C r e n s h a w C o n s u l t i n g G r o u p
is a design/engineering and consulting firm specializing in roofing,
water-proofing, and exterior building envelopes.
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Design & Engineering ◘ Specializing in complex site specific plans and specifications for new construction, re-roofing, renovation, repair, and maintenance projects.
Our design and engineering services start with initial project investigation and scoping to determine pre-existing conditions. We then provide options for either repair or replacement. The best options for a long term, sustainable solution are selected based on cost and durability. The next step is to provide a comprehensive set of design documents including CADD drawings, and specification manual. These documents will be used to procure a construction contractor and maintain Quality Control. Our services continue through the final construction close-out, helping to assure you, the client, that your investment is safe and secure for many years.
Quality Assurance ◘ Quality assurance observation of roofing projects is an important process for determining if the removal, installation, repair, or maintenance of roofing materials or systems follows the scope and intent of the Contract Documents, and are installed and executed in accordance with accepted roofing practices and the Contract Documents. This practice is applied to full-time quality assurance observation of roofing projects involving the removal, construction, and repair and maintenance of low- and steep-slope roof systems and roofing-related accessories.
Forensics Investigation ◘ Identifying the source of water leakage and moisture infiltration is the first step in the remediation of moisture damaged buildings. Roof and exterior envelope investigation services help identify whether the products were installed properly, the products have not prematurely failed, and then define a remediation process.
Forensic services focus on the physical problems of the total exterior envelope related to design & construction defects, material defects, building envelope failures, moisture intrusion, excess humidity, HVAC and plumbing failures, ventilation inadequacies, and natural disasters. Forensic analysis is a useful tool at any phase of a buildings life.
Non-Destructive Surveys ◘ The decision of whether to remove or re-cover an existing roof is critical because of the significant cost differential between roof removal and replacement (tear-off) and roof recovery. Although re-covering an existing roof system is less costly, there is a risk that moisture trapped within the original system, especially in the insulation, will have a negative effect on the overall roof assembly. Moisture contained in the insulation of the original roof system that is re-covered often leads to corrosion of fasteners and steel roof decks and may cause spalling damage to concrete decks. Furthermore, trapped moisture can cause structural damage to other types of roof decks (e.g., wood, gypsum, cementitious wood fiber.) The same goes for wall systems. Determining weakness in the exterior moisture protection will help the long term performance of the building.
Storm Damage Evaluation ◘ Severe storm events test the best of our products and materials in modern construction. While every modern building was constructed to code to survive major storm events and protect life and safety, the violence and unpredictable nature of storms will cause a variety of failures. Some types of failures are obvious, such as shattered windows from flying debris. Others are more subtle and require a systematic approach to investigation of storm related damage. Uplift pressures that exceed design values can tear a roof membrane off its substrate and leave it looking intact, with potential leaks revealing themselves long after the event. Water pressure differential can draw water into a wall system causing structural damage due to rust and rot or health problems related to mold and mildew.
Laboratory Testing & Analysis ◘ Lab analysis of test samples taken from the field help identify the condition of an existing roof. Installation procedures such as head lap joints, ply/configuration, attachment methods, flood coat thickness, inter-ply bitumen, all can be identified in standardized testing to help identify the condition of a roof system or source of potential failures. This type of information can be used to determined types of failures due to improper installation or sever storm events. Hidden conditions such as inter-ply fractures, surface displacement, material failure, improper installation, and incomplete installation will all come to light in our labs, helping to determine a cause of failure or to find the reason for a persistent leaking problem.