Metal roof tiles or clay tiles for a reroof: comparing two estimates
Metal roofing
At a glance
When replacing a roof, start with the existing building. The price of sheets or tiles accounts for only part of the work. Inspect the structure, the layers beneath the covering and the cost of completing the details. Two comparable estimates describe the same roof and scope. Check the roof frame, connections and supports. Establish whether the rooms below will be heated. A change in the use of the attic may require different insulation and ventilation. Replacing the outer covering alone leaves defects within the roof build-up unresolved.
Assess what remains after stripping the roof
Price stripping, waste removal, structural repairs and new layers separately. Removing the covering may reveal hidden damage. Agree how the contractor will document and price it. Base the contingency on the risks identified and define the contractual scope after inspection.
For phased work, include temporary weather protection. Agree how much roof can be opened at once and who protects the interior. Include the cost of these arrangements in both estimates.
Compare loads on the whole roof
Metal roof tiles generally weigh less than clay tiles, but compare the actual products. If one covering weighs 5 kg/m² and the other 45 kg/m², their weights on 106 m² are 530 kg and 4,770 kg respectively. This calculation covers only the roof covering and excludes battens and other components.
Have the structure and loads assessed before choosing the heavier system. The house’s age and the appearance of rafters viewed from below do not establish capacity. Damaged members may need repair even with a light covering. Snow, wind and the weight of the complete build-up still count. Multiplying the covering weight by area is only a materials calculation.
Use one schedule of work for both estimates
Define the same limits for both schedules. Include eaves, ridge, valleys, chimneys, service penetrations and roof access equipment. Add drainage, ventilation and any required snow retention. An omitted item can make one estimate appear cheaper.
Compare complete systems, including metal flashings. Check the pricing unit too. Steel sheets may be priced by overall or effective cover area. Clay tiles may be quoted per piece, then converted to a square-metre figure. Both systems need a layout or cutting plan for the actual slopes.
Match the format to the roof shape
A simple gable roof differs from a slope interrupted by several valleys. Long sheets reduce laps but need suitable transport and careful handling. Small modules allow staged deliveries. A clay tile layout must also allow for edge units and cuts.
Ask for both the order quantity and the area derived from the measured roof. The difference should be explained. A universal waste percentage cannot suit every roof shape. Check which offcuts can be reused: their profile direction, joint and edge condition determine their suitability.
Assess comfort from inside the room
Rain noise depends on the complete roof. Insulation, airtightness, linings and connections to the structure all influence what occupants hear. Tapping two loose samples says little about the sound in a finished attic bedroom.
The same applies to temperature. Roof colour and surface finish are only part of the picture. Insulation, roof ventilation and window shading also affect comfort. Use the refurbishment to address weak spots throughout the assembly. A more expensive outer layer cannot correct air leaks along the slopes or missing insulation at the wall plate.
Check maintenance requirements
Ask about inspections, chimney access and replacing damaged units. With metal sheets, check the coating, edges and compatibility of repair materials. With clay tiles, consider whether a single tile can be replaced and the correct shape obtained. Flashings need checking on both systems.
Read the warranty coverage and the owner’s maintenance duties. A warranty period still requires the specified upkeep. Keep the specification, colour and installation records. Compare the cost of complete, correctly built assemblies when making the final decision.
Questions and answers
Can a lightweight metal covering dispense with a structural assessment?
No. A damaged structure may need repair under any covering. Assess the entire roof and all applicable loads.
Does a more expensive clay tile always mean a more expensive refurbishment?
The material price alone cannot establish that. The complete scope, quantity of accessories and condition of the existing building determine the total.
Free quote
What to include in your enquiry
Tell us how you plan to use the material, the dimensions and the quantity you need. Include the thickness, grade or variant name, along with the delivery town or your preferred collection branch. For a specific product, add its name or a link to the product page. We will reply to the email address you provide to discuss availability and the terms of your order.
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