This document was prepared two years before  DFO actually did the upgrading of the light tower. The following quotes on the historic significance is worth noting.

EXECUTIVE SUMMARY Background

The Heritage Conservation Network (HCN) project team has completed the condition assessment and report for the Race Rocks Lighthouse located on Great Race Island in the Juan de Fuca Strait, south of Victoria, British Columbia, as part of the project for eighteen lighthouses for the Department of Fisheries and Oceans (DFO). The report contains structural and building envelope conditions, analysis of these conditions, recommendations and indicative cost estimates for mandatory and cyclical conservation work both in the short and the long term.

See the Full PDF at :Condition Assessment

Conservation Approach

This condition assessment, report and related recommendations, follow the conservation approach of minimal intervention and least harm to preserve/protect heritage character. This approach will help provide DFO with information required to properly manage the Race Rocks lighthouse while ensuring that the building is safe in terms of both public and staff and that the existing heritage fabric will be protected and maintained.

Description

The Race Rocks Lighthouse is a pitched-face stone structure with a round, tapered shaft, painted with a series of horizontal black and white painted stripes. The tower corbels at the top forming a gallery around the cast iron lantern, which rises approximately 32 meters (105′-0″) tall from grade, and tapers from a diameter of approximately 5.8 meters at its base to 3.8 meters at its narrowest point below the gallery. The tower is accessible through a curved metalic stair and arched door opening, located 3.20 meters (10’6″) above grade. It is pierced with 4 window openings, the two lowest of which are arched and the top two, rectangular. The cast iron octagonal lantern, which sits atop the concrete parapet, can be reached by a continuous stone spiral staircase, which terminates just below it.

Heritage Value

The Race Rocks Lighthouse is a Recognized federal heritage building (FHBRO log number 90-85). It obtained a total score of 62, based on a score of 14 for historical associations, 23 for architecture, and 25 for environment. A review of the related Heritage Character Statement is provided in the report to help the lighthouse custodians identify and protect heritage fabric and aid in guiding future maintenance and repair interventions so as to maintain the lighthouse’s heritage value. This section identifies all of the elements of the lighthouse that are important in defining the overall heritage values that require protection. Its character-defining elements reside in its robust stonework construction consisting of large rusticated blocks with limited decorative detailing, typical of “Imperial” lighthouse design, in its black and white day marking and in the interior spiral stone stairway. Other buildings on the islands are considered to contribute to the heritage character of the tower’s environment, but were not investigated for this report.

PWGSC, P&TSM, Heritage Conservation Network 1

Race Rocks Lighthouse Condition Assessment Reports Victoria, British Columbia Including Indicative Cost Estimate

Methodology

Background and historical documentation were consulted both before and after the on-site investigation. This included a review of documents related to environmental site assessments in the preparation of the Site Specific Safety Plan prior to the site visit. The on-site investigation consisted of a preliminary site orientation by the team members to gain a general understanding of the building and its surroundings. Detailed visual and tactile investigations were then carried out on both the exterior and interior of the lighthouse. All investigations were non-destructive by nature and any samples were gathered from loose or fallen materials.

Assessment

Building Structure:
Overall, the stone walls from the foundations to the top of the tower were found to be in fair to poor condition. Although there are no signs of displacements or structural instability, extensive damage was observed. Two large vertical cracks extend vertically from the base of the tower to a height of approximately 10 meters and will require mapping and monitoring. Deterioration of the stone also included delamination and salt formation, mostly visible on the interior walls, at the top of the tower, corresponding to exterior areas that were covered in “gunite” several decades ago. Water appears to be trapped in the walls at that level and the stone masonry will require rapid treatment in the affected area to limit further decay. Extensive cleaning, repointing and renewal of the impervious coating will also be required throughout.

Lantern and Gallery:
Deferred maintenance of the lantern and gallery has lead to deterioration of surfaces, with paint chipping and corrosion of the cast iron lantern and paint failure and concrete spalling of the underlying parapet. The gallery also shows traces of surface deterioration, with decayed paint and a failing membrane.

Building Envelope:
With the exception of an opening obstructed with fog-detection equipment, windows and the access door were found to be in good condition overall. The main recommendation with regards to the building envelope concerns the improvement of ventilation and heating levels to help resolve the stone deterioration on the interior face of the walls. Ventilation may for instance be provided through the windows and door openings.

Other Building Elements:
The exterior stair is a recent addition to the structure and is in good condition overall. It may warrant replacement in the future for reasons of code compliance and enhancement of the structure’s heritage character.

2 PWGSC, P&TSM, Heritage Conservation Network

Race Rocks Lighthouse Condition Assessment Reports Victoria, British Columbia Including Indicative Cost Estimate

Recommendations

The principal recommendations for this condition assessment would include:

• Examine and monitor the two vertical cracks at the base of the tower for a minimum of 1-2 years to verify if they are still active and identify their cause(s).
• Remove the “gunite” coating from the top of the exterior walls using an appropriate method.
• Clean, repair and repoint the stone on both interior and exterior faces of the tower.
• Remove all paint on the interior of the tower, using an appropriate non-abrasive method.
• Replace the existing impervious coating with a coating that allows circulation of water vapour and repaint the existing daymarking.
• Remove and repair the cast iron lantern (workshop conservation).
• Repair of the top of the parapet, at the base of the lantern.
• Provision of additional ventilation and heating inside the tower.
• Implement regular maintenance activities. A detailed list of recommendations, identifying the recommended short- or long-term time frame is provided by building element in Section 4.0 and by type (mandatory, cyclical, investigation). Further investigation into building elements that were not accessible, research, and monitoring of conditions will also be an important future activity.

  Cost Estimates

  The estimated cost for all recommended mandatory and cyclical work for the next twenty-five (25) years is $3,503,600. The corresponding Net Present Value (NPV) is $1,782,000.

  This amount corresponds to the sum (in NPV) of the mandatory generally short-term work $598,000, the cyclical generally long-term work $653,000 while also providing an allowance of $76,000 for further essential investigation, monitoring, and research, and $455,000 for overall fees, administration, etc.

  The cost estimates for a Five Year Operating and Maintenance Plan, as provided by DFO, are included in Appendix J.