Structural Survey & Conservation Engineering of the Historic Roerich House
ROERICH ESTATE, KULLU
Naggar, Himachal Pradesh, India · 2012–2013
Ivan Strelbitskii carried out the structural survey and developed engineering conservation solutions for the main house of the historic Roerich Estate in Naggar, in the Himalayan Kullu Valley.
The work covered foundations, load-bearing stone masonry, traditional timber seismic reinforcement, floors, roof structures and drainage, followed by the development of targeted structural and conservation measures.
The work covered foundations, load-bearing stone masonry, traditional timber seismic reinforcement, floors, roof structures and drainage, followed by the development of targeted structural and conservation measures.
THE HISTORIC BUILDING
Himalayan heritage house combining Scottish-influenced design with local construction traditions
The main house of the Hall Estate was built in 1880 by British landowner Henry Rennick and was acquired by the Roerich family in 1929. The estate later became closely associated with the Roerichs’ cultural and research activities in the Himalayan region.
The two-storey building is constructed from local stone masonry laid in lime-clay mortar. Its structure combines Scottish-influenced design with local building traditions, most notably a system of horizontal timber seismic reinforcement incorporated within the masonry walls. Paired timber members run along both sides of the walls and are connected by transverse elements, helping to tie the masonry together and improve its resistance to seismic movement.
The main house of the Hall Estate was built in 1880 by British landowner Henry Rennick and was acquired by the Roerich family in 1929. The estate later became closely associated with the Roerichs’ cultural and research activities in the Himalayan region.
The two-storey building is constructed from local stone masonry laid in lime-clay mortar. Its structure combines Scottish-influenced design with local building traditions, most notably a system of horizontal timber seismic reinforcement incorporated within the masonry walls. Paired timber members run along both sides of the walls and are connected by transverse elements, helping to tie the masonry together and improve its resistance to seismic movement.
IVAN'S ROLE
Structural Engineer & Project Manager
Structural Survey
Assessment of foundations, masonry walls, timber reinforcement, floors, stairs, roof structure and roofing.
Engineering Diagnosis
Analysis of cracking, settlement, moisture-related deterioration and structural deformation.
Conservation Engineering
Development of masonry strengthening, timber repair and water-management measures.
Engineering Design
Preparation of defect surveys, work schedules and structural intervention drawings.
The project documentation identifies Ivan as Structural Engineer & Project Manager and as author of the engineering and design section
Assessment of foundations, masonry walls, timber reinforcement, floors, stairs, roof structure and roofing.
Engineering Diagnosis
Analysis of cracking, settlement, moisture-related deterioration and structural deformation.
Conservation Engineering
Development of masonry strengthening, timber repair and water-management measures.
Engineering Design
Preparation of defect surveys, work schedules and structural intervention drawings.
The project documentation identifies Ivan as Structural Engineer & Project Manager and as author of the engineering and design section
STRUCTURAL SURVEY
Recording the building before intervention
The structural survey was undertaken in November 2012 and included inspection of the foundations, walls, floors, stairs, roof framing and roofing.
The condition of the structural elements was assessed visually, supported by a foundation test pit and measured documentation of structural defects. The survey concluded that the majority of the principal load-bearing structures remained in generally satisfactory condition, while identifying a number of localised defects requiring intervention.
The condition of the structural elements was assessed visually, supported by a foundation test pit and measured documentation of structural defects. The survey concluded that the majority of the principal load-bearing structures remained in generally satisfactory condition, while identifying a number of localised defects requiring intervention.
KEY CONSERVATION CHALLENGES
Foundation Settlement
Localised deformation and approximately 6 cm of settlement affected the north-eastern corner of the house following prolonged leakage from water services.
Seismic Cracking
Cracks within the stone masonry joints were consistent with the effects of seismic activity in the region.
Moisture
Surface water and unsuitable ground levels contributed to dampness in the lower walls and biological growth.
Timber Deterioration
Parts of the traditional timber reinforcement had deteriorated, while timber door framing showed signs resembling termite damage.
Localised deformation and approximately 6 cm of settlement affected the north-eastern corner of the house following prolonged leakage from water services.
