Reroofing and repairs done bay by bay, while your production keeps running

Repair, reroof or reinforce

These are three different jobs at three different prices, and the audit tells you which one you need where.

Repair is fastener replacement, resealing laps and penetrations, new flashings and ridge caps, gutter relining, replacing a few sheets and skylights. It suits a roof whose sheet is sound and whose problems are at the joints, which is most roofs under 12 years old.

Reroof is a new sheet over the whole roof or a whole slope, either over the old sheet or in its place. It suits a roof where the coating has gone and the sheet is rusting from the top, so every repair is chasing the next hole.

Reinforce is work on the structure under the sheet: new or sistered purlins, sag rods, bracing, or extra members before a solar array goes on. It is the job people forget, and it is the one that stops a sheet job being wasted on a frame that cannot carry it.

Most reroofing jobs we quote are a mix: reinforce two bays, reroof the north slope, repair the rest, and we price them as separate lines so you can do them in the order your budget allows.

Working without stopping production

We work one bay at a time. The bay is fenced on the floor, the machines under it are covered, and the old sheet comes off and the new sheet goes on. We plan the work so that a bay opened in the morning is closed the same day, and we say in advance when a bay will stay open overnight. Hours are agreed with your plant head, including nights and Sundays where a line cannot stop.

Sudhir Yadav of Lenskart said the work at their Bhiwadi plant was done without disturbing operations. Read the Lenskart job.

We respond within 48 hours to a reroofing enquiry, and a leak over production gets a phone call the same day.

Sheet over sheet, or strip and replace

Laying new sheet over the old is quicker, keeps the building closed throughout, and leaves the old sheet as a second skin. It only works if the purlins can carry the extra weight, the old sheet is not rusting from underneath, and the roof falls and penetrations can be carried through. We check all three in the audit before offering it.

Stripping and replacing costs more and opens the building bay by bay, but it lets us see and treat the purlins, replace rotten insulation, and reset the gutter falls. Where the old roof is over 20 years old or has been patched with mixed materials, we usually recommend strip and replace.

What happens to the old sheets

Stripped sheet, purlins and gutters are usually left with you to sell as scrap. If you prefer, we can credit the scrap value on the final invoice instead. Asbestos cement sheet is different: it has to be handled and disposed of under the rules for hazardous waste. We prefer that your own contractor removes it, and we can arrange the removal where needed.

Fire-damaged sheds

After a fire the roof sheet is often the least of it: purlins have lost their temper, rafters have sagged and the frame needs an engineer's verdict before anyone goes up. In June 2026 we took on the dismantling of a fire-damaged shed directly for Elin Electronics in Ghaziabad, taking the structure down in a controlled sequence so the salvageable steel could be assessed. If your building has had a fire, call before the insurer's surveyor leaves, because the dismantling and the rebuild are cheaper planned together.

Safety on a reroofing job

Reroofing is riskier than new work, since the crew is on an old roof with fragile skylights and rusted fixings. Every fitter works clipped to a lifeline, old skylights are covered or netted before anyone walks near them, and the floor below the working bay is fenced. Installation is inside the scope of the ISO 45001:2018 certificate held by MNF Projects LLP, which is on our certifications page. We do not send a crew onto a roof without a supervisor.

We do not work to a single wind-speed number. The call depends on the wind speed and the gusts, the height and shape of the roof, the length of the sheet, the material being handled and the site itself. Long roofing sheets and lightweight materials are put down at lower wind speeds, because they catch the wind like a sail. Work also stops in rain or lightning, on a slippery roof, or whenever the site supervisor judges it unsafe. Safety comes before the programme.

What we will not do

We will not lay new sheet over a roof we have not audited. Sheet over sheet on rotten purlins looks fine for a season and then fails all at once, and we are the ones who would be back to fix it. The audit is priced separately.

How a reroofing job runs

1. AuditThe roof is scored zone by zone and the defects photographed, so the scope is based on what is there, not on what can be seen from the ground.
2. Scope and quoteRepair, reroof and reinforce priced as separate lines, bay by bay, with a programme that fits your production.
3. Survey and cutting listPurlin spacing, sheet lengths, penetrations and flashings measured on the roof. The plant rolls to the list.
4. Work bay by bayFloor fenced, machines covered, old sheet off and new sheet on in the same shift, gutters and flashings last.
5. Snag walk and passport updateWe walk the roof with you, clear the list, and update the Roof Health Passport with the new scores and the warranty.