Building Envelope Remediation & Rehabilitation
When a building envelope system has reached the end of its service life, or when recurring water ingress has demonstrated that targeted repairs are no longer sufficient, a more comprehensive response is warranted. Building envelope remediation covers the repair or replacement of deteriorated exterior systems – cladding, roofing, windows, balcony waterproofing, and below-grade assemblies. Rehabilitation goes further: it addresses not only what has failed, but improves the performance of the assembly as a whole – adding insulation, improving air barrier continuity, upgrading drainage, and bringing systems closer to current energy and moisture management standards.
In practice, remediation and rehabilitation often converge. A recladding project is an opportunity to improve the wall assembly's thermal performance. A window replacement program can be designed around current energy targets rather than the original specification. A roof replacement can incorporate significantly improved insulation that was not feasible without taking the roof down. DG Engineering provides full-service consulting for remediation and rehabilitation projects for strata corporations, property managers, and building owners across the Lower Mainland, Sea to Sky corridor, and Sunshine Coast.
Full-Service Project Consulting
A full-service engagement covers the complete project lifecycle from initial scoping through construction completion:
Assessment and scoping – confirming the extent of deterioration, defining the scope of remedial or rehabilitative work, and identifying which systems can be retained versus those requiring replacement. This stage may build on an existing building envelope condition assessment or may be carried out as the first step of the engagement.
Design – developing a remediation or rehabilitation strategy appropriate to the building type, construction era, and performance objectives. For rehabilitation work, this includes improving thermal continuity, drainage plane performance, and air barrier integrity alongside or in lieu of like-for-like replacement.
Specification – preparing contract documents that define materials, installation standards, and performance expectations in sufficient detail to support competitive tendering and quality oversight during construction.
Tender – managing the competitive tender process on a CCDC-2 Stipulated Price Contract basis, evaluating contractor submissions on a consistent and comparable basis, and assisting the owner with contractor selection.
Contract administration and construction support – acting as the Consultant under the CCDC-2 contract, administering the construction contract on behalf of the owner throughout the construction period. This includes reviewing contractor submittals, responding to requests for information, issuing site instructions, and managing changes to the work. As Payment Certifier, we review the contractor's applications for payment and certify amounts for release to the owner, and issue certificates of substantial performance and final completion.
Field reviews – carrying out periodic site visits at key stages of construction to observe work and confirm it proceeds generally in accordance with the contract documents.
Rehabilitation and Performance Improvement
Where remediation restores a building to a functional state, rehabilitation improves it. A major recladding project, for example, is an opportunity to redesign the wall assembly for better long-term performance: improving the drainage plane, adding continuous exterior insulation to reduce thermal bridging, and detailing the air barrier to a higher standard. These improvements may not be practical in isolation, but they make clear sense when the cladding is already coming off.
Similar opportunities arise with other envelope systems. Window replacement programs can incorporate higher-performing glazing and frame systems that reduce heat loss. Roof replacements can add meaningful insulation where headroom or structural capacity allows. Balcony assemblies can be redesigned to better manage thermal bridging at guardrail connections and slab edges.
Our team's background in new construction consulting – where thermal performance, energy compliance, and envelope detailing are integral to the design process – directly informs how we approach rehabilitation work. We bring that perspective to older buildings, and we understand what past design decisions have led to and how to avoid repeating them.
Common Project Scopes
Our team has experience across the full range of remediation and rehabilitation work common to the Lower Mainland building stock:
Cladding replacement and recladding – removal of deteriorated cladding systems and installation of new assemblies, including rainscreen systems with continuous exterior insulation where rehabilitation objectives are included
Window and glazing replacement – full replacement of window and door assemblies, including associated flashing details, transitions to the wall assembly, and performance-based glazing selection where applicable
Balcony and deck waterproofing – replacement of deteriorated balcony membranes, drains, and guardrail connections, with attention to thermal bridging at slab edges where rehabilitation scope warrants
Roof replacement and improvement – specification and oversight of membrane replacement, including insulation upgrades where structurally and geometrically feasible
Parkade and below-grade waterproofing – repair and replacement of below-grade waterproofing systems and traffic membranes
Why DG Engineering
Remediation and rehabilitation is where our assessment work and our design work converge. The same team that identifies deficiencies in a building envelope condition assessment designs and specifies the scope that follows. That continuity means our specifications are grounded in what we observed, and our contract administration is carried out by engineers who know the design intent.
As Consultant and Payment Certifier under the CCDC-2 contract, we represent the owner's interests throughout construction – certifying work that meets the contract documents and protecting the owner's position when it does not. Owners benefit from having a single team accountable from assessment through project close-out, without handoffs between stages.
We work with strata corporations, property managers, and building owners across Vancouver, the North Shore, Burnaby, Metro Vancouver, the Sea to Sky corridor, and the Sunshine Coast.
Frequently Asked Questions
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Remediation focuses on restoring a building envelope system that has failed or deteriorated – replacing what is worn out, arresting water ingress, and bringing the building back to a functional, weathertight state. Rehabilitation goes further by improving the performance of the assembly beyond its original design: better insulation, improved drainage, higher-performing systems. In practice, many projects involve both – a recladding is also an opportunity to improve thermal performance, and the two objectives are often pursued together.
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Contract administration is the management of the construction contract – between the owner and the contractor – on behalf of the owner once a contractor has been selected. Acting as the Consultant under a CCDC-2 Stipulated Price Contract, we respond to the contractor's requests for information, review and approve submittals, issue instructions for changes to the work, and carry out field reviews to confirm work proceeds in accordance with the contract documents. As Payment Certifier, we review the contractor's payment applications and certify amounts for release, and issue the certificates of substantial performance and final completion. This role protects the owner's interests and ensures the contractor is held accountable to the contract documents throughout construction.
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We provide engineering consulting only – design, specification, tender management, contract administration, and field reviews. All remediation and rehabilitation work is carried out by qualified contractors selected through a competitive tender process we manage on the owner's behalf.
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Phasing is often possible and may align with reserve fund cycles or budget constraints. However, it may increase total project cost: each phase typically carries its own mobilization and demobilization expenses, material and labour costs tend to escalate between phases, deferred systems continue to deteriorate and may require interim protection, and occupants experience repeated construction disruption rather than a single concentrated period. We can advise on phasing during the scoping process and on which systems can be deferred without meaningfully increasing risk or cost – and whether strata financing might allow the full scope to proceed at once at lower overall cost.
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Yes. Where a building permit is required – as is typical for cladding replacement and window replacement – we prepare the technical documentation required by the authority having jurisdiction, including drawings and specifications submitted on behalf of the owner.