Map the roof and its drainage
Identify the flat-roof area, outlets, gutters, overflows, parapets, kerbs, rooflights, pipes and wall junctions. Record where water ponds and how long it remains after rain. A blocked outlet can imitate a membrane failure, while a failed upstand can let water travel under an otherwise sound surface. Ask the surveyor to show the likely route and the evidence for it.
Check the deck before choosing a system
A membrane relies on a stable and suitable deck. Soft areas, deflection or trapped moisture may require opening-up rather than another overlay. Ask what deck material is present, how its condition will be tested and which damaged sections are allowed for. The quote should state whether the deck is repaired locally or replaced throughout and what evidence would change that decision.
Understand repair and overlay limits
A local repair can suit an isolated defect when the surrounding system remains serviceable. An overlay may reduce disruption, but only when the existing build-up is compatible, dry enough and firmly attached. Ask how moisture and adhesion are assessed and how levels at doors, outlets and edges are protected. Adding another layer without solving falls or trapped water can preserve the original problem.
Compare systems by detail, not label
Felt, liquid-applied products, GRP and single-ply systems have different preparation, joint, edge and weather requirements. The choice should suit the roof shape, substrate, access and use. Ask for the complete manufacturer system and installer requirements, not just a material name. Confirm how penetrations, corners, outlets and movement are treated and what conditions can delay installation.
Coordinate insulation and condensation control
Renewal may be an opportunity or requirement to address insulation. The proposal should explain the build-up, vapour control, ventilation where relevant and continuity at edges and upstands. A thicker roof can affect thresholds, flashings and outlets. Ask for those consequences to be drawn or described before work starts. Building-control advice must match the actual work, property and thermal proposal.
Plan safe access and protect the property
Garages, extensions and dormers can be difficult to reach despite their lower height. Fragile rooflights, conservatories, narrow passages and neighbouring boundaries affect the method. Ask whether scaffold, a tower or another platform is included and how people below are protected. Material storage and hot works need their own controls. The cheapest access assumption may not be the one that can be used safely.
Define testing, finish and guarantee
Agree how outlets and finished falls are checked, what photographs are supplied and when the roof can be walked on or exposed to rain. The guarantee should identify the installed system and workmanship boundary. Ask who provides product cover and who responds to a defect. It should not imply that unrelated walls, windows or older adjoining roofs are included.
Send enough information for a useful review
Provide the full postcode, approximate roof size, use of the room below, leak timing, outlet position and previous repairs. State whether the surface is accessible and whether any contractor has already applied a coating. Safe photographs from ground level or an adjacent window can help, but do not climb onto the roof. A partner must still accept the location, service and inspection conditions.
Follow water to each outlet and upstand
A small flat roof can contain several weak points. List each outlet, wall joint, rooflight and parapet. Record where water gathers. Mark where the damp appears inside. Ask the surveyor to trace the route before choosing a membrane. Ponding needs one response. A blocked outlet needs another. A failed upstand may need a third. Similar ceiling marks do not prove the same cause.
Check the deck before choosing the finish
A new surface cannot repair a soft or wet deck. Ask how the contractor will test the base. Confirm which areas may need to be opened. The quote should explain how extra deck work is priced. Weather-resistant product claims do not prove that the base is sound. Ask what evidence supports a repair, overlay or full strip.
Measure every edge and threshold
A warm-roof build-up is often thicker than the old roof. It can reduce heights at doors and rooflights. It can also affect parapets and wall flashings. Ask for these points to be measured first. The design should show falls, outlets and safe overflow. Record any change to a visible edge. Check the exact address if that change may need official advice.
Plan for wind, rain and the room below
Roof systems have limits for wind, rain and temperature. Ask how the room stays dry during the work. Confirm what happens if the weather changes. Tools, materials and waste need a safe route too. A terrace, pavement or narrow path may alter that route. Put access and temporary cover in the quote.
Compare the awkward details
A material label does not explain the corners or outlets. It does not show how pipes and movement joints are treated. Ask for the full system at each change. Check the maker’s fitting rules. Confirm any drying, curing or welding conditions. Ask how the finished work will be checked. Compare the whole build-up and its care needs.
Send the useful facts first
Provide the postcode and rough roof size. State how the room below is used. Mark outlets and the timing of any leak. List earlier coatings. Add only safe photographs. Brighton Roofing Services reviews this information for a possible referral. A roofing partner must accept the address, access and work. Its survey should confirm the deck, falls and details before the price becomes final.
Check the scope before you decide
- Map every outlet and edge.
- Record where water gathers.
- Check the deck condition.
- Ask how moisture is tested.
- Name the full roof system.
- Check falls and upstands.
- Confirm the insulation build-up.
- Price safe access.
- Protect people below.
- Agree the weather limits.
- Record what remains excluded.
- Read the guarantee boundary.
- Keep the final documents.
Make the survey evidence usable
Ask the surveyor to label photographs by roof section and relate each recommendation to an observed condition. Record the inspection date, weather and access method. If an area could not be seen, keep that limitation beside the price rather than treating it as resolved. A useful proposal separates facts, assumptions and optional improvements. It also states what would change after opening-up and who can approve the cost. Check the business name on the quote, insurance details, payment stages and cancellation terms where applicable. Verify claimed memberships with the body that issues them. Before work begins, save the accepted version and official address checks. During the job, retain photographs of details that will be concealed. At handover, compare the finished work with the scope, collect product and workmanship documents, and record any snagging route. These records matter whether the project is a small repair or a complete roof.
Questions to take into the survey
- What evidence supports the proposed cause and extent?
- Which roof areas could not be inspected?
- What access, protection and waste costs are included?
- How are hidden defects recorded and authorised?
- What exactly does the workmanship promise cover?
- Which official permission or building-control checks apply?
Write the answers beside each quote so different assumptions remain visible during the decision.