Roof inspection is a crucial step after construction is complete, allowing the developer to ensure that the structure is safe, watertight, and in accordance with the building’s design. Checking the quality of the work prevents costly repairs in the future. If you have any questions, we’d be happy to advise you on which elements require special attention.
In this post, you’ll learn about the most common problems:
The “Investor’s Guide” series is a practical compendium of knowledge on the investor–contractor relationship. The articles guide readers through the entire construction process—from thorough preparation for the first meeting, through a detailed analysis of cost estimates, to a substantive technical inspection. The series clarifies the division of responsibilities on the construction site, defining the scope of a roofer’s work and the standards for project documentation. Effective communication is key—the guide teaches you how to ask the right questions at every stage of the project to avoid misunderstandings and unforeseen expenses. Together, this guide enables you to build a roof based on mutual trust, clear guidelines, and the highest quality of workmanship.
In this article, you’ll learn what you can expect from a roofer during the roof inspection after the work is completed, and what to pay special attention to before signing the inspection report. A roof should not only be aesthetically pleasing, but above all, watertight, safe, and in compliance with the design and best roofing practices. The inspection involves both evaluating the quality of workmanship and verifying the documentation, Warranties, and the proper finishing of details. It’s therefore important to know which elements to inspect, which documents to obtain from the contractor, and how to document any defects to avoid problems and costly repairs in the future.
Roof acceptance is a formal and technical process that involves verifying whether the roof was constructed in accordance with the design, best construction practices, and applicable regulations. It is one of many stages in the building acceptance process. Upon completion of the work, the contractor notifies the client that the roof is ready for acceptance, and the client is often represented by a client supervision inspector—provided the client has decided to appoint one, which is not mandatory for every construction project. The construction manager, on the other hand, represents the contractor and is responsible for ensuring that the work complies with the design and regulations.
The roof inspection itself involves a detailed examination of all layers—from the roof framing structure, through the insulation, to the roof coverings and associated systems. A roof is a layered and fairly complex structure, and the work involved in its construction is eventually covered up; therefore, many elements must be checked during the construction process.
During roof construction, there are many tasks that must be inspected and approved by the construction manager and the client’s supervision inspector. These include details such as: thoroughly debarked and treated structural lumber, formwork, the correct roof pitch, and the cross-sections and lengths of corner and valley rafters. It is also important to verify which fasteners were used to assemble the roof structure. This ensures that the final roof inspection will not reveal any serious defects. It is particularly important to check the weatherproofing of the roof sheathing, the attic insulation and ventilation, and the assembly of flashings. You should also remember to check whether any roof hatches and roof windows have been properly installed on the roof.
Before signing the roof acceptance documents, check all structural elements and the roofing material from both the inside and outside of the building.
The most important thing is to inspect the roof coverings—tiles, roofing metal sheets, or roofing felt—for cracks, damage, missing sections, or corrosion. The inspection of the roofing should also include details such as flashings, which ensure watertightness in critical areas of the roof.
It is crucial to check the integrity of the roofing, the patency of the gutter system, and the proper insulation and ventilation of the roof deck. This helps prevent leaks and water seepage inside the attic. Water tightness is verified in several ways. A visual inspection after rain is the basic method, but it is not very accurate. A professional method is testing with a thermal imaging camera—it detects areas of heat loss and moisture in the insulation without having to damage the roof covering. A blumeter (moisture meter) is also used to test the moisture content of the insulation layers. If there are any doubts about the airtightness, it is advisable to commission such a test before signing the acceptance report—this allows for the detection of any potential leaks before they cause costly damage to the insulation or the structure.
You should also check:
Ventilation is essential—a lack of space between the membrane and the roofing material leads to moisture buildup in the insulation and a reduction in the roof structure’s durability.
Upon completion of the construction work, the contractor is required to provide the client with a complete set of documents confirming the quality of the roof’s construction and the materials used.
The most important of these are:
These documents are particularly useful in the event of complaints or future roof repairs. Without them, it may be difficult to pursue claims against the contractor.
As-built documentation is a detailed description of the work performed and the materials used. It is essential for the investor and the construction manager.
