Reduced draughts
Helps control uncontrolled air movement through gaps and cracks.
Airtightness Services
Control unwanted air leakage.
Ecospec provides airtightness installation services for suitable homes and buildings, including airtight membranes, sealing around windows and doors, and detailed treatment of junctions and service penetrations.
Why airtightness matters
Insulation performs better when unwanted draughts are controlled.
Gaps and cracks in the building fabric can allow uncontrolled air movement, causing heat loss, cold draughts and uneven temperatures.
Airtightness work creates a continuous air-control layer around the heated part of the building. This layer must connect across walls, floors, ceilings, roofs, windows, doors and service openings.
Continuous air-control layer
Membrane System
Airtight membranes
A continuous sealed layer across suitable walls and roof areas.
Airtight membranes are fitted to the internal side of suitable walls, ceilings or roof structures to help control air movement through the building fabric.
The membrane must be installed continuously and connected to adjoining building elements. Overlaps, corners and edges are sealed using compatible tapes, adhesives and accessories.
Careful planning is required before internal finishes and services are installed, as unnecessary penetrations can damage the completed airtight layer.
- Installed across suitable walls, ceilings and roof structures
- Overlaps and edges sealed with compatible products
- Connected continuously at floors, walls and roof junctions
- Detailed around structural elements and openings
- Protected from avoidable damage during later work
Windows and doors
Seal the connection between frames and the building structure.
Window and door openings are common locations for unwanted air leakage, particularly where the frame meets the surrounding wall.
Airtight tapes, membranes and sealants can be used to connect the internal edge of the window or door frame to the airtight layer of the wall.
The details must allow for the frame, wall construction, internal finish and expected movement while maintaining a continuous seal around the full opening.
- Sealing around window and doors
- Connection to the wall’s airtight layer
- Detailed treatment of corners and reveals
- Compatible tapes, membranes and sealants
- Suitable for selected new-build and retrofit projects
Frame-to-wall connection
Windows & Doors
Pipes, cables and junctions
Detailed Sealing
Junctions and penetrations
Small openings can have a large effect on airtightness.
Pipes, cables, ducts, joists and structural connections all pass through or meet the airtight layer and must be sealed carefully.
Proprietary collars, tapes, adhesives and flexible sealants are used where appropriate to maintain continuity around each detail.
Services should be planned before the airtight layer is closed so penetrations can be grouped, reduced and sealed correctly.
- Pipes, cables and service penetrations
- Wall-to-floor and wall-to-ceiling junctions
- Roof timbers and structural connections
- Access hatches and recessed fittings
- Repairs to suitable damaged airtight areas
Our process
Plan the airtight layer before closing the building fabric.
Airtightness depends on continuity. The work should be coordinated with insulation, windows, doors, services, plastering and internal finishes.
Arrange an Assessment
01 — Review
Identify the intended airtight line and difficult junctions.
02 — Prepare
Ensure surfaces are clean, stable and suitable for tapes and adhesives.
03 — Install
Fit membranes and seal openings, edges and penetrations.
04 — Inspect
Check continuity before the airtight layer is covered.
Benefits of a carefully installed airtight layer.
Improved comfort
Supports more consistent internal temperatures across the building.
Better insulation performance
Helps insulation work as intended by reducing air movement through it.
Moisture management
Helps control the movement of moisture-laden indoor air into the building fabric.
Talk to Ecospec about airtightness.
Tell us about the building, the stage of the project and the areas requiring attention. Our team can advise on membranes, windows, doors and detailed sealing.