Seismic Cracking
Cracks within the stone masonry joints were consistent with the effects of seismic activity in the region.
Moisture
Surface water and unsuitable ground levels contributed to dampness in the lower walls and biological growth.
Timber Deterioration
Parts of the traditional timber reinforcement had deteriorated, while timber door framing showed signs resembling termite damage.
HISTORIC SEISMIC ENGINEERING
Traditional timber reinforcement within stone masonry
One of the most distinctive structural features of the Roerich House is its system of timber seismic reinforcement.
The load-bearing stone walls contain paired horizontal timber members positioned on both sides of the masonry and connected by transverse timbers. These occur at regular vertical intervals and help tie the masonry construction together.
The survey identified areas where earlier replacement timber had not been properly connected to the surviving historic elements, creating gaps and weakening the intended structural continuity.
This required a conservation approach that addressed structural performance while retaining as much historic timber as possible.
The load-bearing stone walls contain paired horizontal timber members positioned on both sides of the masonry and connected by transverse timbers. These occur at regular vertical intervals and help tie the masonry construction together.
The survey identified areas where earlier replacement timber had not been properly connected to the surviving historic elements, creating gaps and weakening the intended structural continuity.
This required a conservation approach that addressed structural performance while retaining as much historic timber as possible.
ENGINEERING DIAGNOSIS
Understanding the cause before designing the intervention
The survey went beyond recording visible defects and examined their underlying causes.
An earlier hypothesis had attributed cracking in the external walls to the cantilevered gallery. The structural assessment reconsidered this explanation by examining load magnitude, force direction and the observed pattern of deformation, and concluded that the gallery was not the principal cause of the wall damage.
An earlier hypothesis had attributed cracking in the external walls to the cantilevered gallery. The structural assessment reconsidered this explanation by examining load magnitude, force direction and the observed pattern of deformation, and concluded that the gallery was not the principal cause of the wall damage.
Cracking recorded during the structural survey
MOISTURE & GROUND CONDITIONS
Water as a structural conservation issue
The survey identified water as an important factor in the deterioration of the building.
At the east- and north-facing façades, rising ground levels reduced the effectiveness of the perimeter paving and encouraged moisture to remain against the walls. Elsewhere, vegetation and poorly configured external surfaces interfered with drainage. Previous leakage from building services had also contributed to local foundation settlement.
The project therefore treated water management as a structural conservation issue rather than simply a landscape problem.
At the east- and north-facing façades, rising ground levels reduced the effectiveness of the perimeter paving and encouraged moisture to remain against the walls. Elsewhere, vegetation and poorly configured external surfaces interfered with drainage. Previous leakage from building services had also contributed to local foundation settlement.
The project therefore treated water management as a structural conservation issue rather than simply a landscape problem.
TIMBER CONSERVATION
Retaining historic timber wherever possible
The survey recorded deterioration in parts of the timber reinforcement system and local biological damage to other timber elements.
The conservation proposals prioritised repair rather than wholesale replacement. Deteriorated elements were to be replaced only where necessary, with new timber carefully connected to the surviving historic structure.
Historic windows and doors were also to be retained and repaired wherever their condition allowed.
The conservation proposals prioritised repair rather than wholesale replacement. Deteriorated elements were to be replaced only where necessary, with new timber carefully connected to the surviving historic structure.
Historic windows and doors were also to be retained and repaired wherever their condition allowed.
MASONRY CONSERVATION & REINFORCEMENT
Strengthening weakened stone walls with limited intervention
Where cracking and internal voids affected the masonry, the project proposed targeted strengthening rather than rebuilding the walls.
The engineering solution combined grouting with ribbed fibreglass rods inserted through drilled holes in the masonry. Cracks and internal voids were then filled with a compatible injection mixture, improving structural continuity while retaining the existing stonework.
The engineering solution combined grouting with ribbed fibreglass rods inserted through drilled holes in the masonry. Cracks and internal voids were then filled with a compatible injection mixture, improving structural continuity while retaining the existing stonework.
