Choosing a roofing contractor to plan and carry out the work

A crew that lays modular tile-effect metal roofing efficiently does not necessarily have the same experience with every standing-seam system. The substrate, fixing and flashings differ. A roof with many valleys and dormers calls for different organisational skills than a simple roof slope on a carport. Ask about similar jobs.

Ask to see the details, not just photographs of the whole building. The terminations at walls, chimneys and the eaves matter. With the owner’s consent, an earlier project can be viewed from a safe position. It is worth asking how the cooperation went after handover and whether the contractor responded to comments raised.

Before the conversation, prepare a roof plan, sections and information about the planned covering. A reliable quote requires data on the geometry, the layers and the special locations. For a renovation, an assessment of the existing structure is needed. A rate given without any questions can only be a preliminary indication.

A good test is a conversation about a specific detail. Ask how water will be drained at the chimney or how the eaves will be ventilated. The answer should match the instructions for the chosen product. The contractor may point out a missing design decision; pretending that every problem can be solved by eye is not an advantage.

Two amounts per square metre of roof may cover different works. One quote includes the flashings, another only the laying of the sheets. Scaffolding, dismantling, substrate repair, gutters and waste removal are sometimes priced separately. The comparison should list quantities and the method of measurement, and state whether the prices are net or gross.

Agree how additional works revealed after the old covering is removed are settled. The scope of repairs cannot always be predicted precisely, but the way they are approved can be agreed. When comparing quotes, ask for gaps to be filled in. The lowest total is not yet a saving if it omits necessary items.

Tile-effect metal roofing cut to size requires a correct schedule of lengths. It must be established who takes the measurement, who approves the order and who checks the delivery. With modules, too, a plan and a quantity that takes account of the roof slope geometry are needed. A small format does not remove the risk of an incorrect order.

Ask about the storage location and how the material will be moved. Long sheets may require a suitable number of people or equipment. Delivery much earlier than installation only makes sense under the right storage conditions. It is also worth agreeing on checks for transport damage and how to deal with a wet pack.

The schedule should take account of the weather, deliveries and the sequence of other works. When renovating an occupied house, protecting the interior after the covering is removed is important. Good organisation does not consist of a promise to work regardless of conditions. The crew should know how to pause a stage and cover the open section of the roof.

Safe access, fall protection and proper lifting of material are part of the execution. It is not worth rewarding shortcuts at the expense of these measures. Also agree a contact for the person managing the works and the way changes are reported. When different people make decisions, conflicting arrangements are easily made.

A finished roof does not show the condition of the membrane, the connections of the structure or the arrangement of all the fixings. It is therefore worth agreeing inspection stages. The substrate and the initial covering are assessed before the metal is installed. Details susceptible to leaks require close-ups and documentation, not just a general photograph from the yard.

A doubtful solution can be discussed with the designer or the person supervising before it is covered. Photographs help, but they do not replace an assessment on site. The final inspection also checks the cleanliness of the roof slope, water drainage and the completeness of the accessories. Swarf left on the metal can later cause rusty marks.

Keep the material specification, the user instructions and a record of the changes made. It is also worth having documentation of the covered locations and a handover report with comments. Such a set makes a future inspection, the installation of equipment or a repair easier. An oral statement does not describe precisely what was actually installed.

The warranty on the material must be distinguished from the arrangements concerning the workmanship. Ask about the scope, the conditions and how a problem is reported. The number of years alone does not explain what is covered. A good end to the cooperation is also information on inspections and cleaning, matched to the roof and the coating used.

Send the same documentation to every crew and ask for the same breakdown of costs. Mark the flashings, gutters, roof access and the works after dismantling. Only once the scope has been standardised does the difference in price show the real difference between the quotes.

Choosing a roofer begins with checking similar work and a conversation about your own project. A clear quote, established responsibility and stage-by-stage inspections make for good cooperation. It is worth looking for a contractor who can explain their solutions and document them.