CASE STUDY
Mount House
Products used
Sieger Slim Sliding Door, Sieger Lux Casement Door, Structural Glazing, Gable End Glazing
Location
U.K
Completion date
Project Overview
Mount House is a residential renovation in which a rarely used secondary building was connected to the main home and converted into a functional living space. The glazing package combines a thermally broken structural glass link, a Sieger Slim Sliding Door, a Sieger Lux Casement Door and a large gable end window.
At the rear, the sliding doors and fixed gable glazing form a full-height glass facade that introduces daylight and garden views across the new interior. The frameless glass link establishes a clear connection between the two buildings, while the separate casement door provides an additional access point at the side of the renovated space.
Project Challenges
Connecting two buildings without a visually heavy link
The principal challenge was to bring the secondary building into regular use without creating a solid connection that would reduce daylight or obscure the distinction between the two structures. The link needed to provide a thermally insulated internal route while remaining visually lightweight.
The renovated space also required significantly more daylight and a direct connection to the garden. The rear elevation therefore needed to combine an opening system with fixed glazing above, creating a larger glazed facade without introducing excessive frame lines.
A separate side entrance was also required. This opening needed to sit against the traditional brickwork while remaining consistent with the minimal aluminium language of the sliding doors and structural glass.
Project Solutions
Frameless glass link with a full-height rear glazing composition
A thermally broken structural glass link was used to connect the secondary building to the main house. Concealed framing allows the link to remain visually minimal, preserving views between the two structures while supporting year-round thermal performance.
At the rear, a Sieger Slim Sliding Door was installed beneath a large fixed gable end window. Aligning the opening doors and upper glazing creates a full-height glass facade, bringing daylight into the interior and directing views towards the garden. The sliding system incorporates a flush threshold so the internal floor can continue towards the external space with minimal interruption.
A Sieger Lux Casement Door was positioned at the side of the renovated building to provide an additional entrance. Its large glazed leaf and dark aluminium framing create a contemporary contrast with the surrounding brickwork while maintaining a consistent relationship with the wider glazing package.
Project Highlight
The rear elevation combines a slim sliding door system with fixed gable glazing above to form a continuous full-height glass facade. This arrangement increases daylight and garden views while allowing the lower section to open directly to the exterior through a flush threshold.
End Result
Performance considerations
The structural glass link uses a thermally broken fixing system to reduce thermal bridging between the two buildings while retaining a frameless appearance. This allows the connection to function as part of the internal environment throughout the year rather than as a lightly insulated external passage.
The sliding doors use a 20mm vertical junction to minimise visible framing across the rear elevation. Tested air, water and wind performance supports their use as a large external opening, while the flush threshold improves movement between the renovated room and garden.
The aluminium casement door provides a separate weather-resistant access point, with thermally broken framing supporting internal comfort. Together, the structural glass, sliding doors, gable glazing and casement door provide daylight, ventilation and access without disrupting the restrained material palette of brick, glass, dark aluminium and timber.
Sieger’s conclusion
Mount House demonstrates how a structural glass link and sliding doors can bring an underused secondary building into the main living arrangement of a home. The coordinated glazing package improves daylight, creates direct garden access and preserves a clear architectural distinction between the connected structures.
This approach is suited to architects, designers and homeowners renovating properties with outbuildings, side structures or separate wings that require a thermally insulated but visually lightweight connection.
To discuss a similar renovation, contact Sieger Systems for technical advice on structural glass links, slim sliding doors, gable glazing and aluminium casement door specification.
Secondary building connected to the main home
Full-height daylight introduced at the rear elevation
Flush access created between the interior and garden
Consistent minimal framing across all glazing elements
Technical specifications
| Sieger Slim Sliding Door | 20mm vertical junction sightline, glass thickness up to 30mm, sliding panes up to 2500mm wide × 3000mm high, pane weights up to 320kg and typical Uw value of 1.3 W/m²K. |
| Sliding Door Performance | Air permeability Class 4, water tightness Class 7A, wind resistance Class C5, acoustic reduction up to 41dB and locking at up to four points, depending on height. |
| Project Sliding Arrangement | Slim sliding door installed beneath fixed gable glazing to create a full-height rear glass facade, with a flush threshold providing direct garden access. |
| Structural Glass Link | Thermally broken fixing profile with a 63mm depth, maximum glass thickness of 41.5mm and expected Uw value of 1.1 W/m²K. Minimum fixing setback is 55mm, with a structural deflection allowance of 5mm. |
| Sieger Lux Casement Door | 101mm profile sightline, glass thickness from 24mm to 40mm, maximum leaf size of 1200mm wide × 2400mm high and maximum leaf weight of 90kg. Uw values from 1.4 W/m²K. |
| Casement Door Performance | Air permeability Class 4, water tightness Class 9A and wind resistance Class A3. |
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