Structural reinforcement detail for historic masonry
COORDINATED CONSERVATION DESIGN
Translating the survey into a programme of works
The survey findings were developed into a coordinated programme of structural and conservation interventions.
Masonry
Crack grouting and local reinforcement.
Timber
Repair and reconnection of deteriorated structural timber.
Water Management
Improved perimeter drainage and ground falls.
Roof
Inspection and repair of timber structures following removal of the existing covering.
Joinery
Conservation and local repair of historic windows and doors.
The project documentation included detailed work schedules for both floors, façade interventions, drainage works and masonry reinforcement.
Masonry
Crack grouting and local reinforcement.
Timber
Repair and reconnection of deteriorated structural timber.
Water Management
Improved perimeter drainage and ground falls.
Roof
Inspection and repair of timber structures following removal of the existing covering.
Joinery
Conservation and local repair of historic windows and doors.
The project documentation included detailed work schedules for both floors, façade interventions, drainage works and masonry reinforcement.
Conservation work plan — first floor
Conservation work plan — second floor
Engineering interventions — west façade
Conservation work plan — second floor
Engineering interventions — west façade
SURFACE WATER STRATEGY
Designing drainage around a sensitive historic site
A dedicated drainage strategy was developed to direct surface water away from the historic masonry.
The proposals included new open drainage channels, regrading of external surfaces and paths, and stone paving laid to controlled falls around the building. The design responded to both the existing terrain and runoff arriving from higher ground.
The proposals included new open drainage channels, regrading of external surfaces and paths, and stone paving laid to controlled falls around the building. The design responded to both the existing terrain and runoff arriving from higher ground.
ROOF & UPPER STRUCTURES
Repair guided by inspection
The roof structure was generally considered serviceable, but repeated repairs and evidence of leakage required further investigation.
The design proposed removing the existing roofing in controlled stages beneath temporary protection. This would allow rafters, wall plates and the bearing ends of attic beams to be inspected directly, with timber repaired or replaced only where deterioration was confirmed.
A new metal roof covering of the same general type was then proposed, together with careful detailing around chimneys and restoration of the missing lightning protection.
The design proposed removing the existing roofing in controlled stages beneath temporary protection. This would allow rafters, wall plates and the bearing ends of attic beams to be inspected directly, with timber repaired or replaced only where deterioration was confirmed.
A new metal roof covering of the same general type was then proposed, together with careful detailing around chimneys and restoration of the missing lightning protection.
CONSERVATION PRINCIPLE
Repair first - replace only where necessary
The project followed a conservation-led approach based on retaining serviceable historic fabric and intervening only where deterioration or structural weakness required it.
Historic masonry was to be repaired rather than rebuilt, surviving timber retained where viable, incompatible cement repairs removed, and new materials introduced in a manner compatible with the existing construction.
Historic masonry was to be repaired rather than rebuilt, surviving timber retained where viable, incompatible cement repairs removed, and new materials introduced in a manner compatible with the existing construction.
PROJECT SUMMARY
1880
House constructed
2012
Structural survey
2013
Conservation engineering design
Naggar, India
Himachal Pradesh
Ivan's role
Structural Engineer & Project Manager
Project scope
Survey · Diagnosis · Structural Design · Conservation Engineering
House constructed
2012
Structural survey
2013
Conservation engineering design
Naggar, India
Himachal Pradesh
Ivan's role
Structural Engineer & Project Manager
Project scope
Survey · Diagnosis · Structural Design · Conservation Engineering
CONSERVATION OUTCOME
The Roerich Estate project combined detailed structural investigation with a conservation engineering strategy adapted to the building’s historic construction, Himalayan environment and seismic context.
The resulting proposals addressed masonry stability, traditional timber reinforcement, moisture and drainage, roof performance and the conservation of surviving historic fabric as parts of a single coordinated system.
The resulting proposals addressed masonry stability, traditional timber reinforcement, moisture and drainage, roof performance and the conservation of surviving historic fabric as parts of a single coordinated system.
Discuss a Conservation Project
Ivan is available for independent consultancy, technical review and professional collaboration on historic structures, conservation engineering and structural assessment.
CONTACT IVAN →
CONTACT IVAN →
