Annual checklist. Spring: walk-around inspection, check roof felt seams, treatment touch-ups on south and west walls. Autumn: clear drainage and gutters, check anchoring before storm season, treat any cladding gaps. Total time: 6-8 hours per year. Total cost: €30-€60 in materials.
Treatment cycles for timber
The treatment cycle depends on what timber you bought.
- Entry-tier rustic timber: treat every year. Untreated cladding fades and dries dramatically in Irish weather.
- Pressure-treated timber: every 3 years for cosmetic refresh, every 5 for structural confidence. The factory treatment lasts longer than people think: overworking it doesn't help.
Products that work in Ireland:
- Cuprinol Garden Shades: opaque, colourful, 5-year fade resistance. €25 for a 2.5L tin (covers an 8×6 in two coats).
- Ronseal One Coat Shed & Fence: quick-dry, single-coat coverage. Cheap and cheerful, €18 for 5L.
- Sadolin Quick-Drying: translucent, lets the timber show through. €30 for 2.5L.
Apply in dry weather, mid-spring or early autumn. Two thin coats beats one thick coat every time. Skip annual treatment on rustic timber and you'll be replacing cladding boards in year 8 instead of repainting in year 6.
The order things fail (timber sheds)
| Year | What fails first | Fix cost (DIY) |
|---|---|---|
| 3-5 | South and west wall fade: opens cladding gaps if untreated | €20-€40 (treatment) |
| 5-7 | Roof felt cracks at seams: water ingress to roof boards | €40-€80 (re-felt) |
| 5-8 | Door hardware rust: hinges sag, padbolts seize | €20-€50 (replacements) |
| 7-10 | Floor edges absorb base moisture: front-corner rot | €30-€80 (replace boards) |
| 10-15 | Window seals harden and crack | €10-€20 (re-seal) |
None of these are dealbreakers. All of them are catchable in the spring walk-around if you actually do the spring walk-around.
Roof felt replacement: the most common job
The job most timber-shed owners eventually need to do. Sequence:
- Pick a dry day, ideally late spring.
- Lift the old felt completely. Inspect the boards underneath: soft or spongy timber means board replacement first.
- Lay new mineral felt with a 75 mm overlap on all seams, run the felt up and over the apex.
- Secure with felt nails (not staples) at 100 mm centres along the edges, 200 mm on the field.
- Seal seams with bituminous adhesive at the laps.
Materials: €40-€60 for mineral felt for an 8×6, €5 for felt nails, €8 for bituminous adhesive. Total ~€55. Job takes a few hours.
Steel sheds: different failure modes
Steel sheds need much less maintenance, but they have one specific problem: condensation. Cold steel + warm air = drips on whatever you've stored below. Mitigations:
- Eaves vents: passive airflow, fitted at order time or retrofitted with vent kits (€30-€60).
- Insulating the roof underside: bubble-wrap insulation (€60-€100 for an 8×6) cuts condensation by ~50%.
- Don't pack against the walls: leave a 50 mm gap so moisture doesn't sit between contents and steel.
Galvanised coating wear is a year-15+ issue. PVC-coated steel sidesteps it almost entirely. If you have plain galvanised and you spot rust at panel joints in year 12, hit it with a galvanised-touch-up paint (€15) before it spreads.
Anchoring check: twice a year
Once in spring after winter storms, once in autumn before the next round. Check:
- Anchor brackets between shed and base: bolts haven't worked loose
- Base hasn't cracked or shifted
- Door still closes square (frame hasn't racked)
A €5 spanner check is the cheapest insurance against losing a shed in a named storm. The Irish Met service issues storm names from autumn: if you see a Status Orange wind warning, it's worth a 5-minute check the day before.
Repairs that aren't worth doing
- Buying a new shed in year 12: usually false economy. Re-felting, re-treating and replacing one rotted floor section gets you another 8-10 years for under €200.
- Heroic structural repairs on rotten 12 mm cladding: past a certain point, replace the wall.
- Painting a steel shed for "weatherproofing": galvanised steel doesn't need it. Paint over rust at joints, yes; whole-shed paint, no.
Annual budget
For a typical domestic timber shed: €30-€60 in materials, 6-8 hours of labour, all DIY. Steel sheds: under €20 in materials, 1-2 hours labour. Skipping the schedule turns a €30 annual cost into a €300+ year-7 cost.