Exterior sealant can contribute to water intrusion when a weather-seal joint no longer performs as intended, but visible cracking alone does not establish the complete leak path. A useful assessment connects the interior complaint to the exterior assembly, identifies the affected joints and specifies compatible repair work.
This guide addresses weather-sealing around commercial building interfaces. It does not treat structural glazing adhesives or firestop systems as interchangeable with exterior weather sealants. Those functions require their own qualified review.
Describe the joint condition accurately
From a safe, accessible position, photograph the affected wall or window area and identify the location. Preserve both an overview and a closer view when practical. Record whether the concern is a new opening, a repeat leak or a condition identified during another inspection.
Sika's weather-sealant guidance explains that joint dimensions, substrate preparation, compatibility and application conditions affect performance. It distinguishes failure within the sealant from loss of adhesion at the adjoining material. These considerations support asking why a joint failed rather than specifying only a new bead of caulk.
| Observed concern | What the provider should clarify |
|---|---|
| Separation at an edge | Condition of the sealant bond and the adjacent surface. |
| Crack or split through the joint | Whether the joint design, movement or material condition needs review. |
| Several layers of earlier material | What must be removed and how the substrate will be evaluated. |
| Interior water near the same area | Whether the joint is the entry point or one part of a wider enclosure issue. |
Connect the joint to the building's water path
Give the investigator the first-observed time, rain conditions, interior location and past repair records. A recurring complaint at one elevation may narrow the review, but it should not become a diagnosis before the surrounding assembly is considered.
Ask whether the investigation includes relevant adjacent interfaces and whether suitable testing is needed. Do not direct maintenance staff to spray the facade or seal openings as an informal test. The provider should determine a controlled method that fits the assembly and protects occupied interiors.
Our commercial water-intrusion source guide explains why roofs, wall transitions, openings and other systems may need to be considered together. This avoids repeatedly repairing the most visible joint while an unconfirmed source remains elsewhere.
What should a sealant repair proposal include?
Ask for marked elevations or a location schedule that shows exactly which joints are included. “Reseal building” is too vague to compare against a proposal covering a few localized repairs. State whether access equipment, tenant coordination and finish touch-up are included or separate.
- Locations, approximate extent and the reason each area is included.
- Removal and preparation of existing materials and adjoining surfaces.
- Proposed product and confirmation of suitability for the actual substrates.
- Any joint-detail correction, testing or specialist review required.
- Access restrictions, weather dependencies and completion records.
Sika's guide also calls for attention to material compatibility, surface condition and adhesion checks. Its requirements are product-specific; a repair provider should use the current instructions for the selected system. Do not substitute one manufacturer's dimensions or preparation method for another product's requirements.
Plan the work around weather and occupants
Use a dry forecast interval to arrange access and approved work, while leaving material-condition and application decisions to the provider. A sunny afternoon does not by itself confirm that a previously wet joint is ready for repair.
Coordinate windows, entrances and work areas with tenants. Ask how the work area will be separated, who will communicate restrictions and what happens if further damage is found after existing materials are removed. Keep interior restoration tied to source correction and any required moisture assessment.
Brady can discuss commercial water-intrusion repair and related facility inspection needs in Ontario. For symptoms that occur only in certain storms, review the heavy- and wind-driven-rain investigation guide.
Common questions
Can new sealant be applied directly over old sealant?
Do not assume so. The repair scope should address existing material condition, preparation, compatibility and the selected manufacturer's requirements.
Does exterior cracking always mean water is entering?
No. It is a condition to assess. The investigation should establish the joint's function, the defect and its relationship to any reported leak.
Should the whole facade be resealed after one leak?
That requires evidence about the wider joint condition. Request a clearly defined inspection and an explanation of why localized or broader work is recommended.
Can a regular weather sealant repair address structural glazing?
Do not treat those scopes as interchangeable. The provider must identify the joint's function and involve the appropriate specialist when structural glazing is involved.
Request assessment of exterior joints and water intrusion or call 909-293-9861. Include photographs, locations and earlier repair reports.