ventilation, the building’s heat is quickly lost. To overcome this obstacle, a Heat Recovery Ventilation (HRV) unit is employed to introduce fresh, heated or cooled air into a building, resulting with improved climate control within the building and efficient energy usage.  Click here to read more about Heat Recovery Ventilation Units.

Discuss your project with us

MBC specialise in the production of Timber Frame Passive House Buildings and High Thermal Efficiency Timber Frame Houses throughout the UK, Fulfil your dream of a self built home and benefit from huge energy savings and reduce their heating demands by up to 90%. 

Passive Builds

Passive Builds

Precisely engineered Passive solutions from MBC Timber Frame requiring 90% less energy for space heating and cooling.

Near Passive

Near Passive Builds

MBC Timber Frame’s “optional levels of insulation” applied to a 140mm stud frame. 3 great options delivery differing U-Values.

Passive Foundation

Passive Foundations

The MBC Passive Foundation system, suitable for both Passive and Standard timber frame projects.


Truss and Joists

Metal web Joists and Roof Trusses available on a supply only basis for traditional build projects.

A super insulated, timber frame house, providing exceptional energy efficiency for your new home, using the best timber available

Designed and engineered in accordance with current building regulations, perfect for you self builders

Manufactured in a controlled factory environment, ensuring superior quality craftsmanship

An affordable, competitively priced building option using our timber frame kits creating luxurious living space

Erected on site at an unparalleled rate when compared to conventional block construction

An environmentally conscious and forward thinking sustainable approach for your new dream home

Get in touch with MBC Timber Frame

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