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Corrugated sheets for a shed roof

Updated: 23 October 2026

The felt has lifted along one edge and the timber feels soft, so you are looking at corrugated sheets for a shed roof. A metal skin can replace a failed cover when the frame will hold the screws. It does not replace rotten timber, and it does not answer planning for a building you have not put up yet. The packs on the [corrugated iron sheets comparison](/hub/diy-supplies/corrugated-iron-sheets) are short galvanised sheets, about 110 cm or 115 cm long, each stating 0.25 mm, with no anti-condensation fleece. Peter F. used those listings, the Planning Portal and UK maker notes. We did not re-roof a shed. A qualifying purchase can earn a commission at no extra cost to you.

The felt has lifted along one edge and the timber feels soft, so you are looking at corrugated sheets for a shed roof. A metal skin can replace a failed cover when the frame will hold the screws.

Our top picks

Harbour Housewares Harbour Housewares anthracite 14-sheet pack

Best overall

Harbour Housewares Harbour Housewares anthracite 14-sheet pack
7.4/10about £57.99
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Mondeer Mondeer dark grey 14-sheet pack

Best value

Mondeer Mondeer dark grey 14-sheet pack
7.3/10about £53.99
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Warmfay Warmfay black 24-sheet pack with screws

Alternative

Warmfay Warmfay black 24-sheet pack with screws
5.7/10about £73.99
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On this page
  1. 1.Felt that has failed
  2. 2.Over the felt or off
  3. 3.Pitch, laps and a small shed
  4. 4.Condensation
  5. 5.Planning and building regulations

Felt that has failed

Felt peels when wind gets under a loose edge. One Mondeer review says water still got into the shed after a felt replacement. If the rafters spring, or the boards are crumbly, the screw will spin. Cladco says to lay steel only where the timber is sound. A Harbour ridge is separate: five caps are said to fit 14 sheets. Thickness and laps are on the corrugated iron sheets buying guide.

Over the felt or off

Leave sound felt in place only if the boards will hold screws and the surface is flat enough for a lap to close. Cladco would rather you strip felt and battens that have already failed. A spongy patch lets the washer pull into the hole. Many older sheds used fibre-cement, including asbestos cement, rather than felt. If the covering is hard, grey and old, do not break it to check. The Health and Safety Executive treats that material as fragile. Clear nails and grit so the new sheet sits on timber. Where the screw goes on a wavy sheet is on how to fit corrugated iron sheets.
Harbour Housewares Harbour Housewares anthracite 14-sheet pack

Testsieger

Harbour Housewares Harbour Housewares anthracite 14-sheet pack
7.4/10about £57.99
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Pitch, laps and a small shed

These packs do not state a minimum pitch. Cladco’s own table puts corrugated metal at about 10° and box profile at about 4°. Do not aim a flat shed at 4° and call it allowed. Two 1.10 m sheets on a 2 m slope overlap by at least 200 mm. Fourteen sheets at 110 × 46 cm are about 7.1 m² of steel, not finished roof. A lean-to still needs a fall away from the wall.

Condensation

A cold single skin drips on a winter morning even when the outside does not leak. Onduline’s note, written for their own sheet, says single-skin roofs drip, that the problem is worse under about 15°, and that steel is more prone than their material. No fleece is stated on these packs. Ventilation is a gap at the eaves and at the ridge or the high wall, not a hole punched in the sheet. Sealing every gap can close the only air path you had. None of these listings states an insulation build-up. If you need a warm roof, this pack is the wrong product.

Planning and building regulations

Re-covering a shed you already have is not the new-outbuilding test on the Planning Portal. If the shed grows, moves, or is rebuilt, Class E in England applies. Eaves stay within 2.5 m. Overall height is 4 m for a dual pitch, 3 m otherwise, and 2.5 m within 2 m of a boundary. Other UK nations do not use that order as written. A steel skin does not by itself exempt a larger building from building regulations.

Common questions

Can metal go over felt?
Yes, if the timber under the felt is sound and the surface is flat enough for the laps to close. Cladco prefers you to strip rotten felt and battens rather than screw into them. A soft board will let the screw spin and the washer will not seal. If the old covering might be asbestos cement rather than felt, stop and get advice before you cover it or strip it.
Will steel stop the felt blowing off?
It replaces the cover. It does not tie down felt you have left loose underneath. If the felt is already lifting, strip the loose material so the sheet bears on timber. One Mondeer review says water still entered the shed after a felt replacement, so a new skin still needs laps and seal screws. The sheet does not fix a rotten frame.
Do I need planning permission to re-roof a shed?
Re-covering an existing shed is not the new-outbuilding test on the Planning Portal. Those pages set height and siting for a building you are putting up in England. Changing felt for steel on a shed that stays the same size is a different job. If you rebuild, extend, or move it, read Class E before you start. Other UK nations do not use that English order as written.
What if the new shed is near the fence?
In England, Class E as the Planning Portal summarises it limits overall height to 2.5 m when the outbuilding is within 2 m of a boundary. Eaves are 2.5 m in the general case, and a dual pitch can be 4 m overall only when it is not in that boundary zone. Flats are outside that route. Measure before you set the ridge, and do not use these English figures in Scotland as if they were the same.
Why is the inside wet if the roof does not leak?
Single-skin steel sweats. Warm air meets a cold sheet and the water drips, which Onduline describes for single-skin roofs and says is worse on steel and on pitches under about 15°. These packs do not include a fleece. High and low ventilation gives the moisture a way out. Sealing every gap can leave you with a dry lap and a wet ceiling.

Related pages

Corrugated vs box profile

Corrugated iron sheets

Best corrugated roofing sheets: shed, lean-to or skip

Corrugated iron sheets: thickness, laps and screws

How to fit corrugated iron sheets on a small shed roof

Sources

Public UK sources and the amazon.co.uk listings compared on this page. Updated 22.10.2026.

  1. Planning Portal: Outbuildings (retrieved 22.10.2026)
  2. Planning Portal: Building regulations for an outbuilding (retrieved 22.10.2026)
  3. legislation.gov.uk: Class E outbuildings (retrieved 22.10.2026)
  4. Cladco: 13/3 corrugated datasheet (retrieved 22.10.2026)
  5. Cladco: Corrugated installation guide (retrieved 22.10.2026)
  6. HSE: Fragile surfaces (retrieved 22.10.2026)
  7. HSE: Using the right type of PPE (retrieved 22.10.2026)
  8. Briarwood: 13/3 declaration (retrieved 22.10.2026)
  9. Cladco: 13/3 galvanised corrugated roofing sheets (retrieved 22.10.2026)