It should include:
Well-prepared documentation makes it easier to carry out future repairs, inspect the condition of the roof, and assess any potential defects.
The roof acceptance report serves as protection for the investor in the event of future defects. It is the most important document concluding the acceptance process.
It should include:
This document serves as the basis for filing claims in the event of leaks, water damage, or other problems in the future.
A warranty is a voluntary commitment by a contractor or materials manufacturer to remedy defects within a specified period. A warranty arises from statutory provisions and protects the investor regardless of the terms of the contract. Pursuant to Article 568 of the Civil Code, the warranty for defects in construction work lasts 5 years from the date of acceptance—during this time, the investor may demand that defects be remedied, that the price be reduced, or that the contract be rescinded, even if the contractor has not provided any Warranty.
In practice, the roof inspection should take both mechanisms into account, since the roof, as a component of the building, is subject to heavy use and damage. Before selecting a roofing material, you should carefully review the Warranty terms offered by manufacturers.
Warranty terms vary significantly among manufacturers and depend primarily on the type of coating and the Assembly system. For example, some manufacturers—such as the Blachy Pruszyński Company—offer warranties of up to 50 years on select products with premium coatings. Before choosing a material, you should always read the Warranty certificate carefully and check what obligations it imposes on the investor to ensure the Warranty does not expire prematurely.
During construction, various problems may arise due to design errors, construction defects, or poor-quality materials.
The most common problems are:
Many problems stem not from the roofing itself, but from errors in insulation and finishing work. Regular inspections during construction help reduce the risk of serious problems and improve the building’s safety.
The acceptance documentation should be as detailed as possible. It is a good idea to document the roof acceptance with photos, videos, and a written report.
Drones are increasingly being used to conduct thorough roof inspections. Inspecting a roof with a drone helps detect leaks, damage to systems, and problems with insulation and Ventilation. Drones equipped with thermal imaging cameras identify areas of heat loss and moisture.
The use of drones improves the safety and accuracy of inspections and also allows for the creation of 3D models of the roof, which is particularly useful for planning renovations and monitoring its condition in the future.
Roof inspection is one of the most important stages of building construction. Thoroughly checking all components helps avoid costly repairs and ensures the structure’s durability.
Key items to check:
Roof acceptance is the final verification of the quality of workmanship, but its outcome is largely determined by earlier decisions. It is crucial to select an experienced roofing crew, a competent construction manager or inspector, and materials with verified specifications. Mistakes at this stage directly affect the final result of the construction project. A knowledgeable investor minimizes risk as early as the planning stage, rather than waiting until the inspection.
Yes—the roof inspection is part of the mandatory building inspection required by the Construction Law. The construction manager is required to report that the project is ready for inspection, and the developer should confirm the completion of the work with an inspection report. Without this document, it is difficult to pursue claims under a warranty or guarantee.
Pursuant to Article 568 of the Civil Code, the warranty for defects in construction work is valid for 5 years from the date of acceptance. This means that during this period, the client may demand that the contractor remedy defects, reduce the compensation, or—in extreme cases—terminate the contract. The Warranty applies regardless of whether the contractor has provided a Warranty.
First, you should report defects in writing—preferably by certified mail—citing the acceptance report and the deadline for rectifying the defects specified therein. If the contractor fails to respond, the investor has the right to have the repairs performed by another entity at the original contractor’s expense (known as “substitute performance”) and to seek reimbursement of costs through civil proceedings. The basis for this is the signed acceptance report listing the defects.
The contractor should provide: a roof acceptance report, warranty cards for the materials and roofing used, a statement from the site manager confirming that the work complies with the design, as-built documentation including drawings and a description of materials, and instructions for the use and maintenance of the roof. The absence of any of these documents complicates subsequent claims and repairs.
Without specialized equipment, the best method is to conduct a thorough visual inspection of the attic after heavy rain—look for water streaks, moisture stains, and signs of mold on the rafters and sheathing. It’s also a good idea to check the condition of the vapor-permeable membrane from the inside. However, visual methods have limited effectiveness—professional diagnostics using a thermal imaging camera or a moisture detector can detect potential leaks and moisture in the insulation long before they become visible to the naked eye.
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